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Swan-Canning Estuarine Data Report

4th Quarter: June 2014 – May 2015

Looking after all our water needs

Department of Water

July 2015

Department of Water

168 St Georges Terrace

Perth Western Australia 6000

Telephone +61 8 6364 7600

Facsimile +61 8 6364 7601

www.water.wa.gov.au

© Government of Western Australia 2015

July 2015

This work is copyright. You may download, display, print and reproduce

this material in unaltered form only (retaining this notice) for your personal, non-

commercial use or use within your organisation. Apart from any use as permitted

under the Copyright Act 1968, all other rights are reserved. Requests and inquiries

concerning reproduction and rights should be addressed to the Department of Water.

Report details

This is a report prepared by the Department of Water for the Swan River Trust (now the Rivers and Estuaries Division of Department of Parks and Wildlife), Government of Western Australia.

The report should be referenced as:

Department of Water 2015. Swan-Canning Estuarine Data Report, June 2014 to May 2015. Department of Water Report for the Swan River Trust.

Acknowledgements

This project was funded by the Government of Western Australia through the Swan River Trust and the Department of Water.

For more information about this report, contact

Frances Miller (Environmental Officer),

Water Science Branch.

Swan-Canning Estuarine Data Report June 2014 – May 2015

Department of Water 3

Contents 1 Preface ................................................................................................................ 8

2 Introduction ....................................................................................................... 14

3 Key Observations from 2014-15 ........................................................................ 16

4 Total Nitrogen .................................................................................................... 26

5 Ammonium Nitrogen ......................................................................................... 30

6 Total Oxidised Nitrogen ..................................................................................... 34

7 Dissolved Organic Nitrogen............................................................................... 38

8 Total Phosphorus .............................................................................................. 42

9 Soluble Reactive Phosphorus ........................................................................... 46

10 Silica ................................................................................................................. 50

11 Dissolved Organic Carbon ................................................................................ 54

12 Total Suspended Solids .................................................................................... 58

13 Alkalinity ............................................................................................................ 60

14 Chlorophyll a ..................................................................................................... 62

15 Dissolved Oxygen ............................................................................................. 66

16 Salinity .............................................................................................................. 70

17 Temperature...................................................................................................... 74

18 pH ..................................................................................................................... 78

19 Secchi Depth ..................................................................................................... 82

20 Phytoplankton ................................................................................................... 86

Tables

Table 1 Swan and Canning Estuary site coordinates. .................................................................10

Table 2 Swan Estuary sampling regimes. ....................................................................................12

Table 3 Canning Estuary sampling regimes. ...............................................................................13

Table 4 Details of exceeded phytoplankton trigger levels in the Swan Estuary...........................17

Table 5 Table showing dissolved oxygen profiling results from sites upstream and downstream of a reported fish kill on 13 May 2015. ........................................................19

Table 6 Details of exceeded phytoplankton trigger levels in the Canning Estuary. .....................19

Table 7 Swan Total Nitrogen (TN) (mg L-1

) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. .................................................................27

Table 8 Canning Total Nitrogen (TN) (mg L-1


Table 9 Swan Ammonium Nitrogen (NH3-N) (mg L-1

) monthly sample numbers (n), minimum, maximum and median values for 2014/2015..................................................31

Table 10 Canning Ammonium Nitrogen (NH3-N) (mg L-1



4 Department of Water

Table 11 Swan Total Oxidised Nitrogen (NOx-N) (mg L-1


Table 12 Canning Total Oxidised Nitrogen (NOx-N) (mg L-1


Table 13 Swan Dissolved Organic Nitrogen (DOrgN) (mg L-1


Table 14 Canning Dissolved Organic Nitrogen (DOrgN) (mg L-1

) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. ..........................................41

Table 15 Swan Total Phosphorus (TP) (mg L-1


Table 16 Canning Total Phosphorus (TP) (mg L-1


Table 17 Swan Soluble Reactive Phosphorus (SRP) (mg L-1


Table 18 Canning Soluble Reactive Phosphorus (SRP) (mg L-1

) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. ..........................................49

Table 19 Swan Silica (soluble reactive as Silicon (SiO2-Si)) (mg L-1

) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. ...........................51

Table 20 Canning Silica (soluble reactive as Silicon (SiO2-Si)) (mg L-1

) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. ...........................53

Table 21 Swan Dissolved Organic Carbon (DOC) (mg L-1


Table 22 Canning Dissolved Organic Carbon (DOC) (mg L-1


Table 23 Swan Total Suspended Solids (TSS) (mg L-1


Table 24 Swan Alkalinity (tot) (CaCO3) (mg L

-1) monthly sample numbers (n), minimum,

maximum and median values for 2014/2015. .................................................................61

Table 25 Swan Chlorophyll a (Chl a) (µg L-1


Table 26 Canning Chlorophyll a (Chl a) (µg L-1


Table 27 Swan Dissolved Oxygen (DO) (mg L-1

) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015..................................................68

Table 28 Canning Dissolved Oxygen (DO) (mg L-1) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015..................................................69

Table 29 Swan Salinity (ppt) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. ..................................................................................72

Table 30 Canning Salinity (ppt) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. ..................................................................................73

Table 31 Swan Temperature (°C) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. .................................................................76

Table 32 Canning Temperature (°C) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. .................................................................77

Table 33 Swan pH (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. ......................................................................................................80

Table 34 Canning pH (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. .........................................................................................81

Table 35 Swan Secchi Disc depth (m) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. ..................................................................................83

Table 36 Canning Secchi Disc depth (m) monthly sample numbers (n), minimum, maximum and median values for 2014/2015. .................................................................85



Figures

Figure 1 Map of Swan and Canning routine estuarine monitoring sites within the ecological management zones. ........................................................................................................11

Figure 2 Monthly rainfall for 2014-15 compared with the 40 year averages (1974-2014) ............16

Figure 3 Swan River integrated Phytoplankton group densities June 2014-May 2015 ................21

Figure 4 Swan River integrated Phytoplankton group densities June 2013-May 2014 ................22

Figure 5 Canning River estuary integrated phytoplankton group densities Jun 2014 - May 2015 .................................................................................................................................23

Figure 6 Canning River estuary integrated phytoplankton group densities Jun 2013 - May 2014 .................................................................................................................................24

Figure 7 Canning River Profile for 12 May 2015 ...........................................................................25

Figure 8 Canning River Profile for 19 May 2015 ...........................................................................25

Figure 9 2014/2015 Total Nitrogen (TN) (mg L-1

) in surface and bottom water, over background (June 2009-May 2014) TN data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ...............................................................................................26


) in surface and bottom water, over background (June 2009-May 2014) TN data, in the Canning Estuary and Lower Canning River. .................................................................................................................28

Figure 11 2014/2015 Ammonium Nitrogen (NH3-N) (mg L-1

) in surface and bottom water, over background (June 2009-May 2014) NH3-N data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................30


) in surface and bottom water, over background (June 2009-May 2014) NH3-N data, in the Canning Estuary and Lower Canning River. ......................................................................................................32

Figure 13 2014/2015 Total Oxidised Nitrogen (NOx-N) (mg L-1

) in surface and bottom water, over background (June 2009-May 2014) NOx-N data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................34


) in surface and bottom water, over background (June 2009-May 2014) NOx-N data, in the Canning Estuary and Lower Canning River. ......................................................................................................36

Figure 15 2014/2015 Dissolved Organic Nitrogen (DOrgN) (mg L-1

) in surface and bottom water, over background (July 2009-May2014) DOrgN data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................38


) in surface and bottom water, over background (July 2009-May 2014) DOrgN data, in the Canning Estuary and Lower Canning River...................................................................................40

Figure 17 2013/2014 Total Phosphorus (TP) (mg L-1

) in surface and bottom water, over background (June 2008-May 2013) TP data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ...............................................................................................42


) in surface and bottom water, over background (June 2009-May 2014) TP data, in the Canning Estuary and Lower Canning River. .................................................................................................................44

Figure 19 2014/2015 Soluble Reactive Phosphorus (SRP) (mg L-1

) in surface and bottom water, over background (June 2009-May 2014) SRP data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................46


) in surface and bottom water, over background (June 2009-May 2014) SRP data, in the Canning Estuary and Lower Canning River. ...............................................................................................48

Figure 21 2014/2015 Silica (soluble reactive as Silicon (SiO2-Si)) (mg L-1

) in surface and bottom water, over background (July 2009-May 2014) SiO2-Si data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ..........................................................50


) in surface water, over background (July 2009-May 2014) SiO2-Si data, in the Canning Estuary and Lower Canning River. ......................................................................................................52



Figure 23 2014/2015 Dissolved Organic Carbon (DOC) (mg L-1

) in surface water, over background (June 2009-May 2014) DOC data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................................54


) in surface water, over background (June 2009-May 2014) DOC data, in the Canning Estuary and Lower Canning River. .................................................................................................................56

Figure 25 2014/2015 Total Suspended Solids (TSS) (mg L-1

) in surface water, over background (June 2009-May 2014) TSS data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................................58

Figure 26 2014/2015 Alkalinity (tot) (CaCO3) (mg L

-1) in surface water, over background

(June 2009-May 2014) Alkalinity data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ......................................................................................................60

Figure 27 2014/2015 Chlorophyll a (Chl a) (µg L-1

) in surface and integrated water, over background (June 2009-May 2014) Chl a data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................................62


) in surface and integrated water, over background (June 2009-May 2014) Chl a data, in the Canning Estuary and Lower Canning River. .................................................................................................................64

Figure 29 2014/2015 Dissolved Oxygen (DO) (mg L-1

) (in situ) in surface and bottom water, over background (July 2009-May 2014) DO data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................................66


) (in situ) in surface and bottom water, over background (July 2009-May 2014) DO data, in the Swan River. ............................67


) (in situ) in surface and bottom water, over background (June 2009-May 2014) DO data, in the Canning Estuary and Lower Canning River. ......................................................................................................67

Figure 32 2014/2015 Salinity (ppt) (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ......................................................................................................70

Figure 33 2014/2015 Salinity (ppt) (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Swan River...................................................71

Figure 34 2014/2015 Salinity (ppt) (in situ) in surface and bottom water, over background (June 2009-May 2014) DO data, in the Canning Estuary and Lower Canning River. ...............................................................................................................................71

Figure 35 2014/2015 Temperature (°C) (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ....................................................................................74

Figure 36 2014/2015 Temperature (°C) (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Swan River. ..............................75

Figure 37 2014/2015 Temperature (°C) (in situ) in surface and bottom water, over background (June 2009-May 2014) DO data, in the Canning Estuary and Lower Canning River. .................................................................................................................75

Figure 38 2014/2015 pH (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Lower Swan Canning, Middle and Upper Swan Estuary. ...........................................................................................................................78

Figure 39 2014/2015 pH (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Swan River. ...................................................................79

Figure 40 2014/2015 pH (in situ) in surface and bottom water, over background (June 2009-May 2014) DO data, in the Canning Estuary and Lower Canning River. .......................79

Figure 41 2014/2015 Secchi Disc depth (m) over background (June 2009-May 2014) Secchi Disc depth data, in the Lower Swan Canning, Middle, Upper Swan Estuary and the Swan River. ...............................................................................................................82

Figure 42 2014/2015 Secchi Disc depth (m) over background (June 2009-May 2014) Secchi Disc depth data, in the Canning Estuary and Lower Canning River. ..............................84

Figure 43 Swan 2009 integrated Phytoplankton (cells/mL). ............................................................86



Figure 44 Swan June 2009-May 2010 integrated Phytoplankton (cells/mL). ..................................87




Figure 48 Swan June 2013-May2014 integrated Phytoplankton (cells/mL). ...................................91

Figure 49 Swan June 2014-May2015 integrated Phytoplankton (cells/mL). ...................................92

Figure 50 Canning 2009 integrated Phytoplankton (cells/mL). .......................................................93

Figure 51 Canning June 2009-May 2010 integrated Phytoplankton (cells/mL). .............................94








1 Preface

The Swan Canning Environmental Monitoring and Reporting project is a long term

monitoring project consisting of regular sampling of the Swan and Canning Rivers

and the Swan Canning catchment, enabling regular water quality reporting and

annual reporting on estuarine and catchment compliance. The project was designed

and implemented in 1994 by the Swan River Trust and Department of Water (then

Water and Rivers Commission) as part of the Swan Canning Clean-up Program

Action Plan. The project is currently delivered through the Swan River Trust Healthy

Rivers Action Plan and is jointly operated by the Water Science Branch of the

Department of Water and the Swan River Trust.

The estuarine water sampling conducted for this monitoring project falls under

several Department of Water WIN data management projects. These are:

SG-E-SWANEST – Swan River Estuary Sampling. This project consists of weekly

sampling at twenty-four fixed sites (11 grab sample sites) from Blackwall Reach

upstream to Power Line crossing in West Swan. This sampling is generally

conducted every Monday, split into the lower Swan run, using the Swan River Trust

boat Kwilana, and the upper Swan run, using the Trailcraft. For the ten lower Swan

sites, sampling began October 1994 but was somewhat intermittent until 1999. For

the upper Swan sites, sampling began November 2006.

SG-E-CANEST – Canning River Estuary Sampling. This project consists of weekly

sampling at eight fixed sites from South Canning Bridge upstream to Ellison Parade

in Langford. This sampling is generally conducted every Tuesday and is split into two

separate runs using two Swan River Trust boats, the Trekker and the Trailcraft.

Sampling began January 1995 but was somewhat intermittent until 1999.

SG-E-UPPERSWAN – Upper Swan River Estuary Sampling. This project was closed

and the sites were added to the SG-E-SWANEST project from July 2010.

SG-E-SWANCOMP – Swan River Compliance Sampling. This project consists of

weekly sampling at an additional site from the first week of January to last week of

May. The compliance site each week is located at a randomly selected sampling

point on a grid of Melville waters. This sampling is incorporated into the regular

weekly SWANEST sampling run. Sampling began in 1999. A report of the

compliance data is produced annually at the end of June.



Some important estuarine sampling changes are listed below:

In November 2014 the ecological management zones within the Swan Canning River Estuary were re-classified to align this report with others published by SRT and DOW. Please refer to Page 14 of this report for current ecological zone classifications. It should therefore be noted that the monitoring sites within each zone have changed with respect to quarterly data reports published before November 2014.

CAS site sampled 23/1/1995 to 23/6/1998, and then re-added to CANEST 1/11/2005. Location changed to mid-channel (CASMID) 19/01/2010. Location changed back to CAS from 27/11/2012. Location changed back to CASMID from 19/03/2013.

CANEST sampling was split into two runs on the 19/03/13. The lower Canning sites (SCB2, SAL, RIV and CASMID) were sampled from the Trekker and the upper Canning sites (KEN, BAC, NIC and ELL) were sampled from the Trailcraft.

On the 22/07/14 due to access issues the run was altered so that SCB2, SAL, KEN and BAC are sampled using the Trailcraft and RIV, CASMID, NIC and ELL are sampled using the Trekker.

Sampling at SCB moved 100 m west to SCB2 on 29/01/2013.

Ceased profiling SCS01, LLH and WBRP on the SWAN. Last profiled on 28/05/2012.

New site South Canning Bridge (SCB) added to CANEST project July 2010.

Grab samples changed from weekly to fortnightly in July 2010.

Changed from bottom grab samples to integrated samples for chlorophyll on 10/12/2001 for SWANEST and 25/10/2005 for CANEST.

HEA site added to SWANEST 9/10/2000.

Silica and Dissolved organic nitrogen sampled from 14/7/2008 for SWANEST and CANEST and from 8/9/2008 for UPPERSWAN.

Changed analytical laboratory from SGS to NMI from 5/9/2005 for chlorophyll and from 19/9/2005 for all other parameters.



Table 1 Swan and Canning Estuary site coordinates.

Project Site Site Code Easting Northing Expected Depth (m)

SW

AN

ES

T

Blackwall Reach BLA 385081 6456807 16 - 17

Armstrong Spit ARM 387504 6458161 12 - 13

Heathcote HEA 389983 6459538 6 – 8

Narrows Bridge NAR 391215 6463014 5 – 6

Nile Street NIL 394660 6464027 2 – 3

St John’s Hospital STJ 397308 6464439 5 – 6

Maylands Pool MAY 396801 6465716 3 – 4

Ron Courtney Island RON 399802 6467786 4 – 5

Kingsley KIN 401768 6468783 5 – 6

Success Hill SUC 401585 6470349 4 – 5

West Midland Pool WMP 404439 6471549 4 – 4.8

Middle Swan Bridge MSB 406263 6474166 2 – 3

Jane Brook confluence JBC 405656 6474493 2 – 2.5

Power line crossing POL 404979 6475053 1.5 – 2.5

CA

NE

ST

South Canning Bridge SCB2 391698 6457081 3.5 – 5

Salter Point SAL 393509 6455593 ~2

Riverton Bridge RIV 396239 6455988 ~1.5

Castledare CASMID 397599 6456555 2 – 2.5

Kent Street Weir KEN 398104 6456676 2 – 3

Bacon Street BAC 398652 6456567 5 – 6

Nicholson Rd Bridge NIC 400108 6455782 3 – 4

Ellison Parade ELL 401012 6455148 2 – 3

Figure 1 Map of Swan and Canning routine estuarine monitoring sites within the ecological management zones.



Table 2 Swan Estuary sampling regimes.

Project Site

Code

Frequency

Weekly or

Fortnightly

TN TP NOx NH3 SRP DOrgN SiO2 DOC TSS Alk Chl YSI

profile

in situ

Field

obs and

secchi

Phyto-

plankton

S B S B S B S B S B S B S B S S S S ID ID NET

SW

AN

ES

T

BLA W/F

ARM W/F

HEA W

NAR W/F

NIL W/F #

#

#

STJ W/F #

#

#

MAY W/F #

#

#

RON W/F #

#

#

KIN W/F #

#

#

SUC W/F #

#

#

WMP W/F

MSB W/F

JBC W

POL W

# Surface TN, TP and Chlorophyll sampled weekly at two of these sites (randomly selected) January to May for compliance calculations for estuarine Swan

River Trust KPI's.



Table 3 Canning Estuary sampling regimes.

Project Site Code

Frequency

Weekly or

Fortnightly

TN TP NOx NH3 SRP DOrgN SiO2 DOC TSS Alk Chl YSI

profile

in situ

Field

obs and

secchi

Phyto-

plankton

S B S B S B S B S B S B S B S S S S ID ID NET

CA

NE

ST

SCB2 W/F

SAL W/F

RIV W/F #

#

#

CASMID W/F

KEN W/F

BAC W/F

NIC W/F

ELL W/F

# Surface TN, TP and Chlorophyll sampled weekly at this site January to May for compliance calculations for estuarine Swan River Trust KPI's.

S = surface

B = bottom

ID = integrated

YSI profile includes dissolved oxygen, temperature, conductivity and pH.



2 Introduction

This Swan Canning estuarine quarterly data report presents background and current

quarter data collected from a total of twenty two sites from the Swan and Canning

Estuarine Environmental Monitoring program. Data is presented in graphical and

tabular form for thirteen key analytes; total nitrogen, ammonium nitrogen, total

oxidised nitrogen, dissolved organic nitrogen, total phosphorus, soluble reactive

phosphorus, silica, dissolved organic carbon, total suspended solids, alkalinity,

chlorophyll a, secchi depth, and phytoplankton, and four in situ profile data

parameters; dissolved oxygen, salinity, temperature and pH.

Data (except phytoplankton data) from the twenty two sites is grouped into five

regions as follows;

Lower Swan Canning Estuary: BLA, ARM, HEA and NAR

Middle Swan Estuary: NIL, STJ, MAY and RON

Upper Swan Estuary: KIN, SUC, WMP and MSB

Swan River: JBC and POL

Canning Estuary: SCB2, SAL, RIV and CASMID

Lower Canning River: KEN, BAC, NIC and ELL

Graphical presentation of each analyte (except phytoplankton) and in situ parameter

includes background monthly median, 10th and 90th percentile data overlain by the

monthly medians of the current year. Estuarine data is presented over a June to May

year so that the usual summer/autumn period of interest is kept together in one

report and is still current for the final 4th quarter report. Quarterly reports correspond

to 1st quarter (Jun-Aug), 2nd quarter (Sep-Nov), 3rd quarter (Dec-Feb) and 4th quarter

(Mar-May) with the data from each quarterly report adding to the “current year” data

already presented.

This data report is the fourth quarterly report for 2014-15 and presents data from

June 2014 to May 2015 over background data generally from June 2009 to May

2014. Dates of background data vary for some analytes due to sampling changes

(see Preface). All data recorded below the laboratory limit of reporting was halved in

order to be presented graphically.

The current year data (2014-15) is also presented in tables showing the number of

samples collected for each analyte (n), the monthly minimum and maximum values

and the monthly median for the current quarter.



Phytoplankton data is presented as yearly contour plots for total phytoplankton,

diatoms, dinoflagellates and chlorophytes for the Swan (11 sites) and Canning (8

sites) for 2009 to 2014-15. Weekly phytoplankton data from integrated water column

samples is presented with no temporal or spatial grouping of the data.

Data presented and discussed in the section titled, Key Observations from 2014-15, compares current year data (2014-15) to data from the previous year (2013-14).



3 Key Observations from 2014-15 The total rainfall for 2014-15 was 646 mm. This is below the average annual rainfall recorded at Perth airport over the past 40 years (721 mm). The seasonal pattern was similar to the historical patterns of high rainfall during winter months and low rainfall during summer months (Figure 2). Compared to the 40 year average, rainfall during the 2014-15 reporting period was lower than the 40 year average throughout most of the year except from February to April.

Figure 2 Monthly rainfall for 2014-15 compared with the 40 year averages (1974-2014)

Swan River Phytoplankton

Overall, total phytoplankton activity in the Swan River for 2014-15 (Figure 3) was higher compared to 2013-14 (Figure 4). This year (2014-15) peak cell densities occurred during winter (July to August) and mid-summer to early autumn (January to March). This differs from last year (2013-14) when peak cell densities occurred during the end of winter and the start of spring (July to September).

Diatom occurrence followed a similar pattern to last year and were present throughout most of the year (Figure 3). This year diatoms appear to be present in higher abundances than 2013-14 (Figure 4). Cylindrotheca closterium and Cyclotella spp. were the dominant species. Cylindrotheca closterium abundance peaked in the upper Swan during early winter (July). Cyclotella spp. abundance peaked in the upper Swan in mid to late winter (July to August) and in the middle to upper Swan in mid-summer (January) and early Autumn (March).

Dinoflagellate activity appeared to be reduced this year (Figure 3) compared to 2013-14 (Figure 4). Cell densities were highest through mid-spring to early summer (October to December) in the lower to middle Swan. The dominant species were Prorocentrum minimum during early October, Heterocapsa minimum during mid to late October and Scrippsiella spp. and Skeletonema spp. in December.

0

20

40

60

80

100

120

140

160

180

Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May

Rai

nfa

ll (m

m)

2014-15 40 year Average



Chlorophyte activity throughout the year was once again predominantly Prasinophyte spp. This year Chlorophytes were present from mid-spring to the end of autumn (October to May). Chlorophyte activity occurred throughout the River and Estuary.

No fish kill events associated with the Swan were reported for the period of June 2014 to May 2015.

During the 2014-15 period, phytoplankton response values for harmful and nuisance phytoplankton species were triggered at several sites in the Swan Estuary. Details of where and when these trigger values were exceeded are presented in Table 4.

Table 4 Details of exceeded phytoplankton trigger levels in the Swan Estuary.

Site(s) Harmful/Nuisance Species

(max cell count) Status/Species Trigger

Level (cells/mL)*#

Duration of Event (Dates Sampled)

MSB

Cylindrotheca clostrium (Harmless Diatom)

91,506 cells/mL

Investigation (50,000) 1 week

3/6/2014

BLA-NIL

Dinophysis acuminata (Potentially DSP producing Dinoflagellate)

5-24 cells/mL

Notification (10) 3 weeks

15/9/2014 – 30/9/2014

NAR


5 cells/mL

Investigation (5) 1 week

20/10/2014

RON

Gymnodinium / Karenia Complex (GKC)

(Potentially neurotoxic dinoflagellates)

538 cells/mL


15/12/2014

* Species trigger values are set by the Swan River Trust in consultation with the Departments of Water and Health and are reviewed annually. The trigger values are intended to inform management actions for the Swan Canning river system. Phytoplankton cell densities are determined from depth-integrated samples.

# The investigation and notification trigger value for Dinophysis acuminata were reduced from 10 and

20 to 5 and 10 respectively in September 2014.

Swan River Total Nitrogen (TN) and Total Phosphorus (TP)

The monthly median total nitrogen results for 2014-15 followed similar patterns to the monthly background median values (Figure 9). Although the trend was similar for all ecological zones, the peak in total nitrogen occurred in July, compared to August peaks respectively in the median background data. In the lower Swan Canning Estuary surface water, peak total nitrogen concentrations occurred in August. All median total nitrogen data for 2014-15 was within the 10th to 90th percentile boundaries except for during May in the middle Swan Estuary surface water and the upper Swan Estuary bottom water which was below the 10th percentile boundary. Median monthly total nitrogen concentrations were also below the 10th percentile boundary in the upper Swan Estuary surface water during April and May. For the 2014-15 period, monthly rainfall peaked in July (Figure 2).



The monthly median total phosphorus results for 2014-15 followed similar patterns to the monthly background median values (Figure 17). With the exception of the lower Swan Canning Estuary all monthly median total phosphorus data for 2014-15 fell within the 10th to 90th percentile boundary. Median monthly total phosphorous concentrations peaked in February in the lower Swan Canning Estuary and January in the upper Swan Estuary. In the middle Swan Estuary median monthly total phosphorus concentrations peaked in January and November for surface and bottom water respectively (Figure 17).

Canning River Phytoplankton

The Kent St Weir was opened on 24 July 2014 and closed on 9 October 2014.

Overall, total phytoplankton activity in the Canning River appeared similar for 2014-15 (Figure 5) compared to 2013-14 (Figure 6).

Diatom densities increased from the end of winter to mid-spring (August to November) between South Canning Bridge and Salters Point. The active species was Skeletonema costatum. From the end of spring to mid-autumn (November to April) the dominant diatom upstream of Kent Street Weir was Cyclotella spp. Below Kent Street Weir during summer and autumn (December to May) the dominant species were Cyclotella spp. and Skeletonema spp.

In early winter (June) the dominant dinoflagellate was Prorocentrum dentatum which was measured between SCB2 and CASMID. From mid-spring to early summer (October to December) the dominant species was Gymnodinium spp. which was also seen between SCB2 and CASMID.

Chlorophyte activity occurred from the end of spring until the end of autumn (November to May). The dominant species throughout, above and below the Kent Street Weir, were Prasinophyte spp. with some Oocystis spp. activity above the weir in January.

One fish kill event was reported relating to the Canning River for the period of June 2014 to May 2015. On 13 May 2015 approximately 50 dead Black Bream were observed at the bottom of the river around Bywater Way, Wilson. Trust staff subsequently investigated, finding an estimated 1,000-5,000 dead Black Bream scattered along a section of approximately 1km of the Canning River, downstream of Kent Street Weir. The contour plots for salinity, oxygen and water temperature during the regular sampling events the day before and one week after the fish kill event can be seen in Figure 7 and Figure 8 respectively. The contour plots for the day before the fish kill event show an area of low oxygen bottom water at Riverton Bridge (RIV) downstream from Bywater Park and an area of low oxygen to hypoxic bottom water upstream at the Castledare site (CASMID). Surface water was oxygenated at both sites (RIV = 5.7 mg/L and CASMID = 4.6 mg/L). The week after the event the water at Castledare (CASMID) was well oxygenated throughout and the water at Riverton Bridge (RIV) measured well oxygenated at the surface and low oxygen at the bottom.

Hypoxic conditions were recorded between Castledare and Kent St on the day of the

fish kill (see Table 5) . Karlodinium was present (maximum 3552 cell/mL on 7 May

2015) but not at densities that would be thought to cause issue. Pathology in three

black bream submitted indicated there had been a prior chronic inflammatory



condition. This suggests the bream were not in good health before the fish kill event.

Subsequently an investigation of further black bream was undertaken.

Table 5 Table showing dissolved oxygen profiling results from sites upstream and downstream of a

reported fish kill on 13 May 2015.

DO (mg/L)

Depth (m)

Kent St downstream

50m CASMID

Bywater Park

Confluence A

RIV

0.2 3.05 3.82 3.91 5.73 6.65

0.5 0.65 3.22 3.68 5.00 7.40

1.0 0.44 2.87 3.80 3.70 7.63

1.5 0.34 1.99 4.07 2.50 7.54

2.0 0.23 0.90 3.66 - -

2.5 0.23 - - - -

During the 2014-15 period, phytoplankton response values were triggered at several sites in the Canning Estuary. Details of where and when these trigger values were exceeded are presented in Table 6.

Table 6 Details of exceeded phytoplankton trigger levels in the Canning Estuary.

Site(s) Harmful/Nuisance Species

(max cell count) Status/Species Trigger

Level (cells/mL)*#

Duration of Event (Dates Sampled)

SAL and

SCB2


10 cells/mL


12/8/2014

SAL and

SCB2


11-20 cells/mL

Notification (10) 2 weeks

16/9/2014 - 23/9/2014

RIV

Heterosigma akashiwo

(Potentially ichthyotoxic Raphidophyte)

60,346 cells/mL

Notification (40,000) 1 week

4/11/2014

RIV

Heterosigma akashiwo

(Potentially ichthyotoxic Raphidophyte)

31,967 cells/mL

Investigation (20,000) 1 week

2/12/2014

* Species trigger values are set by the Swan River Trust in consultation with the Departments of Water and Health and are reviewed annually. The trigger values are intended to inform management actions for the Swan Canning river system. Phytoplankton cell densities are determined from depth-integrated samples.



# The investigation and notification trigger value for Dinophysis acuminata were reduced from 10 and

20 to 5 and 10 respectively in September 2014.

Canning River Total Nitrogen (TN) and Total Phosphorus (TP)

Monthly median total nitrogen concentrations for 2014-15 followed similar trends to the median monthly background data (Figure 10). All monthly median total nitrogen concentrations fell within the 10th and 90th percentile boundaries. Monthly median total nitrogen concentrations peaked in July in the Canning Estuary surface water and the lower Canning River, and in August for the Canning Estuary bottom water (Figure 10).

Monthly median total phosphorus concentrations for 2014-15 followed similar trends to the median monthly background data (Figure 18). With the exception of April in the lower Canning River bottom water, all monthly median total phosphorus concentrations fell within the 10th and 90th percentile boundaries (Figure 18).

Monthly TN and TP medians for the bottom waters of the lower Canning River were below background median levels for the period December to April (Figures 10 and 18). This coincided with the expansion and improved operation of oxygenation infrastructure, resulting in increased oxygen concentrations within that ecological management zone (Figure 31).



Figure 3 Swan River integrated Phytoplankton group densities June 2014-May 2015



Figure 4 Swan River integrated Phytoplankton group densities June 2013-May 2014



Figure 5 Canning River estuary integrated phytoplankton group densities Jun 2014 - May 2015



Figure 6 Canning River estuary integrated phytoplankton group densities Jun 2013 - May 2014



Figure 7 Canning River Profile for 12 May 2015

Figure 8 Canning River Profile for 19 May 2015

-6

-4

-2

0

0 10 20 30 40

Salinity (ppt)

-6

-4

-2

0

0 5 10 15

Dissolved Oxygen (mg/L)

-6

-4

-2

0

0 50 100 150 200Dissolved Oxygen (%Sat'n)

0 2 4 6 8 10 12 14 16

-6

-4

-2

0

10 15 20 25 30

Temperature (°C)

Canning River Estuary - Physical-chemical Profile - 12th May 2015

Distance from Canning Bridge (km)

De

pth

(m

)

SCB2 SAL RIV CASMID KEN BAC GRE NIC ELL



4 Total Nitrogen


) in surface and bottom water, over background (June 2009-May 2014) TN data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) TN Upper Swan Estuary (Surface)


TN

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

(b) TN Lower Swan Canning Estuary (Bottom)


TN

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

(c) TN Middle Swan Estuary (Surface)


TN

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

(d) TN Middle Swan Estuary (Bottom)


TN

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

(a) TN Lower Swan Canning Estuary (Surface)


TN

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Monthly background 10th & 90th percentile

Monthly background Median

14/15 monthly Median

(f) TN Upper Swan Estuary (Bottom)


TN

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

2.5

3.0






Table 7 Swan Total Nitrogen (TN) (mg L-1

) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


TN Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 0.24 0.29 0.48 0.22 0.28 0.22 0.20 0.18 0.25 0.19 0.21 0.11

max 0.75 1.00 0.86 0.64 0.58 0.43 0.43 0.33 0.38 0.40 0.36 0.35

median 0.39 0.52 0.60 0.40 0.35 0.29 0.28 0.21 0.31 0.26 0.27 0.26

TN Lower Swan Canning Estuary (Bottom)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 0.18 0.16 0.17 0.16 0.19 0.15 0.14 0.14 0.22 0.18 0.19 0.18

max 0.39 0.50 0.67 0.46 0.37 0.35 0.38 0.33 0.37 0.37 0.36 0.27

median 0.22 0.32 0.29 0.22 0.22 0.23 0.22 0.18 0.29 0.25 0.27 0.24

TN Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.61 0.97 0.93 0.75 0.67 0.58 0.48 0.39 0.46 0.55 0.41 0.37

max 1.20 1.50 1.10 1.10 0.97 1.00 1.30 0.84 0.79 0.85 0.73 0.73

median 0.93 1.30 1.10 0.95 0.85 0.78 0.65 0.59 0.67 0.64 0.65 0.44

TN Middle Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.40 0.63 0.60 0.50 0.47 0.41 0.43 0.36 0.52 0.48 0.36 0.30

max 0.89 1.50 1.20 1.10 1.20 0.91 1.00 0.65 0.72 0.78 0.66 0.57

median 0.53 0.95 0.91 0.87 0.72 0.65 0.56 0.49 0.60 0.59 0.51 0.42

TN Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 1.10 1.10 1.00 0.88 0.84 0.87 0.77 0.89 0.78 0.76 0.68 0.56

max 1.60 1.60 1.10 1.10 0.95 1.10 1.60 1.10 0.92 0.99 0.96 0.82

median 1.20 1.35 1.10 0.97 0.90 0.96 1.03 1.00 0.87 0.91 0.82 0.70

TN Upper Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.85 1.10 1.10 0.87 0.90 0.83 0.76 0.69 0.66 0.68 0.68 0.47

max 1.40 1.70 1.10 0.99 1.00 0.99 1.10 1.00 0.88 0.90 0.85 0.75

median 1.10 1.40 1.10 0.97 0.95 0.93 0.93 0.85 0.82 0.83 0.78 0.62




) in surface and bottom water, over background (June 2009-May 2014) TN data, in the Canning Estuary and Lower Canning River.

(a) TN Canning Estuary (Surface)


TN

(m

g L

-1)

0

1

2

3

4

5

6

(b) TN Canning Estuary (Bottom)


TN

(m

g L

-1)

0

1

2

3

4

5

6

(c) TN Lower Canning River (Surface)


TN

(m

g L

-1)

0

1

2

3

4

5

6

(d) TN Lower Canning River (Bottom)


TN

(m

g L

-1)

0

1

2

3

4

5

6









Table 8 Canning Total Nitrogen (TN) (mg L-1



TN Canning Estuary (Surface)

n 8 12 8 8 8 7 9 8 7 7 8 8

min 0.32 0.58 0.65 0.47 0.35 0.34 0.30 0.31 0.31 0.33 0.33 0.38

max 1.00 1.40 1.40 1.10 1.10 1.40 0.88 1.50 1.30 1.40 1.40 0.99

median 0.60 0.99 0.92 0.96 0.81 0.50 0.50 0.63 0.64 0.67 0.60 0.52

TN Canning Estuary (Bottom)

n 8 12 8 8 8 8 9 8 7 7 8 8

min 0.26 0.42 0.46 0.32 0.23 0.28 0.29 0.31 0.31 0.29 0.28 0.30

max 0.95 1.40 1.20 1.10 1.00 1.30 1.20 1.50 1.30 0.87 0.77 0.98

median 0.49 0.70 1.01 0.95 0.59 0.71 0.48 0.64 0.50 0.53 0.47 0.50

TN Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.91 1.30 1.20 0.98 0.91 0.79 0.50 0.39 0.61 0.50 0.53 0.68

max 1.20 1.60 1.50 1.10 1.10 1.00 0.81 0.92 1.10 1.60 0.72 1.20

median 0.99 1.50 1.35 1.05 0.97 0.85 0.74 0.69 0.81 0.70 0.61 0.98

TN Lower Canning River (Bottom)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.85 1.30 1.20 0.97 0.87 0.79 0.61 0.48 0.58 0.48 0.34 0.56

max 1.30 1.70 1.50 1.20 1.10 1.20 1.20 1.10 0.95 1.40 0.84 1.20

median 1.00 1.50 1.35 1.05 0.98 1.00 0.72 0.72 0.78 0.78 0.66 0.98



5 Ammonium Nitrogen


) in surface and bottom water, over background (June 2009-May 2014) NH3-N data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) NH3-N Upper Swan Estuary (Surface)


NH

3-N

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

(f) NH3-N Upper Swan Estuary (Bottom)


NH

3-N

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

(b) NH3-N Lower Swan Canning Estuary (Bottom)


NH

3-N

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

(c) NH3-N Middle Swan Estuary (Surface)


NH

3-N

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

(d) NH3-N Middle Swan Estuary (Bottom)


NH

3-N

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

(a) NH3-N Lower Swan Canning Estuary (Surface)


NH

3-N

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

0.5

0.6









Table 9 Swan Ammonium Nitrogen (NH3-N) (mg L-1



NH3-N Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min <0.010 0.013 <0.010 0.011 0.012 <0.010 <0.010 <0.010 <0.010 0.011 <0.010 <0.010

max 0.084 0.060 <0.010 0.066 0.034 0.010 0.017 0.026 0.011 0.028 0.026 0.039

median 0.015 0.031 <0.010 0.020 0.019 <0.010 <0.010 0.011 <0.010 0.022 0.017 0.021

NH3-N Lower Swan Canning Estuary (Bottom)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 0.010 0.017 <0.010 0.041 0.041 <0.010 <0.010 <0.010 <0.010 0.016 0.010 <0.010

max 0.078 0.150 0.150 0.110 0.092 0.044 0.046 0.035 0.021 0.036 0.026 0.038

median 0.036 0.067 0.052 0.068 0.064 0.014 0.016 0.019 0.013 0.024 0.014 0.029

NH3-N Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.015 <0.010 0.020 0.062 0.018 <0.010 <0.010 <0.010 <0.010 0.010 <0.010 0.033

max 0.180 0.089 0.095 0.140 0.120 0.021 0.021 0.027 0.050 0.140 0.093 0.090

median 0.069 0.070 0.074 0.110 0.038 0.011 0.011 0.015 0.011 0.033 0.031 0.057

NH3-N Middle Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.042 0.083 0.049 0.100 0.087 <0.010 <0.010 0.011 0.012 0.022 0.026 0.042

max 0.490 0.420 0.580 0.530 0.590 0.099 0.300 0.053 0.044 0.140 0.130 0.100

median 0.165 0.190 0.225 0.180 0.235 0.019 0.018 0.028 0.022 0.050 0.072 0.063

NH3-N Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min <0.010 0.028 0.019 0.041 0.016 0.011 <0.010 <0.010 0.010 0.010 0.019 <0.010

max 0.270 0.072 0.076 0.140 0.110 0.080 0.052 0.045 0.058 0.081 0.100 0.150

median 0.058 0.049 0.050 0.057 0.085 0.014 0.014 0.012 0.015 0.048 0.076 0.093

NH3-N Upper Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min <0.010 0.028 0.018 0.041 0.058 0.012 0.011 0.018 0.022 0.033 0.030 <0.010

max 0.590 0.074 0.160 0.120 0.200 0.080 0.120 0.200 0.084 0.110 0.130 0.150

median 0.305 0.047 0.053 0.061 0.115 0.024 0.034 0.042 0.043 0.062 0.096 0.097




) in surface and bottom water, over background (June 2009-May 2014) NH3-N data, in the Canning Estuary and Lower Canning River.

(a) NH3-N Canning Estuary (Surface)


NH

3-N

(m

g L

-1)

0

1

2

3

(b) NH3-N Canning Estuary (Bottom)


NH

3-N

(m

g L

-1)

0

1

2

3

(c) NH3-N Lower Canning River (Surface)


NH

3-N

(m

g L

-1)

0

1

2

3

(d) NH3-N Lower Canning River (Bottom)


NH

3-N

(m

g L

-1)

0

1

2

3









Table 10 Canning Ammonium Nitrogen (NH3-N) (mg L-1



NH3-N Canning Estuary (Surface)

n 8 12 8 8 8 8 9 8 7 7 8 8

min <0.010 0.024 <0.010 0.019 0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 0.013

max 0.270 0.220 0.190 0.150 0.110 0.060 0.050 0.034 0.056 0.110 0.130 0.093

median 0.013 0.140 0.076 0.052 0.026 0.012 0.011 0.016 0.011 0.017 0.032 0.060

NH3-N Canning Estuary (Bottom)

n 8 12 8 8 8 8 9 8 7 7 8 8

min <0.010 0.044 0.060 0.029 0.011 <0.010 <0.010 <0.010 <0.010 0.015 0.011 0.030

max 0.580 0.350 0.640 0.190 0.380 0.150 0.042 0.043 0.480 0.120 0.240 0.380

median 0.075 0.215 0.195 0.042 0.058 0.018 0.016 0.020 0.022 0.025 0.082 0.081

NH3-N Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.064 0.011 0.043 0.012 0.037 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

max 0.140 0.075 0.096 0.050 0.110 0.067 0.095 0.055 0.024 0.020 0.057 0.065

median 0.110 0.052 0.058 0.036 0.074 0.023 0.021 0.013 0.017 0.012 0.011 0.028

NH3-N Lower Canning River (Bottom)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.068 0.025 0.043 0.029 0.038 0.019 <0.010 0.015 0.012 0.010 0.012 0.016

max 0.330 0.190 0.096 0.065 0.120 0.390 0.530 0.091 0.029 0.620 0.140 0.400

median 0.125 0.053 0.061 0.044 0.074 0.051 0.048 0.029 0.017 0.017 0.027 0.054



6 Total Oxidised Nitrogen


) in surface and bottom water, over background (June 2009-May 2014) NOx-N data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) NOx-N Upper Swan Estuary (Surface)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(b) NOx-N Lower Swan Canning Estuary (Bottom)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(c) NOx-N Middle Swan Estuary (Surface)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(d) NOx-N Middle Swan Estuary (Bottom)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(a) NOx-N Lower Swan Canning Estuary (Surface)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4




(f) NOx-N Upper Swan Estuary (Bottom)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4






Table 11 Swan Total Oxidised Nitrogen (NOx-N) (mg L-1



NOx-N Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min <0.010 0.078 0.035 <0.010 <0.010 <0.010 <0.010 <0.010 0.010 0.010 0.010 <0.010

max 0.190 0.160 0.140 0.078 0.014 <0.010 0.010 0.018 0.019 0.025 0.030 0.026

median 0.013 0.092 0.105 0.026 0.011 <0.010 <0.010 0.010 0.016 0.019 0.019 0.009

NOx-N Lower Swan Canning Estuary (Bottom)

n 9 6 6 6 6 6 9 6 6 6 6 6

min <0.010 0.040 0.019 0.012 0.011 <0.010 <0.010 <0.010 <0.010 0.010 <0.010 <0.010

max 0.044 0.067 0.110 0.077 0.029 0.014 0.012 0.021 0.022 0.031 0.034 0.018

median 0.017 0.053 0.046 0.032 0.020 <0.010 <0.010 0.011 0.017 0.017 0.019 0.010

NOx-N Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.015 0.240 0.130 0.098 <0.010 <0.010 <0.010 <0.010 <0.010 0.014 <0.010 0.017

max 0.280 0.340 0.260 0.150 0.140 <0.010 <0.010 0.019 0.025 0.089 0.037 0.170

median 0.098 0.260 0.185 0.140 0.026 <0.010 <0.010 <0.010 0.017 0.021 0.025 0.029

NOx-N Middle Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min <0.010 0.100 0.062 0.025 <0.010 <0.010 <0.010 <0.010 <0.010 0.016 <0.010 0.010

max 0.130 0.330 0.220 0.140 0.055 <0.010 0.012 0.022 0.022 0.086 0.034 0.066

median 0.017 0.150 0.110 0.064 0.022 <0.010 <0.010 0.008 0.020 0.026 0.025 0.019

NOx-N Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min <0.010 0.220 0.079 0.093 <0.010 <0.010 <0.010 <0.010 <0.010 0.012 0.052 0.010

max 0.310 0.390 0.260 0.150 0.150 0.091 0.088 0.065 0.091 0.170 0.150 0.180

median 0.067 0.325 0.175 0.115 0.120 0.012 <0.010 0.012 0.034 0.079 0.112 0.119

NOx-N Upper Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min <0.010 0.220 0.075 0.071 0.011 <0.010 <0.010 <0.010 0.023 0.023 0.041 0.016

max 0.250 0.390 0.260 0.140 0.150 0.098 0.097 0.066 0.079 0.180 0.160 0.170

median 0.071 0.320 0.170 0.110 0.104 0.013 <0.010 0.012 0.031 0.083 0.095 0.081




) in surface and bottom water, over background (June 2009-May 2014) NOx-N data, in the Canning Estuary and Lower Canning River.

(a) NOx-N Canning Estuary (Surface)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(b) NOx-N Canning Estuary (Bottom)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(c) NOx-N Lower Canning River (Surface)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4




(d) NOx-N Lower Canning River (Bottom)


NO

x-N

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4






Table 12 Canning Total Oxidised Nitrogen (NOx-N) (mg L-1



NOx-N Canning Estuary (Surface)

n 8 12 8 8 8 8 9 8 7 7 8 8

min <0.010 0.130 0.180 0.012 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 0.010

max 0.065 0.860 0.670 0.490 0.330 0.053 0.032 0.026 0.015 0.024 0.032 0.460

median 0.011 0.450 0.260 0.310 0.077 <0.010 <0.010 0.013 0.013 0.016 0.015 0.031

NOx-N Canning Estuary (Bottom)

n 8 12 8 8 8 8 9 8 7 7 8 8

min <0.010 0.061 0.055 <0.010 <0.010 <0.010 <0.010 <0.010 0.010 <0.010 <0.010 <0.010

max 0.027 0.850 0.490 0.480 0.310 0.016 0.032 0.030 0.019 0.023 0.037 0.440

median <0.010 0.115 0.150 0.310 0.022 0.005 0.011 0.015 0.013 0.018 0.018 0.022

NOx-N Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.300 0.720 0.460 0.380 0.290 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

max 0.480 0.920 0.670 0.490 0.350 0.190 0.078 0.025 0.013 0.020 0.061 0.560

median 0.355 0.835 0.570 0.435 0.330 0.059 <0.010 0.014 <0.010 0.011 0.014 0.254

NOx-N Lower Canning River (Bottom)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.210 0.660 0.450 0.380 0.280 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

max 0.480 0.920 0.670 0.490 0.360 0.200 0.082 0.037 0.016 0.021 0.060 0.570

median 0.340 0.835 0.565 0.430 0.325 0.070 0.013 0.016 <0.010 0.008 0.013 0.227



7 Dissolved Organic Nitrogen


) in surface and bottom water, over background (July 2009-May2014) DOrgN data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) DOrgN Upper Swan Estuary (Surface)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(f) DOrgN Upper Swan Estuary (Bottom)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(b) DOrgN Lower Swan Canning Estuary (Bottom)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(c) DOrgN Middle Swan Estuary (Surface)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(d) DOrgN Middle Swan Estuary (Bottom)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(a) DOrgN Lower Swan Canning Estuary (Surface)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4



Monthly background 10th & 90th percentile Monthly background 10th & 90th percentile





Table 13 Swan Dissolved Organic Nitrogen (DOrgN) (mg L-1



DOrgN Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 0.18 0.19 0.38 0.13 0.21 0.22 0.17 0.13 0.20 0.15 0.16 0.07

max 0.42 0.56 0.54 0.54 0.44 0.38 0.30 0.24 0.29 0.28 0.28 0.25

median 0.30 0.34 0.43 0.28 0.27 0.28 0.21 0.17 0.24 0.21 0.22 0.18

DOrgN Lower Swan Canning Estuary (Bottom)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 0.12 0.10 0.11 0.06 0.09 0.14 0.08 0.10 0.16 0.11 0.13 0.12

max 0.27 0.22 0.38 0.22 0.26 0.28 0.27 0.25 0.28 0.26 0.30 0.20

median 0.18 0.19 0.17 0.10 0.12 0.19 0.18 0.14 0.23 0.19 0.23 0.18

DOrgN Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.39 0.57 0.60 0.45 0.49 0.47 0.32 0.29 0.34 0.33 0.31 0.25

max 0.90 0.85 0.93 0.70 0.66 0.80 0.63 0.54 0.62 0.52 0.47 0.38

median 0.62 0.78 0.72 0.65 0.59 0.61 0.48 0.46 0.45 0.44 0.42 0.30

DOrgN Middle Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.24 0.31 0.36 0.34 0.32 0.34 0.27 0.23 0.32 0.35 0.29 0.23

max 0.46 1.10 0.69 0.66 0.53 0.68 0.53 0.50 0.58 0.51 0.47 0.35

median 0.34 0.44 0.44 0.46 0.46 0.47 0.38 0.41 0.45 0.42 0.40 0.29

DOrgN Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.69 0.80 0.76 0.64 0.60 0.65 0.48 0.51 0.57 0.49 0.44 0.35

max 1.10 1.10 0.86 0.71 0.70 0.73 0.79 0.72 0.68 0.65 0.60 0.47

median 0.82 0.90 0.80 0.67 0.64 0.70 0.68 0.62 0.65 0.59 0.52 0.42

DOrgN Upper Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.42 0.87 0.76 0.66 0.56 0.66 0.58 0.45 0.55 0.52 0.47 0.35

max 1.10 1.00 0.88 0.73 0.72 0.72 0.80 0.69 0.71 0.64 0.59 0.44

median 0.57 0.93 0.79 0.71 0.65 0.71 0.68 0.59 0.63 0.57 0.50 0.40




) in surface and bottom water, over background (July 2009-May 2014) DOrgN data, in the Canning Estuary and Lower Canning River.

(c) DOrgN Lower Canning River (Surface)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(d) DOrgN Lower Canning River (Bottom)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(a) DOrgN Canning Estuary (Surface)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

(b) DOrgN Canning Estuary (Bottom)


DO

rgN

(m

g L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4









Table 14 Canning Dissolved Organic Nitrogen (DOrgN) (mg L-1



DOrgN Canning Estuary (Surface)

n 8 12 8 8 8 8 9 8 7 7 8 8

min 0.24 0.23 0.37 0.32 0.30 0.29 0.21 0.24 0.29 0.27 0.19 0.25

max 0.44 0.49 0.63 0.56 0.55 0.72 0.47 0.63 0.56 0.64 0.48 0.42

median 0.29 0.34 0.41 0.41 0.49 0.44 0.36 0.43 0.42 0.33 0.39 0.33

DOrgN Canning Estuary (Bottom)

n 8 12 8 8 8 8 9 8 7 7 8 8

min 0.22 0.13 0.20 0.22 0.16 0.23 0.21 0.27 0.27 0.24 0.16 0.20

max 0.35 0.50 0.59 0.55 0.53 0.94 0.45 0.59 0.50 0.50 0.57 0.38

median 0.26 0.24 0.34 0.41 0.38 0.40 0.34 0.43 0.41 0.34 0.32 0.31

DOrgN Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.44 0.26 0.56 0.40 0.45 0.61 0.29 0.01 0.46 0.40 0.33 0.30

max 0.56 0.61 0.71 0.60 0.57 0.73 0.58 0.62 0.65 0.52 0.56 0.57

median 0.51 0.46 0.63 0.51 0.52 0.63 0.52 0.46 0.58 0.46 0.41 0.43

DOrgN Lower Canning River (Bottom)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.45 0.26 0.58 0.41 0.46 0.58 0.45 0.01 0.46 0.40 0.29 0.31

max 0.59 0.73 0.72 0.56 0.59 0.70 0.61 0.59 0.62 0.52 0.54 0.47

median 0.53 0.49 0.62 0.49 0.53 0.63 0.52 0.47 0.57 0.46 0.40 0.43



8 Total Phosphorus


) in surface and bottom water, over background (June 2008-May 2013) TP data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) TP Upper Swan Estuary (Surface)


TP

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

(b) TP Lower Swan Canning Estuary (Bottom)


TP

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

(c) TP Middle Swan Estuary (Surface)


TP

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

(d) TP Middle Swan Estuary (Bottom)


TP

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

(a) TP Lower Swan Canning Estuary (Surface)


TP

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4

(f) TP Upper Swan Estuary (Bottom)


TP

(m

g L

-1)

0.0

0.1

0.2

0.3

0.4









Table 15 Swan Total Phosphorus (TP) (mg L-1



TP Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 0.007 <0.005 <0.005 0.009 0.007 0.006 0.011 0.014 0.023 0.016 <0.005 <0.005

max 0.035 0.028 0.021 0.032 0.036 0.029 0.040 0.043 0.044 0.053 0.032 0.022

median 0.018 0.010 0.010 0.019 0.018 0.015 0.019 0.025 0.033 0.030 0.012 0.009

TP Lower Swan Canning Estuary (Bottom)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 0.008 <0.005 <0.005 0.007 0.016 0.005 0.011 0.011 0.019 0.017 <0.005 <0.005

max 0.033 0.025 0.042 0.030 0.034 0.034 0.044 0.051 0.047 0.057 0.032 0.020

median 0.018 0.014 0.014 0.020 0.027 0.017 0.022 0.020 0.035 0.027 0.011 0.014

TP Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.025 0.022 0.031 0.042 0.036 0.040 0.051 0.060 0.060 0.056 0.009 0.019

max 0.071 0.060 0.050 0.056 0.065 0.130 0.210 0.160 0.130 0.130 0.100 0.066

median 0.053 0.040 0.039 0.054 0.060 0.075 0.092 0.110 0.110 0.096 0.060 0.045

TP Middle Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.023 0.024 0.010 0.030 0.036 0.036 0.052 0.062 0.069 0.052 0.028 0.025

max 0.095 0.067 0.110 0.120 0.120 0.210 0.170 0.140 0.140 0.120 0.094 0.062

median 0.054 0.049 0.052 0.065 0.077 0.130 0.088 0.105 0.104 0.088 0.043 0.046

TP Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.013 0.024 0.020 0.025 0.035 0.036 0.032 0.060 0.066 0.059 0.039 0.052

max 0.073 0.075 0.039 0.052 0.057 0.120 0.220 0.200 0.120 0.130 0.120 0.088

median 0.044 0.045 0.032 0.042 0.050 0.056 0.088 0.120 0.095 0.110 0.080 0.062

TP Upper Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.015 0.028 0.026 0.034 0.042 0.028 0.028 0.056 0.064 0.052 0.036 0.052

max 0.150 0.078 0.053 0.047 0.110 0.160 0.210 0.180 0.140 0.120 0.120 0.068

median 0.076 0.045 0.036 0.043 0.054 0.052 0.106 0.140 0.115 0.097 0.077 0.062




) in surface and bottom water, over background (June 2009-May 2014) TP data, in the Canning Estuary and Lower Canning River.

(c) TP Lower Canning River (Surface)


TP

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

(d) TP Lower Canning River (Bottom)


TP

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

(a) TP Canning Estuary (Surface)


TP

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0

(b) TP Canning Estuary (Bottom)


TP

(m

g L

-1)

0.0

0.5

1.0

1.5

2.0









Table 16 Canning Total Phosphorus (TP) (mg L-1



TP Canning Estuary (Surface)

n 8 12 8 8 8 7 9 8 7 7 8 8

min 0.023 0.011 0.006 0.022 0.020 0.025 0.037 0.035 0.034 0.019 0.013 <0.005

max 0.180 0.094 0.092 0.100 0.120 0.220 0.130 0.320 0.230 0.260 0.180 0.088

median 0.082 0.055 0.052 0.067 0.065 0.063 0.069 0.083 0.076 0.053 0.045 0.035

TP Canning Estuary (Bottom)

n 8 12 8 8 8 8 9 8 7 7 8 8

min 0.021 0.018 0.028 0.021 0.023 0.030 0.031 0.038 0.037 0.015 0.010 <0.005

max 0.320 0.097 0.130 0.100 0.130 0.310 0.210 0.320 0.970 0.110 0.160 0.087

median 0.080 0.043 0.062 0.064 0.068 0.121 0.067 0.105 0.064 0.047 0.035 0.028

TP Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.058 0.057 0.082 0.079 0.081 0.087 0.073 0.050 0.055 0.034 0.036 0.054

max 0.085 0.110 0.091 0.100 0.097 0.120 0.140 0.098 0.140 0.130 0.064 0.098

median 0.075 0.070 0.087 0.090 0.090 0.099 0.115 0.076 0.096 0.049 0.051 0.080

TP Lower Canning River (Bottom)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.055 0.054 0.080 0.067 0.074 0.094 0.078 0.055 0.051 0.040 0.033 0.039

max 0.120 0.110 0.110 0.110 0.097 0.220 0.200 0.160 0.200 0.180 0.120 0.180

median 0.084 0.078 0.085 0.088 0.089 0.125 0.120 0.095 0.088 0.056 0.052 0.085



9 Soluble Reactive Phosphorus


) in surface and bottom water, over background (June 2009-May 2014) SRP data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) SRP Upper Swan Estuary (Surface)


SR

P (

mg

L-1

)

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

(f) SRP Upper Swan Estuary (Bottom)


SR

P (

mg

L-1

)

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

(b) SRP Lower Swan Canning Estuary (Bottom)


SR

P (

mg

L-1

)

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

(c) SRP Middle Swan Estuary (Surface)


SR

P (

mg

L-1

)

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

(d) SRP Middle Swan Estuary (Bottom)


SR

P (

mg

L-1

)

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

(a) SRP Lower Swan Canning Estuary (Surface)


SR

P (

mg

L-1

)

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14



14/15 monthly Median 14/15 monthly Median





Table 17 Swan Soluble Reactive Phosphorus (SRP) (mg L-1



SRP Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 0.007 0.007 <0.005 <0.005

max 0.008 0.009 <0.005 0.008 0.008 <0.005 0.013 0.016 0.027 0.023 0.026 0.021

median 0.006 <0.005 <0.005 0.007 0.006 <0.005 <0.005 0.010 0.018 0.019 0.011 0.007

SRP Lower Swan Canning Estuary (Bottom)

n 9 6 6 6 6 6 9 6 6 6 6 6

min <0.005 <0.005 <0.005 0.003 0.011 <0.005 <0.005 <0.005 0.008 0.009 <0.005 <0.005

max 0.018 0.022 0.019 0.015 0.026 0.013 0.015 0.019 0.028 0.024 0.027 0.017

median 0.007 0.014 0.003 0.011 0.018 0.008 0.003 0.009 0.020 0.019 0.009 0.011

SRP Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min <0.005 0.009 <0.005 0.012 0.005 0.006 0.006 0.022 0.022 0.027 0.008 0.019

max 0.025 0.025 0.012 0.030 0.028 0.028 0.040 0.065 0.074 0.077 0.072 0.043

median 0.008 0.013 0.007 0.024 0.012 0.019 0.024 0.056 0.047 0.059 0.040 0.037

SRP Middle Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 0.011 0.014 <0.005 0.015 0.017 0.009 <0.005 0.022 0.028 0.027 0.021 0.018

max 0.055 0.056 0.051 0.060 0.065 0.080 0.068 0.075 0.075 0.079 0.075 0.053

median 0.029 0.027 0.030 0.040 0.047 0.039 0.034 0.044 0.051 0.057 0.038 0.039

SRP Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min <0.005 <0.005 <0.005 0.007 <0.005 <0.005 <0.005 0.018 0.014 0.030 0.035 0.033

max 0.023 0.021 <0.005 0.028 0.022 0.039 0.038 0.058 0.069 0.078 0.079 0.054

median <0.005 0.009 <0.005 0.011 0.019 0.007 0.011 0.034 0.033 0.058 0.068 0.049

SRP Upper Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min <0.005 <0.005 <0.005 0.008 0.018 0.006 <0.005 0.024 0.022 0.039 0.035 0.030

max 0.053 0.021 0.015 0.033 0.038 0.034 0.058 0.085 0.081 0.084 0.082 0.060

median 0.038 0.016 <0.005 0.017 0.023 0.009 0.025 0.066 0.055 0.066 0.069 0.050




) in surface and bottom water, over background (June 2009-May 2014) SRP data, in the Canning Estuary and Lower Canning River.

(a) SRP Canning Estuary (Surface)


SR

P (

mg L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

(b) SRP Canning Estuary (Bottom)


SR

P (

mg L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

(c) SRP Lower Canning River (Surface)


SR

P (

mg L

-1)

0.0

0.2

0.4

0.6

0.8

1.0

(d) SRP Lower Canning River (Bottom)


SR

P (

mg L

-1)

0.0

0.2

0.4

0.6

0.8

1.0




Monthly background10th & 90th percentile

Monthly backgorund Median




Table 18 Canning Soluble Reactive Phosphorus (SRP) (mg L-1



SRP Canning Estuary (Surface)

n 8 12 8 8 8 8 9 8 7 7 8 8

min <0.005 0.007 <0.005 0.005 0.005 0.008 <0.005 0.015 0.011 0.015 0.009 <0.005

max 0.044 0.058 0.036 0.041 0.049 0.050 0.049 0.092 0.035 0.049 0.035 0.041

median 0.017 0.027 0.010 0.027 0.021 0.018 0.018 0.026 0.027 0.024 0.024 0.017

SRP Canning Estuary (Bottom)

n 8 12 8 8 8 8 9 8 7 7 8 8

min 0.010 0.014 0.006 0.009 0.012 0.014 <0.005 0.019 0.020 0.013 0.010 <0.005

max 0.200 0.048 0.049 0.050 0.043 0.082 0.030 0.097 0.460 0.045 0.088 0.047

median 0.022 0.026 0.021 0.030 0.028 0.025 0.022 0.029 0.034 0.023 0.023 0.025

SRP Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.024 0.029 0.032 0.033 0.037 0.028 0.006 0.009 0.020 <0.005 0.009 0.010

max 0.033 0.054 0.041 0.048 0.056 0.051 0.073 0.052 0.049 0.025 0.025 0.039

median 0.032 0.034 0.036 0.041 0.051 0.036 0.038 0.019 0.026 0.008 0.017 0.026

SRP Lower Canning River (Bottom)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 0.031 0.028 0.032 0.033 0.039 0.035 0.014 0.013 0.020 0.007 0.010 0.014

max 0.041 0.053 0.042 0.052 0.063 0.097 0.100 0.082 0.085 0.033 0.030 0.096

median 0.035 0.037 0.036 0.041 0.051 0.046 0.043 0.032 0.028 0.010 0.021 0.037



10 Silica


) in surface and bottom water, over background (July 2009-May 2014) SiO2-Si data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(f) SiO2-Si Upper Swan Estuary (Bottom)


SiO

2-S

i (m

g L

-1)

0

2

4

6

8

(b) SiO2-Si Lower Swan Canning Estuary (Bottom)


SiO

2-S

i (m

g L

-1)

0

2

4

6

8

(c) SiO2-Si Middle Swan Estuary (Surface)


SiO

2-S

i (m

g L

-1)

0

2

4

6

8

(d) SiO2-Si Middle Swan Estuary (Bottom)


SiO

2-S

i (m

g L

-1)

0

2

4

6

8

(a) SiO2-Si Lower Swan Canning Estuary (Surface)


SiO

2-S

i (m

g L

-1)

0

2

4

6

8




(e) SiO2-Si Upper Swan Estuary (Surface)


SiO

2-S

i (m

g L

-1)

0

2

4

6

8






Table 19 Swan Silica (soluble reactive as Silicon (SiO2-Si)) (mg L-1



SiO2-Si Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 1.00 1.40 1.60 0.87 0.95 0.66 0.60 0.81 0.32 0.51 0.52 0.52

max 2.90 4.10 3.00 2.70 2.30 2.30 2.10 4.20 1.80 2.40 1.80 2.50

median 1.60 2.05 2.15 1.45 1.30 1.17 1.10 2.00 0.85 1.40 1.30 1.24

SiO2-Si Lower Swan Canning Estuary (Bottom)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 0.32 0.74 0.75 0.47 0.50 0.37 0.57 1.10 0.24 0.56 0.46 0.79

max 1.80 2.30 2.20 2.00 1.70 1.90 2.30 3.80 1.60 2.30 1.70 2.30

median 1.30 1.40 1.30 1.09 0.95 0.97 1.10 2.20 0.75 1.45 1.25 1.40

SiO2-Si Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 2.30 3.70 3.20 2.60 2.50 2.10 2.10 2.90 1.90 2.20 2.10 1.70

max 5.30 5.10 3.90 3.70 3.10 3.00 3.90 5.10 3.10 3.70 3.40 3.00

median 3.15 4.85 3.45 3.10 2.85 2.40 3.10 4.45 2.55 2.65 2.65 2.15

SiO2-Si Middle Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 1.70 2.40 2.10 2.20 2.10 1.60 2.10 2.60 1.70 2.20 1.90 1.70

max 3.30 5.20 3.90 3.60 3.90 2.70 3.20 4.60 3.00 3.50 3.20 3.00

median 2.30 3.10 3.15 3.10 2.85 2.35 2.65 3.95 2.55 2.70 2.55 2.35

SiO2-Si Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 3.40 4.90 2.30 2.30 2.40 2.20 3.20 4.90 3.00 3.10 3.50 2.60

max 5.60 5.10 3.70 3.50 3.10 3.30 4.60 6.70 5.60 5.30 5.20 4.00

median 3.95 5.05 3.25 3.35 2.85 2.80 3.90 5.60 3.95 4.45 4.20 3.35

SiO2-Si Upper Swan Estuary (Bottom)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 2.50 5.00 2.30 2.30 2.30 2.20 3.30 4.50 3.00 3.10 3.30 2.50

max 5.60 5.30 3.70 3.60 3.60 3.40 4.60 6.80 5.50 5.30 5.40 4.00

median 3.75 5.15 3.30 3.05 2.65 2.80 3.95 5.40 3.95 4.45 4.50 3.30




) in surface water, over background (July 2009-May 2014) SiO2-Si data, in the Canning Estuary and Lower Canning River.

(b) SiO2-Si Lower Canning River (Surface)


SiO

2-S

i (m

g L

-1)

0

2

4

6

8

(a) SiO2-Si Canning Estuary (Surface)


SiO

2-S

i (m

g L

-1)

0

2

4

6

8






Table 20 Canning Silica (soluble reactive as Silicon (SiO2-Si)) (mg L-1



SiO2-Si Canning Estuary (Surface)

n 8 12 7 8 8 8 9 8 7 7 8 8

min 1.70 2.10 2.20 2.20 1.30 1.10 0.96 0.62 0.67 1.50 1.70 1.60

max 3.30 4.40 4.50 4.00 4.00 3.90 1.90 2.70 2.40 2.60 2.60 2.60

median 2.45 3.20 2.90 3.00 2.80 2.15 1.30 1.55 1.80 2.30 2.00 1.85

SiO2-Si Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 3.90 3.60 4.60 3.20 3.50 3.00 2.10 2.20 2.60 2.50 2.80 1.90

max 4.90 5.80 4.80 4.00 4.20 4.40 3.40 2.80 3.80 3.60 4.00 3.80

median 4.55 4.55 4.65 3.80 3.90 3.75 2.85 2.45 3.15 3.30 3.15 3.10



11 Dissolved Organic Carbon


) in surface water, over background (June 2009-May 2014) DOC data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(b) DOC Middle Swan Estuary (Surface)


DO

C (

mg

L-1

)

0

5

10

15

20

25

(c) DOC Upper Swan Estuary (Surface)


DO

C (

mg

L-1

)

0

5

10

15

20

25

(a) DOC Lower Swan Canning Estuary (Surface)


DO

C (

mg

L-1

)

0

5

10

15

20

25






Table 21 Swan Dissolved Organic Carbon (DOC) (mg L-1



DOC Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 3 4 6 3 5 4 3 3 3 2 2 2

max 8 12 10 9 9 7 5 4 4 4 5 4

median 5 5 8 6 6 5 4 3 4 4 4 4

DOC Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 5 11 11 10 10 9 7 6 6 5 5 5

max 16 19 16 15 14 15 13 11 10 9 9 7

median 10 17 14 13 13 12 10 9 8 7 7 6

DOC Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 12 16 15 13 13 14 13 12 11 9 9 8

max 21 20 16 15 14 16 15 15 15 14 12 10

median 17 18 16 15 14 15 14 14 13 12 10 9




) in surface water, over background (June 2009-May 2014) DOC data, in the Canning Estuary and Lower Canning River.

(a) DOC Canning Estuary (Surface)


DO

C (

mg

L-1

)

0

5

10

15

20

25

(b) DOC Lower Canning River (Surface)


DO

C (

mg

L-1

)

0

5

10

15

20

25

Monthly background10th & 90th percentile





Table 22 Canning Dissolved Organic Carbon (DOC) (mg L-1



DOC Canning Estuary (Surface)

n 8 12 7 8 8 8 9 8 7 7 8 8

min 3 5 8 8 6 6 4 4 4 3 4 4

max 6 15 16 12 13 15 11 11 9 9 8 7

median 5 10 10 10 11 10 6 7 6 5 5 6

DOC Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 10 10 13 10 10 14 9 7 12 12 8 7

max 13 17 18 13 14 17 14 14 14 14 11 9

median 12 14 15 11 13 16 13 12 13 13 9 9



12 Total Suspended Solids

Figure 25 2014/2015 Total Suspended Solids (TSS) (mg L-1

) in surface water, over background (June 2009-May 2014) TSS data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(b) TSS Middle Swan Estuary (Surface)


TS

S (

mg L

-1)

0

5

10

15

20

25

30

(a) TSS Lower Swan Canning Estuary (Surface)


TS

S (

mg L

-1)

0

5

10

15

20

25

30

(c) TSS Upper Swan Estuary (Surface)


TS

S (

mg L

-1)

0

5

10

15

20

25

30






Table 23 Swan Total Suspended Solids (TSS) (mg L-1



TSS Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 2 2 1 2 1 2 1 2 1 1 1 1

max 3 4 3 9 6 9 7 9 8 11 7 7

median 2 2 3 3 2 3 3 4 4 4 3 3

TSS Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 2 2 2 2 2 3 2 4 3 3 2 2

max 6 6 4 4 7 11 14 8 8 8 5 7

median 3 3 3 3 3 6 5 6 5 6 5 3

TSS Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 2 3 2 2 1 5 4 5 5 5 3 2

max 8 21 5 7 8 11 14 14 13 11 7 9

median 5 6 4 5 3 7 10 9 10 8 5 5



13 Alkalinity

Figure 26 2014/2015 Alkalinity (tot) (CaCO3) (mg L

-1) in surface water, over background (June

2009-May 2014) Alkalinity data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(a) Alkalinity Lower Swan Canning Estuary (Surface)


Alk

alin

ity (

mg

L-1

)

0

20

40

60

80

100

120

140

160

180

(c) Alkalinity Upper Swan Estuary (Surface)


Alk

alin

ity (

mg

L-1

)

0

20

40

60

80

100

120

140

160

180

(b) Alkalinity Middle Swan Estuary(Surface)


Alk

alin

ity (

mg

L-1

)

0

20

40

60

80

100

120

140

160

180






Table 24 Swan Alkalinity (tot) (CaCO3) (mg L

-1) monthly sample numbers (n), minimum, maximum

and median values for 2014/2015.


Alkalinity Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 98 82 94 100 100 110 120 120 120 120 120 110

max 120 100 110 120 110 120 120 120 130 120 130 120

median 110 98 100 110 110 115 120 120 120 120 120 120

Alkalinity Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 90 78 87 91 93 110 120 120 120 120 120 82

max 130 91 100 110 100 120 130 130 130 130 130 120

median 110 85 94 100 100 120 120 130 120 120 120 120

Alkalinity Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 89 77 90 85 92 120 120 130 130 130 130 110

max 140 96 110 110 110 130 140 160 160 160 160 140

median 130 82 94 93 100 120 130 140 150 145 140 130



14 Chlorophyll a


) in surface and integrated water, over background (June 2009-May 2014) Chl a data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(b) Chl a Lower Swan Canning Estuary (Integrated)


Ch

l a

(µ

g L

-1)

0

20

40

60

80

(a) Chl a Lower Swan Canning Estuary (Surface)


Ch

l a

(µ

g L

-1)

0

20

40

60

80

(d) Chl a Middle Swan Estuary (Integrated)


Ch

l a

(µ

g L

-1)

0

20

40

60

80

(c) Chl a Middle Swan Estuary (Surface)


Ch

l a

(µ

g L

-1)

0

20

40

60

80

(f) Chl a Upper Swan Estuary (Integrated)


Ch

l a

(µ

g L

-1)

0

20

40

60

80

(e) Chl a Upper Swan Estuary (Surface)


Ch

l a

(µ

gL

-1)

0

20

40

60

80









Table 25 Swan Chlorophyll a (Chl a) (µg L-1



Chl a Lower Swan Canning Estuary (Surface)

n 9 6 6 6 6 6 9 6 6 6 6 6

min 1.5 1.3 3.7 2.1 0.5 1.8 0.8 1.3 1.4 0.7 1.1 <0.5

max 11.0 16.0 9.3 12.0 3.7 3.5 3.9 3.1 2.9 2.6 2.5 3.7

median 4.0 2.3 6.3 8.6 2.5 2.3 2.1 2.4 2.1 1.6 1.85 0.75

Chl a Lower Swan Canning Estuary (Integrated)

n 15 12 12 15 12 12 15 12 12 15 12 12

min 0.8 0.8 0.9 1.4 1.2 1.6 1.5 0.6 1.8 0.8 0.6 <0.5

max 5.5 5.0 5.2 24.0 4.6 4.2 4.8 2.9 4.2 3.6 3 2.8

median 2.2 1.8 2.2 4.5 2.2 2.8 2.3 1.9 2.8 2.5 1.75 1.15

Chl a Middle Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 2.6 2.5 2.9 0.7 4.9 3.5 3.6 2.1 3.9 4 4.6 <0.5

max 31.0 20.0 13.0 10.0 30.0 32.0 39.0 12.0 14.0 8.6 19 9

median 13.0 8.7 5.3 2.8 7.9 14.0 10.9 6.8 6.9 7.15 6.95 2.4

Chl a Middle Swan Estuary (Integrated)

n 20 16 16 20 16 16 20 16 16 20 16 16

min 1.1 1.9 <0.5 <0.5 2.5 2.7 2.2 1.5 1.8 3.6 2.3 0.6

max 6.5 16.0 14.0 7.6 16.0 14.0 24.0 13 12 13 9.5 6.4

median 4.1 4.3 3.1 1.9 5.9 5.2 7.0 4.0 4.7 6.2 4.45 2.7

Chl a Upper Swan Estuary (Surface)

n 12 8 8 8 8 8 12 8 8 8 8 8

min 4.8 4.6 2.8 1.2 1.1 1.8 6.4 5.9 5.2 6.6 2.1 2.3

max 68.0 21.0 8.4 9.6 22.0 20.0 43.0 36.0 18.0 12 25 18

median 14.0 9.4 4.3 4.5 2.5 12.5 15.0 18.5 12.5 8.45 8.5 3.8

Chl a Upper Swan Estuary (Integrated)

n 20 16 16 20 16 16 20 16 16 20 12 16

min 2.2 1.7 1.0 0.7 0.7 1.1 1 1.8 2.2 3.3 1.8 <0.5

max 53.0 19.0 21.0 8.6 8.4 12.0 21.0 27.0 12.0 14 4.5 13

median 6.1 8.9 4.6 2.3 2.7 5.2 7.75 8.2 8.6 6.1 3.45 2.4




) in surface and integrated water, over background (June 2009-May 2014) Chl a data, in the Canning Estuary and Lower Canning River.

(c) Chl a Lower Canning River (Surface)


Chl a (

µg L

-1)

0

10

20

30

40

50

60

(d) Chl a Lower Canning River (Integrated)


Chl a (

µg L

-1)

0

10

20

30

40

50

60

(a) Chl a Canning Estuary (Surface)


Chl a (

µg L

-1)

0

10

20

30

40

50

60

(b) Chl a Canning Estuary (Integrated)


Chl a (

µg L

-1)

0

10

20

30

40

50

60









Table 26 Canning Chlorophyll a (Chl a) (µg L-1



Chl a Canning Estuary (Surface)

n 8 12 8 8 8 8 9 8 7 7 8 8

min 1.7 0.7 1.4 0.6 3.0 1.5 2.0 2.7 2.5 1.5 2.9 1.8

max 98.0 5.1 11.0 18.0 40.0 93 43.0 41.0 51.0 18.0 35.0 42.0

median 11.9 2.4 6.9 3.6 5.2 11.1 4.4 5.8 7.4 8.2 7.6 2.7

Chl a Canning Estuary (Integrated)

n 16 20 16 16 18 15 15 15 13 18 14 16

min 1.4 0.8 <0.5 1.1 1.6 1.9 2.5 2.3 1.4 2.1 2.0 1.1

max 43 6.1 9.6 16 17.0 79.0 74.0 23.0 30.0 15.0 20.0 15.0

median 4.2 1.3 2.5 2.55 6.0 12.0 5.8 4.1 5.1 5.6 5.1 2.6

Chl a Lower Canning River (Surface)

n 6 12 8 8 8 8 12 8 8 8 8 8

min 1.4 0.6 <0.5 0.5 1.5 1.7 2.4 2.4 9.3 6.8 2.5 0.7

max 4.3 1.3 1.9 2.8 6.2 19.0 32.0 13.0 33.0 110.0 44.0 19.0

median 2.4 1.0 1.2 1.3 2.6 9.9 7.9 5.6 18.0 11.4 13.5 5.3

Chl a Lower Canning River (Integrated)

n 14 20 16 16 20 16 20 16 16 20 16 16

min <0.5 0.7 <0.5 <0.5 0.8 1.3 2.1 1.9 4.8 7.4 2.1 1.1

max 6.6 1.8 3.0 2.5 10.0 14.0 18.0 24.0 20.0 53.0 20.0 57.0

median 1.8 1.1 1.3 1.25 2.1 7.2 5.9 6.2 9.6 11.5 11.0 5.6



15 Dissolved Oxygen


) (in situ) in surface and bottom water, over background (July 2009-May 2014) DO data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) DO Upper Swan Estuary (Surface)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(b) DO Lower Swan Canning Estuary (Bottom)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(c) DO Middle Swan Estuary (Surface)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(d) DO Middle Swan Estuary (Bottom)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(a) DO Lower Swan Canning Estuary (Surface)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(f) DO Upper Swan Estuary (Bottom)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14










) (in situ) in surface and bottom water, over background (July 2009-May 2014) DO data, in the Swan River.


) (in situ) in surface and bottom water, over background (June 2009-May 2014) DO data, in the Canning Estuary and Lower Canning River.







(b) DO Swan River (Bottom)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(a) DO Swan River (Surface)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(c) DO Lower Canning River (Surface)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(d) DO Lower Canning River (Bottom)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(a) DO Canning Estuary (Surface)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14

(b) DO Canning Estuary (Bottom)


DO

(m

g L

-1)

0

2

4

6

8

10

12

14









Table 27 Swan Dissolved Oxygen (DO) (mg L-1

) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


DO Lower Swan Canning Estuary (Surface)

n 20 16 16 20 16 16 20 12 16 19 17 16

min 7.12 7.52 7.93 7.02 7.02 6.76 6.24 5.84 6.07 5.70 6.19 6.74

max 8.97 10.73 9.41 10.16 8.41 7.92 7.79 7.22 7.04 6.91 7.43 8.42

median 8.12 8.55 8.91 8.46 7.69 7.39 6.96 6.64 6.47 6.48 7.02 7.47

DO Lower Swan Canning Estuary (Bottom)

n 20 16 16 20 16 16 20 12 16 21 16 16

min 3.00 3.67 1.31 1.33 1.25 2.38 3.69 5.41 5.18 5.48 6.02 6.51

max 7.62 7.95 7.65 7.25 7.23 7.29 6.97 6.77 6.49 6.54 7.36 7.62

median 5.89 5.57 4.67 5.17 4.83 4.66 5.64 5.94 6.18 6.14 6.70 7.02

DO Middle Swan Estuary (Surface)

n 20 16 16 20 16 16 20 11 16 20 16 16

min 4.61 7.74 6.82 6.41 6.51 5.92 5.60 5.28 5.43 5.64 5.84 5.85

max 9.27 10.31 9.07 8.06 9.73 8.68 10.29 7.66 7.59 9.45 9.21 7.76

median 7.74 8.82 7.96 7.14 7.44 7.26 7.07 6.81 6.24 6.49 7.35 6.82

DO Middle Swan Estuary (Bottom)

n 20 16 16 20 16 16 21 12 16 20 16 16

min 0.57 1.32 0.60 0.34 0.36 0.88 1.05 4.45 4.16 4.11 1.42 3.40

max 5.91 8.55 8.83 7.39 6.15 6.46 6.89 6.03 6.35 7.03 6.18 6.43

median 2.37 3.47 2.40 2.48 1.27 4.14 4.39 5.41 4.99 5.20 5.45 6.05

DO Upper Swan Estuary (Surface)

n 20 16 16 20 16 12 20 16 16 20 16 16

min 7.11 7.80 6.73 6.15 4.24 3.48 3.44 2.94 2.65 3.39 4.05 5.58

max 10.03 9.92 9.55 8.15 8.66 8.58 9.71 10.62 9.31 10.06 8.08 15.03

median 8.60 9.03 7.97 7.54 6.47 6.01 6.23 7.21 6.32 6.37 6.51 6.84

DO Upper Swan Estuary (Bottom)

n 20 16 16 20 16 12 20 16 16 20 16 16

min 0.45 2.30 0.79 5.70 0.57 3.39 1.81 2.25 2.07 2.69 1.53 3.13

max 9.21 9.47 9.50 7.93 6.96 5.95 6.31 6.13 7.00 6.71 6.50 7.40

median 3.99 8.87 7.73 7.35 5.93 4.76 3.60 3.89 5.01 4.53 5.02 5.77

DO Swan River (Surface)

n 10 8 8 10 8 6 10 8 8 10 8 8

min 7.91 8.38 7.93 6.86 4.52 3.47 3.44 2.85 2.95 2.71 3.98 5.16

max 9.33 9.30 8.91 8.16 7.36 5.87 4.19 3.77 4.09 5.48 7.16 10.85

median 8.88 9.04 8.24 7.67 6.47 4.12 3.83 3.32 3.41 3.76 4.76 5.96

DO Swan River Estuary (Bottom)

n 10 8 8 10 8 6 10 8 8 10 8 8

min 4.29 8.37 7.78 6.69 4.17 3.39 3.24 2.38 2.39 2.32 2.67 4.12

max 9.32 9.24 8.90 8.12 6.62 5.71 3.94 3.36 3.79 3.74 4.96 6.53

median 8.45 9.00 8.19 7.61 6.40 3.94 3.63 2.77 3.09 3.04 4.02 5.07



Table 28 Canning Dissolved Oxygen (DO) (mg L-1) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


DO Canning Estuary (Surface)

n 16 20 16 16 18 15 15 15 13 18 15 16

min 2.19 5.10 5.97 6.84 5.89 4.31 3.89 3.40 2.85 1.73 3.28 2.77

max 9.65 9.26 9.24 9.88 9.70 7.55 6.64 6.59 6.64 6.79 7.30 8.31

median 6.60 8.09 8.13 7.92 6.94 6.44 6.20 5.14 5.84 5.49 6.11 6.32

DO Canning Estuary (Bottom)

n 16 20 16 16 18 15 15 15 13 18 15 16

min 0.54 1.86 0.97 0.79 0.83 0.55 2.01 2.70 0.30 2.10 1.54 0.67

max 8.07 8.35 7.71 8.59 7.47 6.58 6.36 6.39 5.92 6.67 6.51 6.78

median 3.51 4.71 4.01 3.65 4.62 4.70 5.31 5.04 4.70 5.02 4.49 4.34

DO Lower Canning River (Surface)

n 14 20 16 16 20 16 20 16 16 20 16 16

min 5.50 7.43 7.08 6.93 5.69 4.63 4.11 3.66 3.27 4.19 4.94 5.36

max 8.21 8.51 8.45 8.21 7.83 8.77 8.98 8.72 9.09 9.19 7.82 9.78

median 6.86 7.79 7.44 7.63 7.03 7.26 6.14 6.77 6.83 7.00 6.79 7.24

DO Lower Canning River (Bottom)

n 14 20 16 16 20 16 20 16 16 20 16 16

min 2.29 4.96 6.99 6.88 3.49 0.66 0.51 0.60 0.60 1.19 2.03 2.26

max 8.11 8.45 8.25 7.79 7.53 7.41 8.84 6.47 8.05 8.49 6.99 9.79

median 5.96 7.67 7.38 7.55 6.32 4.92 5.10 4.51 4.40 5.46 5.40 5.76



16 Salinity

Figure 32 2014/2015 Salinity (ppt) (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) Salinity Upper Swan Estuary (Surface)


Sa

linity (

pp

t)

0

10

20

30

40

(b) Salinity Lower Swan Canning Estuary (Bottom)


Sa

linity (

pp

t)

0

10

20

30

40

(c) Salinity Middle Swan Estuary (Surface)


Sa

linity (

pp

t)

0

10

20

30

40

(d) Salinity Middle Swan Estuary (Bottom)


Sa

linity (

pp

t)

0

10

20

30

40

(a) Salinity Lower Swan Canning Estuary (Surface)


Sa

linity (

pp

t)

0

10

20

30

40

(f) Salinity Upper Swan Estuary (Bottom)


Sa

linity (

pp

t)

0

10

20

30

40









Figure 33 2014/2015 Salinity (ppt) (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Swan River.

Figure 34 2014/2015 Salinity (ppt) (in situ) in surface and bottom water, over background (June 2009-May 2014) DO data, in the Canning Estuary and Lower Canning River.

(b) Salinity Swan River (Bottom)


Sa

linity (

pp

t)

0

10

20

30

40

(a) Salinity Swan River (Surface)


Sa

linity (

pp

t)

0

10

20

30

40







(c) Salinity Lower Canning River (Surface)


Sa

linity (

pp

t)

0

10

20

30

40

(d) Salinity Lower Canning River (Bottom)


Sa

linity (

pp

t)

0

10

20

30

40

(a) Salinity Canning Estuary (Surface)


Sa

linity (

pp

t)

0

10

20

30

40

(b) Salinity Canning Estuary (Bottom)


Sa

linity (

pp

t)

0

10

20

30

40









Table 29 Swan Salinity (ppt) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


Salinity Lower Swan Canning Estuary (Surface)

n 20 16 16 20 16 16 20 12 16 19 17 16

min 14.59 10.55 7.73 8.12 14.16 20.52 27.56 33.02 34.33 35.52 34.91 31.06

max 33.42 29.60 26.31 29.85 27.40 31.29 33.92 35.47 36.12 36.89 36.53 36.16

median 30.82 23.47 19.13 20.29 21.86 27.39 31.89 34.60 35.67 36.37 36.18 35.03

Salinity Lower Swan Canning Estuary (Bottom)

n 20 16 16 20 16 16 20 12 16 21 16 16

min 31.29 27.44 29.86 23.51 24.70 27.52 28.84 34.17 34.53 35.77 35.41 34.20

max 34.90 34.05 34.48 33.54 34.02 34.50 35.38 35.97 36.17 36.91 36.52 36.18

median 33.86 32.40 32.67 31.78 32.71 33.64 33.81 35.25 35.72 36.45 36.25 35.47

Salinity Middle Swan Estuary (Surface)

n 20 16 16 20 16 16 20 11 16 20 16 16

min 6.43 4.29 5.27 2.02 3.58 6.29 11.08 19.41 23.18 25.14 24.12 24.06

max 28.56 17.51 17.81 12.24 11.82 19.74 27.25 31.07 32.12 33.65 33.96 33.47

median 17.44 6.63 6.34 4.29 6.05 10.82 17.68 24.38 27.10 30.36 29.38 29.14

Salinity Middle Swan Estuary (Bottom)

n 20 16 16 20 16 16 21 12 16 20 16 16

min 21.51 4.33 5.58 2.31 3.81 8.93 14.82 21.76 23.66 26.05 26.85 28.52

max 32.71 26.12 26.25 20.56 20.20 23.24 29.72 33.06 33.66 34.87 35.42 33.66

median 28.33 20.96 20.29 13.95 14.13 17.07 23.38 27.86 28.37 31.55 32.46 31.44

Salinity Upper Swan Estuary (Surface)

n 20 16 16 20 16 12 20 16 16 20 16 16

min 7.51 4.13 4.90 2.44 3.15 5.67 5.43 6.43 11.18 13.92 18.27 17.30

max 18.55 7.42 7.35 5.58 6.95 7.00 13.86 19.38 22.11 25.59 26.24 27.52

median 10.60 5.68 5.44 4.06 4.49 6.61 7.67 13.24 17.88 21.69 22.04 22.60

Salinity Upper Swan Estuary (Bottom)

n 20 16 16 20 16 12 20 16 16 20 16 16

min 8.24 4.38 5.16 2.61 3.88 6.07 5.43 6.43 11.85 15.29 19.34 21.08

max 29.66 22.99 22.82 5.58 8.03 8.40 16.02 21.75 23.10 27.94 29.16 28.46

median 19.56 6.77 5.62 4.58 4.75 6.86 8.89 16.05 19.29 23.70 25.08 25.97

Salinity Swan River (Surface)

n 10 8 8 10 8 6 10 8 8 10 8 8

min 8.87 4.19 5.16 1.35 1.54 6.35 5.55 6.01 9.19 11.95 16.61 9.51

max 10.96 7.61 6.16 5.80 6.41 6.85 6.17 8.31 11.70 17.53 18.03 21.93

median 9.87 5.50 5.72 3.91 4.76 6.73 5.88 6.80 10.17 14.97 17.02 18.97

Salinity Swan River (Bottom)

n 10 8 8 10 8 6 10 8 8 10 8 8

min 9.09 4.55 5.41 3.27 4.70 6.35 5.55 5.99 9.53 12.07 17.03 18.06

max 20.55 7.65 6.17 5.80 6.43 6.85 6.16 9.55 13.97 19.01 21.88 22.42

median 9.87 6.07 5.93 4.56 4.96 6.73 5.88 6.96 10.36 16.18 19.29 20.66



Table 30 Canning Salinity (ppt) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


Salinity Canning Estuary (Surface)

n 16 20 16 16 18 15 15 15 13 18 15 16

min 0.27 0.20 0.25 0.24 0.32 1.04 12.33 17.97 13.01 21.53 21.55 0.21

max 31.33 23.31 20.40 15.71 23.47 27.79 32.59 34.79 34.68 36.20 35.99 35.05

median 25.24 5.66 6.36 1.22 9.93 19.83 27.93 31.42 31.28 34.29 32.38 28.33

Salinity Canning Estuary (Bottom)

n 16 20 16 16 18 15 15 15 13 18 15 16

min 0.27 0.20 0.26 0.24 0.32 9.00 17.13 25.78 25.46 27.46 27.97 0.26

max 32.65 29.73 29.59 26.95 27.90 29.21 32.97 34.92 35.16 36.23 36.10 35.41

median 28.67 22.78 19.62 11.65 20.16 24.73 28.65 32.04 33.61 34.62 34.58 32.26

Salinity Lower Canning River (Surface)

n 14 20 16 16 20 16 20 16 16 20 16 16

min 0.25 0.19 0.23 0.25 0.31 0.47 0.39 0.35 0.24 0.38 0.25 0.19

max 3.58 0.43 0.48 0.44 0.46 0.56 0.54 0.56 0.42 2.05 1.18 1.18

median 0.42 0.27 0.42 0.30 0.40 0.53 0.47 0.52 0.33 0.48 0.38 0.43

Salinity Lower Canning River (Bottom)

n 14 20 16 16 20 16 20 16 16 20 16 16

min 0.25 0.19 0.23 0.25 0.31 0.47 0.40 0.37 0.24 0.38 0.24 0.19

max 13.53 0.87 0.49 0.44 0.52 0.57 0.56 0.55 0.42 13.52 2.62 11.38

median 0.44 0.27 0.42 0.30 0.40 0.53 0.49 0.52 0.33 0.48 0.40 0.43



17 Temperature

Figure 35 2014/2015 Temperature (°C) (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) Temperature Upper Swan Estuary (Surface)


Te

mp

era

ture

(oC

)

10

15

20

25

30

35

(b) Temperature Lower Swan Canning Estuary (Bottom)


Te

mp

era

ture

(oC

)

10

15

20

25

30

35

(c) Temperature Middle Swan Estuary (Surface)


Te

mp

era

ture

(oC

)

10

15

20

25

30

35

(d) Temperature Middle Swan Estuary (Bottom)


Te

mp

era

ture

(oC

)

10

15

20

25

30

35

(a) Temperature Lower Swan Canning Estuary (Surface)


Te

mpe

ratu

re (

oC

)

10

15

20

25

30

35

(f) Temperature Upper Swan Estuary (Bottom)


Te

mp

era

ture

(oC

)

10

15

20

25

30

35









Figure 36 2014/2015 Temperature (°C) (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Swan River.

Figure 37 2014/2015 Temperature (°C) (in situ) in surface and bottom water, over background (June 2009-May 2014) DO data, in the Canning Estuary and Lower Canning River.

(b) Temperature Swan River (Bottom)


Te

mp

era

ture

(oC

)

10

15

20

25

30

35

(a) Temperature Swan River (Surface)


Te

mp

era

ture

(oC

)

10

15

20

25

30

35







(c) Temperature Lower Canning River (Surface)


Te

mpera

ture

(oC

)

10

15

20

25

30

35

(d) Temperature Lower Canning River (Bottom)


Te

mpera

ture

(oC

)

10

15

20

25

30

35

(a) Temperature Canning Estuary (Surface)


Te

mpera

ture

(oC

)

10

15

20

25

30

35

(b) Temperature Canning Estuary (Bottom)


Te

mpera

ture

(oC

)

10

15

20

25

30

35









Table 31 Swan Temperature (°C) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


Temperature Lower Swan Canning Estuary (Surface)

n 20 16 16 20 16 16 20 12 16 19 17 16

min 12.02 14.12 14.03 16.47 18.03 20.33 21.71 23.10 23.37 20.81 17.10 15.49

max 17.43 15.17 17.94 19.02 21.97 22.95 25.31 26.07 27.10 25.02 20.93 18.41

median 15.67 14.62 16.32 17.63 19.12 21.41 22.66 24.46 24.08 23.99 19.99 17.39

Temperature Lower Swan Canning Estuary (Bottom)

n 20 16 16 20 16 16 20 12 16 21 16 16

min 15.32 15.25 16.17 17.25 18.36 19.82 20.63 22.92 23.45 20.90 17.20 16.04

max 18.35 16.59 17.92 18.62 20.23 21.64 24.36 26.37 25.57 25.33 20.89 18.43

median 17.52 16.05 16.61 17.70 19.05 20.37 22.07 24.21 23.98 23.91 20.38 17.13

Temperature Middle Swan Estuary (Surface)

n 20 16 16 20 16 16 20 11 16 20 16 16

min 12.65 12.58 13.35 16.13 19.76 22.63 23.84 24.57 24.37 21.42 17.21 16.06

max 18.22 14.52 18.24 19.45 22.94 25.17 28.57 28.55 29.64 26.92 21.85 18.52

median 15.53 13.78 16.43 18.74 20.85 23.89 25.63 26.65 25.02 24.71 20.71 17.27

Temperature Middle Swan Estuary (Bottom)

n 20 16 16 20 16 16 21 12 16 20 16 16

min 15.17 12.70 12.93 15.87 19.61 22.69 23.67 24.69 24.42 21.36 17.72 16.06

max 18.69 15.98 17.90 20.57 22.80 24.78 27.07 27.95 28.02 26.12 21.56 18.31

median 16.56 15.39 16.49 18.27 21.31 23.58 25.37 25.96 24.81 24.76 20.61 17.25

Temperature Upper Swan Estuary (Surface)

n 20 16 16 20 16 12 20 16 16 20 16 16

min 10.89 11.57 12.43 15.42 18.78 22.79 24.78 25.70 24.82 21.78 17.81 16.20

max 16.82 13.92 17.08 18.79 23.36 24.96 27.67 29.06 29.25 26.20 21.91 18.58

median 13.86 12.85 15.53 17.48 20.74 24.23 26.16 27.12 25.64 25.09 20.71 16.73

Temperature Upper Swan Estuary (Bottom)

n 20 16 16 20 16 12 20 16 16 20 16 16

min 10.83 11.46 12.45 15.41 18.77 22.61 24.68 25.42 24.79 22.03 18.40 16.65

max 18.72 15.44 16.52 18.60 21.99 24.26 27.49 28.59 28.02 26.39 21.74 18.32

median 15.93 13.22 15.17 17.28 20.23 23.55 25.73 26.92 25.41 25.28 20.92 17.08

Temperature Swan River (Surface)

n 10 8 8 10 8 6 10 8 8 10 8 8

min 10.76 11.50 12.43 14.92 16.93 22.40 24.01 25.45 24.42 21.15 17.01 14.59

max 14.92 13.37 15.90 17.45 21.60 23.39 26.90 28.03 27.39 25.22 20.74 18.14

median 12.07 12.49 15.09 16.59 19.66 23.02 25.45 26.57 25.05 24.67 20.19 16.24

Temperature Swan River (Bottom)

n 10 8 8 10 8 6 10 8 8 10 8 8

min 10.74 11.47 12.48 15.45 18.27 22.33 23.99 25.11 24.38 21.15 19.34 16.54

max 17.38 13.37 15.94 17.52 21.45 23.39 26.42 27.84 28.00 26.04 21.61 18.20

median 12.09 12.46 15.08 16.89 19.56 22.84 25.29 26.62 25.04 24.97 20.60 16.81



Table 32 Canning Temperature (°C) (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


Temperature Canning Estuary (Surface)

n 16 20 16 16 18 15 15 15 13 18 15 16

min 12.20 12.95 11.87 15.41 16.86 19.72 21.97 23.60 22.83 19.78 17.68 13.88

max 18.90 15.41 18.55 18.36 21.82 26.53 25.86 30.51 31.11 28.26 23.27 20.65

median 16.80 14.17 15.80 16.33 19.37 23.12 23.18 26.52 24.10 23.77 19.74 17.07

Temperature Canning Estuary (Bottom)

n 16 20 16 16 18 15 15 15 13 18 15 16

min 12.22 13.23 13.40 15.31 16.65 21.70 22.12 23.70 23.84 20.13 17.55 15.05

max 19.81 16.02 19.35 20.04 23.76 27.40 27.95 30.82 30.44 26.30 22.68 20.75

median 17.71 15.43 16.66 17.73 20.05 22.95 23.33 26.19 24.46 24.00 20.37 17.37

Temperature Lower Canning River (Surface)

n 14 20 16 16 20 16 20 16 16 20 16 16

min 11.79 13.00 13.11 15.22 16.18 19.29 21.15 23.66 23.01 19.12 16.44 14.11

max 16.26 14.87 16.42 16.89 21.20 22.59 26.08 27.12 27.40 24.65 20.85 16.48

median 13.18 13.50 15.65 15.40 18.25 21.37 23.14 25.97 24.44 23.30 19.14 14.95

Temperature Lower Canning River (Bottom)

n 14 20 16 16 20 16 20 16 16 20 16 16

min 11.66 12.27 13.10 15.22 16.17 18.99 20.25 22.33 22.72 19.03 16.15 13.97

max 17.49 14.84 16.32 16.77 20.55 21.73 24.51 26.16 26.56 25.38 21.37 19.19

median 14.45 13.49 15.63 15.39 17.71 20.25 22.50 24.17 23.94 23.14 18.69 14.88



18 pH

Figure 38 2014/2015 pH (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Lower Swan Canning, Middle and Upper Swan Estuary.

(e) pH Upper Swan Estuary (Surface)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(b) pH Lower Swan Canning Estuary (Bottom)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(c) pH Middle Swan Estuary (Surface)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(d) pH Middle Swan Estuary (Bottom)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(a) pH Lower Swan Canning Estuary (Surface)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(f) pH Upper Swan Estuary (Bottom)


pH

6.5

7.0

7.5

8.0

8.5

9.0









Figure 39 2014/2015 pH (in situ) in surface and bottom water, over background (July 2009-May 2014) Salinity data, in the Swan River.

Figure 40 2014/2015 pH (in situ) in surface and bottom water, over background (June 2009-May 2014) DO data, in the Canning Estuary and Lower Canning River.

(a) pH Swan River (Surface)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(b) pH Swan River (Bottom)


pH

6.5

7.0

7.5

8.0

8.5

9.0







(c) pH Lower Canning River (Surface)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(d) pH Lower Canning River (Bottom)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(a) pH Canning Estuary (Surface)


pH

6.5

7.0

7.5

8.0

8.5

9.0

(b) pH Canning Estuary (Bottom)


pH

6.5

7.0

7.5

8.0

8.5

9.0









Table 33 Swan pH (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


pH Lower Swan Canning Estuary (Surface)

n 20 16 16 20 16 16 20 12 16 19 17 16

min 7.46 7.94 7.85 7.82 7.94 7.91 7.80 7.82 7.80 7.77 7.80 7.83

max 8.11 8.20 8.19 8.33 8.16 8.14 8.12 8.08 8.03 8.00 7.99 8.10

median 7.90 8.03 8.03 8.18 8.10 8.05 7.99 7.98 7.94 7.91 7.91 7.97

pH Lower Swan Canning Estuary (Bottom)

n 20 16 16 20 16 16 20 12 16 21 16 16

min 7.62 7.73 7.67 7.64 7.62 7.73 7.81 7.89 7.78 7.79 7.81 7.87

max 8.20 8.19 8.15 8.14 8.09 8.10 8.11 8.09 8.04 8.01 8.02 8.06

median 7.87 7.97 7.98 7.95 7.94 7.90 7.97 8.01 7.95 7.91 7.93 7.98

pH Middle Swan Estuary (Surface)

n 20 16 16 20 16 16 20 11 16 20 16 16

min 7.41 7.46 7.51 7.46 7.56 7.56 7.59 7.73 7.52 7.50 7.59 7.30

max 7.91 7.97 7.85 7.93 8.09 7.98 8.02 7.85 7.73 7.85 7.90 7.91

median 7.68 7.76 7.73 7.59 7.81 7.82 7.84 7.78 7.65 7.72 7.75 7.68

pH Middle Swan Estuary (Bottom)

n 20 16 16 20 16 16 21 12 16 20 16 16

min 7.12 7.25 7.20 7.24 7.22 7.30 7.22 7.59 7.43 7.43 7.24 7.39

max 7.83 7.73 7.79 7.58 7.70 7.82 7.89 7.79 7.71 7.75 7.78 7.88

median 7.31 7.49 7.40 7.39 7.35 7.51 7.58 7.65 7.52 7.60 7.64 7.64

pH Upper Swan Estuary (Surface)

n 20 16 16 20 16 12 20 16 16 20 16 16

min 7.23 7.37 7.38 7.16 7.24 7.25 7.28 7.29 7.26 7.21 7.20 7.18

max 7.98 7.78 7.78 7.58 7.69 7.66 7.80 7.91 7.65 7.72 7.49 8.05

median 7.58 7.67 7.60 7.47 7.32 7.40 7.41 7.45 7.38 7.38 7.35 7.30

pH Upper Swan Estuary (Bottom)

n 20 16 16 20 16 12 20 16 16 20 16 16

min 7.04 7.04 7.12 7.09 7.14 7.24 7.14 7.14 7.15 7.07 7.06 7.17

max 7.91 7.73 7.74 7.52 7.63 7.36 7.37 7.46 7.43 7.42 7.45 7.48

median 7.20 7.56 7.53 7.36 7.30 7.29 7.29 7.31 7.30 7.30 7.26 7.27

pH Swan River (Surface)

n 10 8 8 10 8 6 10 8 8 10 8 8

min 7.50 7.36 7.40 7.32 7.20 7.23 7.21 7.29 7.28 7.17 6.94 7.22

max 7.94 7.75 7.72 7.67 7.57 7.35 7.39 7.38 7.36 7.49 7.55 7.84

median 7.68 7.63 7.64 7.57 7.38 7.26 7.29 7.33 7.31 7.34 7.25 7.30

pH Swan River (Bottom)

n 10 8 8 10 8 6 10 8 8 10 8 8

min 7.04 7.41 7.55 7.31 7.23 7.24 7.25 7.26 7.16 7.10 7.01 7.18

max 7.94 7.72 7.70 7.61 7.57 7.34 7.36 7.33 7.34 7.35 7.24 7.41

median 7.58 7.63 7.63 7.50 7.34 7.25 7.28 7.30 7.29 7.25 7.18 7.23



Table 34 Canning pH (in situ) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


pH Canning Estuary (Surface)

n 16 20 16 16 18 15 15 15 13 18 15 16

min 6.93 7.22 7.15 7.45 7.20 7.38 7.61 7.43 7.10 6.90 7.17 7.05

max 8.00 7.85 8.02 8.28 8.17 7.94 7.93 7.99 7.76 7.69 7.74 7.84

median 7.59 7.67 7.73 7.71 7.78 7.81 7.76 7.63 7.58 7.59 7.49 7.56

pH Canning Estuary (Bottom)

n 16 20 16 16 18 15 15 15 13 18 15 16

min 7.09 7.14 7.11 6.98 7.08 7.26 7.29 7.43 6.97 7.02 7.13 7.05

max 7.75 7.77 7.78 7.84 7.88 7.96 7.94 7.85 7.79 7.75 7.76 7.76

median 7.50 7.46 7.45 7.62 7.67 7.73 7.75 7.60 7.55 7.59 7.52 7.58

pH Lower Canning River (Surface)

n 14 20 16 16 20 16 20 16 16 20 16 16

min 6.99 7.15 7.27 7.28 7.33 7.32 7.27 7.41 7.21 7.21 7.30 7.16

max 8.10 7.87 8.21 7.89 7.86 7.93 8.13 8.46 8.16 8.20 8.47 8.55

median 7.30 7.38 7.54 7.51 7.48 7.54 7.52 7.80 7.75 7.66 7.67 7.54

pH Lower Canning River (Bottom)

n 14 20 16 16 20 16 20 16 16 20 16 16

min 6.93 7.11 7.26 7.27 7.23 7.16 7.02 7.10 7.08 7.07 7.18 7.07

max 7.86 7.52 7.93 7.55 7.59 7.78 7.77 8.13 7.64 7.80 8.09 7.96

median 7.15 7.31 7.43 7.36 7.40 7.38 7.39 7.48 7.32 7.39 7.48 7.34



19 Secchi Depth

Figure 41 2014/2015 Secchi Disc depth (m) over background (June 2009-May 2014) Secchi Disc depth data, in the Lower Swan Canning, Middle, Upper Swan Estuary and the Swan River.

(d) Secchi Depth Swan River


De

pth

(m

)

0

1

2

3

4

5

6

(a) Secchi Depth Lower Swan Canning Estuary


De

pth

(m

)

0

1

2

3

4

5

6

(c) Secchi Depth Upper Swan Estuary


De

pth

(m

)

0

1

2

3

4

5

6

(b) Secchi Depth Middle Swan Estuary


De

pth

(m

)

0

1

2

3

4

5

6









Table 35 Swan Secchi Disc depth (m) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


Secchi Depth Lower Swan Canning Estuary

n 20 15 16 20 16 16 20 16 12 20 16 16

min 1.5 1.2 1.2 0.8 1.0 1.2 1.3 1.2 1.1 1.0 1.4 1.5

max 5.3 5.4 4.2 3.5 4.0 4.5 5.1 4.4 4.3 8.0 8.4 6.2

median 3.3 3.0 2.5 2.2 2.8 3.0 3.2 3.2 2.8 3.3 4.0 4.5

Secchi Depth Middle Swan Estuary

n 24 20 20 20 16 16 20 16 12 20 16 16

min 0.9 0.7 1.0 0.6 0.7 0.7 0.6 0.9 0.9 1.2 1.1 0.5

max 3.0 1.8 2.0 1.7 1.8 1.8 1.8 1.8 1.8 2.3 2.5 2.8

median 1.4 1.3 1.2 0.9 1.3 1.2 1.3 1.4 1.6 1.6 1.6 2.0

Secchi Depth Upper Swan Estuary

n 16 16 16 20 16 16 20 16 16 20 16 15

min 0.8 0.5 0.9 0.5 0.8 0.5 0.6 0.6 0.7 1.0 1.3 0.5

max 1.4 1.4 1.4 1.0 1.2 1.6 1.6 1.5 1.5 1.5 2.2 2.2

median 1.1 1.2 1.0 1.0 1.1 1.0 1.0 1.0 1.1 1.2 1.5 1.2

Secchi Depth Swan River

n 8 8 8 10 8 8 10 8 8 10 8 8

min 0.8 0.5 0.8 0.5 0.8 1.1 1.1 1.4 1.0 1.3 1.3 1.2

max 1.3 1.2 1.3 0.9 1.2 1.6 1.6 1.6 1.7 1.8 1.8 2.0

median 1.0 1.1 1.1 0.9 1.1 1.3 1.5 1.5 1.4 1.6 1.7 1.8



Figure 42 2014/2015 Secchi Disc depth (m) over background (June 2009-May 2014) Secchi Disc depth data, in the Canning Estuary and Lower Canning River.

(a) Secchi Depth Canning Estuary


De

pth

(m

)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

(b) Secchi Depth Lower Canning River


De

pth

(m

)

0.0

0.5

1.0

1.5

2.0

2.5

3.0






Table 36 Canning Secchi Disc depth (m) monthly sample numbers (n), minimum, maximum and median values for 2014/2015.


Secchi Depth Canning Estuary

n 15 20 16 16 18 13 15 15 13 14 15 16

min 0.7 0.4 0.4 0.6 0.5 0.4 0.6 0.6 0.8 1.0 0.9 0.4

max 3.8 2.6 2.5 2.1 2.4 2.4 3.0 2.0 3.0 4.0 3.8 3.0

median 1.5 0.9 1.3 0.9 1.2 0.9 1.3 1.3 1.6 1.9 1.9 1.3

Secchi Depth Lower Canning River

n 14 20 16 16 19 13 19 16 16 14 16 16

min 0.4 0.3 0.5 0.5 0.4 0.5 0.6 0.7 0.4 0.9 0.4 0.3

max 1.5 1.1 0.8 0.9 1.0 1.0 1.4 1.7 1.2 1.4 1.2 1.3

median 1.1 0.6 0.7 0.6 0.8 0.8 1.0 1.2 1.0 1.1 1.0 1.0



20 Phytoplankton

Figure 43 Swan 2009 integrated Phytoplankton (cells/mL).



Figure 44 Swan June 2009-May 2010 integrated Phytoplankton (cells/mL).












Figure 48 Swan June 2013-May2014 integrated Phytoplankton (cells/mL).



Figure 49 Swan June 2014-May2015 integrated Phytoplankton (cells/mL).



Figure 50 Canning 2009 integrated Phytoplankton (cells/mL).



Figure 51 Canning June 2009-May 2010 integrated Phytoplankton (cells/mL).
















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Swan-Canning Estuarine Data Report - Home - Parks and ...€¦ · Table 30 Canning Salinity (ppt) (in situ) monthly sample numbers (n), minimum, maximum ... Swan-Canning Estuarine