FRASER-LOWER MAINLAND WATERSHED REPORT · 2020. 10. 15. · OVERALL HYDROLOGY RIVER HEALTH SCORING Basin Hydrology Indicator 08J - Nechako 08K - Upper Fraser 08L - Thompson 08M -

WWF-Canada Freshwater Watershed Report for the Fraser Mainland Watershed

Disclaimer: This analysis reflects currently accessible and available data that aligns with our nationally consistent suite of indicators, as of March 2020.

FRASER-LOWER MAINLAND WATERSHED REPORT

CONTENTS

SUMMARY ...................................................................................................................................................................................................................................... 1

Overall River Health Scoring ......................................................................................................................................................................................................... 1

Overall Data Sufficiency Scoring ................................................................................................................................................................................................... 1

HYDROLOGY ................................................................................................................................................................................................................................... 2

Overall Hydrology River Health Scoring ........................................................................................................................................................................................ 2

Hydrology Data Sufficiency ........................................................................................................................................................................................................... 3

Long-Term Trends in Monthly Flow for the Fraser Lower MainlandWatershed .......................................................................................................................... 4

Recent-Term Trends in Monthly Flow for the Fraser Lower MainlandWatershed..................................................................................................................... 11

Trends in Annual Flow for the Fraser Lower MainlandWatershed ............................................................................................................................................. 22

Hydrological Alteration in the Fraser Lower MainlandWatershed ............................................................................................................................................. 31

WATER QUALITY ......................................................................................................................................................................................................................... 47

Overall Water Quality Health Scoring ......................................................................................................................................................................................... 47

Water Quality Data Sufficiency ................................................................................................................................................................................................... 47

FISH ................................................................................................................................................................................................................................................ 55

Overall Fish Health Scoring ......................................................................................................................................................................................................... 55

Fish Data Sufficiency ................................................................................................................................................................................................................... 55

BENTHICS ...................................................................................................................................................................................................................................... 62

Overall Benthic Health Scoring ................................................................................................................................................................................................... 62

Benthic Data Sufficiency ............................................................................................................................................................................................................. 62

FRESHWATER THREATS ASSESSMENT ................................................................................................................................................................................................ 66

SUMMARY ...................................................................................................................................................................................................................................... 66

SUB-INDICATOR SCORES BY SUB-WATERSHED ............................................................................................................................................................................... 67

Pollution...................................................................................................................................................................................................................................... 67

Climate Change ........................................................................................................................................................................................................................... 67

Alteration of Water Flows .......................................................................................................................................................................................................... 68

Invasive Species .......................................................................................................................................................................................................................... 68

Water Use ................................................................................................................................................................................................................................... 68

Fragmentation ............................................................................................................................................................................................................................ 68

Habitat Loss ................................................................................................................................................................................................................................ 68

1 WWF-Canada Freshwater Watershed Report for the Fraser Mainland Watershed


SUMMARY

OVERALL RIVER HEALTH SCORING

Sub-Basin

Basin

Overall River

Health

Indicator 08J -

Nechako

08K - Upper Fraser

08L - Thompson

08M - Lower Fraser

08P - Skagit

Hydrology

Hydrology Health Category

Good Good Good Good Data

Deficient Good

Hydrology Score 4 4 4 4 0 4

Water Quality

Water Quality Health Category

Data Deficient

Good Fair Poor Data

Deficient Fair

Water Quality Health Score

0 4 3 2 0 3

Benthic Macro-Invertebrates

Benthic Health Category Data

deficient Very Good Very Good Very Good

Data Deficient

Very Good

Benthic Health Score 0 5 5 5 0 5

Fish Fish Health Category Good Good Good Good Good Good

Fish Health Score 4 4 4 4 4 4

Total Score 8 17 16 15 4 16

Total Available Score 10 20 20 20 5 20

Percentage of Maximum Score 80.0% 85.0% 80.0% 75.0% 80.0% 80.0%

Overall Health Category Data

deficient Very Good Good Good

Data Deficient

Good

OVERALL DATA SUFFICIENCY SCORING

Sub-Basin

Basin

Overall River

Health

Indicator 08J -

Nechako 08K - Upper

Fraser 08L -

Thompson 08M - Lower

Fraser 08P - Skagit

Hydrology

Data Sufficiency Category

Partially Sufficient


Sufficient Moderately

Sufficient Insufficient

Moderately Sufficient

Data Sufficiency

Score 1 1 3 2 0 2

Water Quality


Insufficient Partially

Sufficient Partially




Data Sufficiency

Score 0 1 1 1 0 1

Benthic Macro-

Invertebrates







Data Sufficiency

Score 0 1 1 1 0 1

Fish


Sufficient Sufficient Partially


Sufficient Moderately

Sufficient Sufficient

Data Sufficiency

Score 3 3 1 1 2 3

Total Score 4 6 6 5 2 7

Total Available Score 12 12 12 12 12 12

Percentage of Maximum Score

33.3% 50.0% 50.0% 41.7% 16.7% 58.3%

Overall Data Sufficiency Category





Insufficient Moderately Sufficient



HYDROLOGY

OVERALL HYDROLOGY RIVER HEALTH SCORING

Basin

Hydrology

Indicator 08J - Nechako 08K - Upper

Fraser 08L -


Fraser 08P - Skagit

Long-Term Trends in

Monthly Flow

Average percentage (%) change in median monthly

flow, measured as the relative change in median

monthly flow per year, reported as an average

across studied stations and weighted by the median annual flow per station.

Period of Study

1915-2017 1915-2017 1911-2017 1911-2018 - 1911-2018

Number of Stations

3 3 7 6 0 19

Value 0.88 0.09 0.14 0.16 Data

Deficient 0.25

Health Category

Good Very Good Good Good Data

Deficient Good

Health Score 4 5 4 4 0 4

Recent-Term Trends in

Monthly Flow

Average percentage (%) change in median monthly

flow, measured as the relative change in median

monthly flow per year, reported as an average

across studied stations and weighted by the median annual flow per station.

Period of Study

1998-2018 1977-2018 1984-2018 1996-2018 - 1977-2018

Number of Stations

6 19 37 37 0 99

Value 0 0.02 0.05 0.07 Data

Deficient 0.05

Health Category

Very Good Very Good Very Good Very Good Data

Deficient Very Good


Long-Term Trends in

Annual Flow

Average percentage change (%) in median annual flow,

reported as an average across studied stations and

weighted by the median annual flow per station.

Period of Study

1915-2017 1915-2017 1911-2017 1911-2018 - 1911-2018

Number of Stations

3 3 7 6 0 19

Value 0 0 0 -0.52 Data

Deficient -0.16

Health Category

Very Good Very Good Very Good Very Good Data

Deficient Very Good


Pre- vs. Post-Dam or Recent vs. Historical Analysis of

Monthly Flow

Percentage (%) of total months, for all stations

analyzed, with significantly different variance in

monthly flow pre- vs. post-dam operation or for

historical vs. Recent time periods in undammed

systems.

Period of Study

1915-2017 1915-2017 Various Various - Various

Number of Stations

3 3 2 7 0 15

Value 88.89 58.33 62.75 74.33 Data

Deficient 72.50

Health Category

Very Poor Poor Very Poor Very Poor Data

Deficient Very Poor


Percentage (%) change in median monthly flow pre-

and post-dam or for historical vs. Recent time

periods in undammed systems, averaged across studied stations by mean

annual flow.

Period of Study

1915-2018 1915-2017 Various Various - Various

Number of Stations

3 3 5 7 0 18

Value 24.61 8.61 30.04 14.84 Data

Deficient 12.52

Health Category

Good Very Good Fair Good Data

Deficient Good


Hydrology Score

Total Score 19 22 18 20 - 19

Maximum Available

Score 25 25 25 25 0 25

Percentage (%) of

Maximum Score

76.00 88.00 72.00 80.00 0.00 76.00

Hydrology Health

Category Good Good Good Good

Data Deficient

Good

Hydrology Score

4 4 4 4 0 4



HYDROLOGY DATA SUFFICIENCY

Fraser - Lower Mainland

Basin Data Sufficiency Indicator

08J - Nechako

08K - Upper Fraser

08L - Thompson

08M - Lower Fraser

08P - Skagit

Total number of sub-sub-basins 5 8 7 8 1 29

Total number of dams (>10m) 3 1 6 11 0 21

Year of earliest dam operation 1952 1900 1915 1912 - 1912

Year of earliest available continuous flow monitoring

1915 1915 1911 1911 - 1911

Number of monitoring stations available for earliest, continuous

flow monitoring 1 1 8 4 0 14

Number of sub-sub-basins with monitoring stations

1 1 5 2 0 9

Number of monitoring stations on river downstream of dams

0 0 1 1 0 2

Data Sufficiency Category Insufficient Insufficient Moderately Sufficient



Sufficient

Year of long-term continuous flow monitoring

1950 1964 1967 1974 - 1974

Number of monitoring stations available for continuous flow

monitoring analysis 5 14 29 29 0 77


3 6 7 7 0 23


0 0 3 6 0 9

Data Sufficiency Category Partially






Year of widespread, continuous flow monitoring

1998 1977 1964 1996 - 1998

Number of monitoring stations available for continuous flow

monitoring analysis 11 19 25 37 0 92


4 7 7 7 0 25


0 0 3 6 0 9

Data Sufficiency Category Partially





Overall Data Sufficiency Category Partially





Data Sufficiency Score 1 1 3 2 0 2



LONG-TERM TRENDS IN MONTHLY FLOW FOR THE FRASER LOWER MAINLANDWATERSHED

MAP. RESULTS OF A SERIES OF LONG-TERM TREND ANALYSES OF MEDIAN MONTHLY FLOW IN THE FRASER LOWER MAINLANDWATERSHED FOR THE PERIOD 1911-2019.



TABLE. RESULTS OF LONG-TERM TREND ANALYSES FOR MEDIAN MONTHLY FLOW IN THE NECHAKO SUB-WATERSHED.

08J - Nechako

08JB002 08JC001 08JE001

Start Year for Analysis 1929 Start Year for Analysis 1915 Start Year for Analysis 1929

Median Annual Flow (m3/s) 11.33 Median Annual Flow (m3/s) 114.22 Median Annual Flow (m3/s) 92.24

Month Theil-Sen Slope Mann-Kendall p-value

Average Median

Monthly Flow

Average Percentage Change in Median Monthly

Flow*

Theil-Sen Slope Mann-Kendall

p-value Average Median

Monthly Flow

Average Percentage

Change in Median Monthly Flow*

Theil-Sen Slope

Mann-Kendall p-value

Average Median

Monthly Flow


Flow*

January -0.03 0.16 8.07 -1.55 0.00 *** 66.03 2.35 -0.02 0.84 65.96

February -0.03 0.16 7.66 -1.60 0.00 *** 64.04 2.51 0.04 0.52 55.22

March -0.02 0.14 7.05 -1.63 0.00 *** 67.45 2.41 0.09 0.08 46.29

April 0.00 0.75 8.87 -1.66 0.00 *** 113.88 1.45 0.19 0.00 ** 49.00 0.38

May 0.22 0.13 40.75 -1.65 0.00 *** 236.05 0.70 0.81 0.00 *** 130.12 0.62

June -0.17 0.34 62.88 -1.63 0.00 *** 241.36 0.68 0.93 0.02 * 281.36 0.33

July -0.11 0.17 41.49 -1.63 0.00 *** 235.47 0.69 0.63 0.08 296.81

August -0.12 0.00 ** 24.41 0.51 -1.64 0.00 *** 229.25 0.71 0.23 0.26 207.38

September -0.08 0.00 *** 14.73 0.57 -1.77 0.00 *** 119.24 1.48 0.07 0.61 135.72

October -0.05 0.00 ** 10.50 0.45 -1.77 0.00 *** 109.28 1.62 0.03 0.81 96.24

November -0.02 0.24 9.91 -1.80 0.00 *** 101.28 1.78 0.07 0.50 83.22

December -0.02 0.34 8.89 -1.82 0.00 *** 72.69 2.51 0.06 0.71 75.86

Average for all

months, for each station

-0.04 20.43 0.13 -1.68 138.00 1.57 0.26 126.93 0.11

Average percentage change in median monthly flow for all months, weighted by median

annual flow 0.88

* Percentage change in median monthly flow is only calculated for months with a statistically significant trend over time. For months

without a significant trend, a value of zero is assigned for calculation of the overall station score.



TABLE. RESULTS OF LONG-TERM TREND ANALYSES FOR MEDIAN MONTHLY FLOW IN THE UPPER FRASER SUB-WATERSHED.

08K - Upper Fraser

08KA001 08KH001 08KH006




Average Median

Monthly Flow

Average Percentage Change in Median

Monthly Flow* Theil-Sen Slope


Average Median Monthly Flow


Flow*

Theil-Sen Slope

Mann-Kendall p-

value

Average Median

Monthly Flow


Monthly Flow*

January 0.00 0.70 1.93 0.04 0.52 44.75 0.17 0.09 74.95

February 0.00 0.17 1.63 0.07 0.06 38.14 0.18 0.03 * 68.45 0.26

March 0.00 0.74 1.61 0.10 0.00 ** 34.71 0.30 0.29 0.00 *** 68.52 0.43

April 0.01 0.10 2.62 0.23 0.01 ** 52.04 0.43 0.89 0.00 ** 131.41 0.68

May 0.11 0.12 17.09 0.42 0.11 179.52 1.17 0.06 391.40

June 0.01 0.91 41.40 0.42 0.12 347.59 1.02 0.15 628.81

July -0.13 0.16 39.49 0.30 0.32 300.16 0.44 0.47 504.73

August -0.10 0.09 26.60 0.00 0.98 178.99 -0.60 0.12 303.24

September -0.01 0.92 12.88 -0.07 0.57 119.90 -0.26 0.27 211.72

October -0.02 0.49 7.40 -0.05 0.73 95.21 -0.15 0.55 172.07

November -0.01 0.41 4.14 0.13 0.25 82.62 0.35 0.12 143.40

December -0.01 0.30 2.52 0.06 0.43 60.12 0.21 0.13 98.36

Average for all


-0.01 13.28 0.00 0.14 127.81 0.06 0.31 233.09 0.11

Average percentage change in median monthly flow for all months, weighted by

median annual flow 0.09

* Percentage change in median monthly flow is only calculated for months with a statistically significant trend over time. For months without a significant trend, a value of zero is assigned for calculation of the overall station score.



TABLE. RESULTS OF LONG-TERM TREND ANALYSES FOR MEDIAN MONTHLY FLOW IN THE THOMPSON SUB-WATERSHED.

08L - Thompson

08LD001 08LE020 08LF002 08LG006

Start Year for Analysis 1911 Start Year for Analysis 1911 Start Year for Analysis 1911 Start Year for Analysis 1911

Median Annual Flow (m3/s) 46.99 Median Annual Flow (m3/s) 1.34 Median Annual Flow (m3/s) 3.16 Median Annual Flow (m3/s) 11.52

Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median

Monthly Flow

Average Percentage


Theil-Sen Slope



Average Percentage Change in

Median Monthly Flow*

Theil-Sen Slope


Average Median

Monthly Flow



Theil-Sen Slope


Average Median

Monthly Flow



January 0.07 0.00 ** 21.44 0.31 0.00 0.29 0.93 0.00 0.93 2.04 0.00 0.94 8.61

February 0.05 0.00 ** 17.95 0.26 0.00 0.43 0.97 0.00 0.58 2.31 -0.05 0.18 9.71

March 0.03 0.05 * 17.55 0.18 0.00 0.12 1.27 -0.01 0.59 3.00 0.01 0.83 12.62

April 0.03 0.53 32.88 0.04 0.00 *** 2.94 1.50 0.03 0.31 5.88 0.02 0.81 26.20

May -0.19 0.18 112.27 0.05 0.06 10.53 0.05 0.59 15.67 -0.20 0.45 87.63

June 0.21 0.13 201.91 -0.01 0.58 7.38 0.05 0.49 15.03 -0.50 0.03 * 82.36 0.61

July 0.08 0.49 159.48 -0.02 0.00 ** 2.56 0.81 -0.04 0.38 8.54 -0.18 0.03 * 26.78 0.68

August 0.07 0.34 93.29 -0.02 0.00 *** 1.19 1.30 0.00 0.84 4.07 -0.03 0.14 8.31

September -0.04 0.41 65.37 -0.01 0.00 *** 1.08 0.94 0.02 0.17 3.13 -0.02 0.12 5.91

October 0.05 0.28 47.81 -0.01 0.00 ** 1.17 0.51 0.01 0.13 2.67 0.00 0.80 7.03

November 0.10 0.07 40.13 0.00 0.17 1.25 0.00 0.67 2.37 0.04 0.15 10.95

December 0.09 0.01 * 29.59 0.29 0.00 0.06 1.03 0.00 0.41 2.06 0.02 0.31 8.32

Average for all months,

for each station

0.04 69.97 0.09 0.00 2.69 0.42 0.01 5.56 0.00 -0.07 24.54 0.11



08L - Thompson

08LA001 08LB020 08LC002




Average Median

Monthly Flow

Average Percentage


Theil-Sen Slope Mann-Kendall p-value

Average Median

Monthly Flow

Average Percentage


Theil-Sen Slope


Average Median

Monthly Flow

Average Percentage


January 0.00 0.94 50.23 0.00 0.66 3.46 0.11 0.03 * 34.78 0.32

February 0.02 0.62 45.37 0.01 0.07 3.32 0.21 0.00 *** 34.44 0.61

March 0.09 0.05 * 45.56 0.19 0.01 0.11 3.94 0.38 0.00 *** 38.34 0.99

April 0.51 0.00 ** 89.41 0.57 0.14 0.00 *** 11.29 1.22 0.50 0.00 *** 70.55 0.71

May 0.95 0.15 428.65 0.02 0.78 45.83 -0.24 0.41 182.85

June -0.03 0.98 708.33 -0.10 0.28 51.12 -0.16 0.64 286.16

July -0.97 0.10 498.15 -0.06 0.21 18.96 -0.34 0.30 161.79

August -1.11 0.00 *** 271.43 0.41 -0.02 0.17 6.17 -0.17 0.02 * 61.77 0.28

September -0.47 0.04 * 174.36 0.27 -0.01 0.38 4.78 -0.08 0.21 47.52

October -0.17 0.39 132.57 -0.01 0.28 5.31 0.00 0.91 45.26

November 0.24 0.14 101.50 0.01 0.23 5.57 0.11 0.11 47.35

December 0.00 0.97 65.13 0.00 0.62 4.05 0.08 0.15 39.60

Average for all


-0.08 217.56 0.12 0.00 13.65 0.10 0.03 87.53 0.24

Average percentage change in median monthly flow for all months, weighted by median

annual flow 0.14




TABLE. RESULTS OF LONG-TERM TREND ANALYSES FOR MEDIAN MONTHLY FLOW IN THE LOWER FRASER SUB-WATERSHED.

08M - Lower Fraser 08MF005 08MG001 08MH001


Median Annual Flow (m3/s) 1,867.42 Median Annual Flow (m3/s) 27.17 Median Annual Flow (m3/s) 51.43

Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median

Monthly Flow

Average Percentage


Theil-Sen Slope



Average Percentage


Theil-Sen Slope


Average Median

Monthly Flow



January 1.59 0.04 * 917.32 0.17 0.34 0.10 32.45 0.13 0.14 49.53

February 1.67 0.01 ** 877.01 0.19 -0.20 0.14 29.95 0.04 0.53 47.08

March 3.44 0.00 *** 872.38 0.39 0.30 0.04 * 31.45 0.95 0.23 0.00 *** 42.81 0.55

April 9.39 0.00 *** 1704.87 0.55 0.06 0.68 40.03 0.14 0.10 54.12

May 4.12 0.35 4858.19 0.18 0.29 46.74 -0.04 0.75 105.14

June -4.65 0.27 6959.14 0.08 0.62 36.72 -0.16 0.41 129.96

July -7.14 0.08 5494.19 -0.06 0.42 18.89 -0.25 0.12 90.69

August -5.69 0.01 ** 3429.24 0.17 -0.04 0.21 8.79 -0.12 0.03 * 42.22 0.29

September -3.33 0.05 * 2275.24 0.15 -0.01 0.90 9.20 -0.09 0.04 * 30.77 0.30

October 0.64 0.68 1869.75 0.16 0.33 22.97 -0.01 0.90 38.48

November 4.16 0.01 ** 1575.84 0.26 0.26 0.35 47.28 0.22 0.03 * 58.21 0.37

December 1.13 0.23 1094.80 -0.18 0.31 32.48 0.05 0.50 53.56

Average for all months, for each station

0.44 2660.66 0.16 0.07 29.75 0.08 0.01 61.88 0.13



08M - Lower Fraser

08MA001 08MA002 08ME002




Average Median

Monthly Flow


Flow*

Theil-Sen Slope Mann-Kendall p-value


Average Percentage


Theil-Sen Slope


Average Median

Monthly Flow


Flow*

January -0.04 0.18 23.42 0.00 0.97 13.73 -0.06 0.00 *** 3.54 1.62

February -0.02 0.54 19.81 0.01 0.50 10.81 -0.05 0.00 *** 3.35 1.51

March -0.04 0.07 18.62 0.01 0.68 9.29 -0.05 0.00 *** 3.46 1.52

April -0.03 0.22 20.17 0.00 0.95 9.17 -0.08 0.00 *** 5.03 1.63

May -0.11 0.33 62.06 0.00 0.95 20.76 -0.25 0.00 ** 20.31 1.23

June 0.08 0.57 185.72 0.07 0.47 77.93 -0.46 0.00 ** 46.52 0.98

July 0.24 0.22 232.49 0.11 0.27 113.65 -0.69 0.00 *** 34.70 1.99

August -0.27 0.03 * 212.76 0.13 -0.05 0.48 107.47 -0.31 0.00 *** 12.04 2.57

September -0.41 0.00 *** 127.74 0.32 -0.20 0.00 *** 68.49 0.29 -0.14 0.00 *** 6.12 2.31

October -0.15 0.04 * 69.11 0.21 -0.10 0.02 * 41.49 0.23 -0.10 0.00 *** 4.87 2.02

November 0.00 0.96 44.68 -0.03 0.39 28.43 -0.08 0.00 ** 4.52 1.73

December -0.03 0.37 30.16 -0.02 0.27 19.36 -0.08 0.00 *** 4.05 1.99

Average for all


-0.06 87.23 0.05 -0.02 43.38 0.04 -0.20 12.38 1.76

Average percentage change in median monthly flow for all months, weighted by median annual

flow 0.16




RECENT-TERM TRENDS IN MONTHLY FLOW FOR THE FRASER LOWER MAINLANDWATERSHED

MAP. RESULTS OF A SERIES OF TREND ANALYSES OF MEDIAN MONTHLY FLOW IN FRASER LOWER MAINLANDWATERSHED FOR THE PERIOD 1977-2019.



TABLE. RESULTS OF RECENT-TERM TREND ANALYSES FOR MEDIAN MONTHLY FLOW IN THE NECHAKO SUB-WATERSHED.

08J - Nechako

08JB013 08JC001 08JE004



Month Theil-Sen Slope Mann-Kendall


Monthly Flow






Flow*

Theil-Sen Slope


Average Median

Monthly Flow

Average Percentage


January 0.00 0.10 0.02 0.41 0.72 54.39 0.01 0.38 0.74

February 0.00 0.07 - 0.37 0.65 52.97 0.01 0.38 0.68

March 0.00 0.14 0.35 0.27 0.58 53.75 0.01 0.33 1.73

April 0.00 0.10 0.11 0.25 0.67 104.12 0.01 0.35 7.11

May 0.00 0.13 0.28 0.23 0.63 217.80 0.01 0.28 10.17

June 0.00 0.21 0.06 0.27 0.72 229.22 0.00 0.58 2.25

July 0.00 0.60 0.03 0.20 0.87 222.30 0.00 0.72 0.92

August 0.00 0.72 0.01 0.20 0.82 255.60 0.00 0.82 0.50

September 0.00 1.00 0.01 0.37 0.67 62.59 0.00 0.87 0.62

October 0.00 0.90 0.02 0.33 0.70 74.15 0.00 1.00 1.09

November 0.00 0.75 0.03 0.39 0.67 74.50 0.00 0.92 1.86

December 0.00 0.72 0.02 0.46 0.67 60.84 0.00 0.97 0.93


0.00 0.09 0.00 0.31 121.85 0.00 0.00 2.38 0.00

08J - Nechako

08JA015 08JA029 08JB002














Monthly Flow*

January -0.01 0.65 0.76 0.00 0.65 0.03 0.07 0.58 7.70

February -0.02 0.65 0.57 0.00 0.90 0.03 0.06 0.63 7.52

March 0.00 1.00 0.59 0.00 0.67 0.03 0.06 0.67 7.12

April 0.00 1.00 0.98 0.00 0.53 0.04 0.05 0.58 10.64

May 0.01 0.53 8.17 0.00 0.83 0.33 0.06 0.67 45.48

June -0.01 0.83 15.85 0.00 1.00 0.38 0.06 0.54 63.61

July 0.02 0.57 11.79 0.00 1.00 0.16 0.06 0.50 39.93

August 0.05 0.29 6.64 0.00 0.49 0.06 0.06 0.46 21.90

September 0.05 0.17 4.53 0.00 0.53 0.05 0.10 0.46 12.74

October 0.03 0.26 3.53 0.00 0.47 0.09 0.09 0.54 9.31

November 0.04 0.24 2.05 0.00 0.43 0.07 0.10 0.54 9.97

December 0.03 0.49 1.07 0.00 0.65 - 0.10 0.56 8.91


for each station

0.02 4.71 0.00 0.00 0.12 0.00 0.07 20.40 0.00

Average percentage change in median monthly flow for all months, weighted by median annual flow 0.00




TABLE. RESULTS OF RECENT-TERM TREND ANALYSES FOR MEDIAN MONTHLY FLOW IN THE UPPER FRASER SUB-WATERSHED.

08K - Upper Fraser

08KA001 08KA004 08KA005





Monthly Flow










Monthly Flow*

January 0.00 0.67 1.97 0.17 0.55 101.68 0.16 0.01 * 34.17 0.48

February 0.00 0.99 1.69 0.05 0.82 94.87 0.11 0.07 30.26

March 0.00 0.82 1.61 -0.53 0.18 104.02 -0.01 0.84 31.71

April 0.01 0.33 2.76 -1.66 0.21 230.60 -0.01 0.97 53.83

May 0.16 0.17 17.64 3.06 0.39 740.71 2.39 0.08 226.40

June 0.14 0.27 40.57 5.00 0.19 1267.33 -0.06 1.00 555.43

July 0.05 0.74 37.93 1.00 0.77 940.00 -1.64 0.30 511.14

August -0.06 0.55 25.19 -2.00 0.21 547.55 -0.74 0.32 344.52

September 0.01 0.92 12.59 -0.08 0.98 381.38 -0.16 0.79 191.83

October 0.00 0.88 7.12 1.46 0.30 302.87 0.15 0.60 116.27

November 0.00 0.86 3.96 1.53 0.07 211.92 0.46 0.07 74.26

December 0.00 0.66 2.49 0.68 0.13 118.84 0.08 0.63 47.08


for each station

0.03 12.96 0.00 0.72 420.15 0.00 0.06 184.74 0.04

08K - Upper Fraser

08KA007 08KA009 08KB001





Monthly Flow






Flow*

Theil-Sen Slope


Average Median

Monthly Flow

Average Percentage


January 0.01 0.25 7.12 0.00 0.91 1.42 0.44 0.48 191.97

February 0.00 0.93 5.94 0.00 0.85 1.22 0.21 0.86 183.26

March 0.00 0.97 5.46 0.00 0.88 1.16 -1.48 0.14 213.37

April 0.04 0.24 7.37 0.00 0.67 1.85 0.43 0.92 644.68

May 0.21 0.52 48.12 0.14 0.16 13.24 10.00 0.18 1614.29

June -0.29 0.41 147.57 0.05 0.71 30.74 8.46 0.34 2043.95

July -0.85 0.07 122.11 -0.04 0.61 18.86 1.60 0.77 1447.37

August -0.75 0.00 *** 71.08 1.05 -0.04 0.26 7.71 -2.26 0.42 839.53

September -0.19 0.27 43.21 -0.01 0.83 5.96 0.20 0.98 625.11

October 0.09 0.41 25.73 0.02 0.30 4.99 2.41 0.37 561.74

November 0.11 0.06 15.23 0.01 0.42 2.95 2.94 0.19 418.26

December 0.03 0.12 9.60 0.00 0.60 1.90 0.94 0.35 242.34


-0.13 42.38 0.09 0.01 7.67 0.00 1.99 752.16 0.00



08K - Upper Fraser

08KB003 08KC001 08KD006 08KD007



Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median Monthly

Flow



Theil-Sen Slope



Flow


Monthly Flow*

Theil-Sen Slope



Flow


Monthly Flow*

Theil-Sen Slope



Flow



January 0.09 0.54 42.94 0.03 0.68 7.83 0.00 1.00 10.30 0.06 0.29 21.13

February 0.11 0.32 39.39 0.05 0.37 7.40 -0.02 0.91 9.75 0.02 0.82 20.16

March 0.03 0.95 46.47 0.08 0.26 10.83 -0.12 0.22 14.41 0.01 0.92 25.62

April 0.01 0.96 117.74 1.15 0.07 77.60 -0.48 0.43 49.27 0.52 0.42 68.34

May 1.41 0.49 425.56 0.28 0.68 109.37 0.43 0.63 118.87 1.20 0.12 173.53

June 0.00 0.99 533.60 0.54 0.18 38.74 -0.40 0.57 73.09 0.19 0.87 161.54

July -1.38 0.35 336.34 0.06 0.51 13.19 -0.19 0.62 32.86 -0.19 0.63 77.49

August -1.32 0.02 * 198.15 0.67 0.09 0.12 6.29 -0.10 0.31 15.71 -0.14 0.44 35.46

September -0.20 0.85 170.57 0.05 0.34 6.02 -0.06 0.64 15.90 -0.01 0.96 41.27

October 0.30 0.69 157.05 0.07 0.18 9.05 0.19 0.41 21.59 0.30 0.33 47.28

November 0.17 0.74 102.92 0.13 0.31 13.25 0.16 0.28 22.49 0.39 0.08 43.52

December -0.07 0.73 58.32 0.09 0.17 8.89 0.05 0.27 13.19 0.14 0.19 26.18


for each station

-0.07 185.76 0.06 0.22 25.71 0.00 -0.04 33.12 0.00 0.21 61.79 0.00

08K - Upper Fraser

08KH006 08KH010 08KH019 08KH020 08KB006

Start Year for Analysis 1977 Start Year for Analysis 1977 Start Year for Analysis 1977 Start Year for Analysis 1977 Start Year for Analysis 1977

Median Annual Flow (m3/s) 163.21 Median Annual Flow (m3/s) 9.52 Median Annual Flow (m3/s) 1.35 Median Annual Flow (m3/s) 2.59 Median Annual Flow (m3/s) 2.62

Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median

Monthly Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Flow*

Theil-Sen Slope



Flow


Flow*

Theil-Sen Slope



Flow


Flow*

January 0.19 0.47 78.60 0.00 0.93 4.23 0.00 0.96 0.98 0.00 0.67 1.78 0.00 0.69 0.68

February 0.11 0.55 73.21 -0.01 0.54 3.83 0.00 0.82 0.93 0.00 0.99 1.86 0.00 0.56 0.52

March 0.08 0.74 75.91 -0.02 0.23 4.78 0.00 0.57 1.51 0.00 0.99 2.17 0.00 0.83 0.65

April 1.02 0.18 149.12 -0.03 0.82 12.03 0.14 0.00 ** 6.71 2.14 0.06 0.12 5.88 -0.01 0.60 2.54

May 1.69 0.22 407.45 0.35 0.07 47.86 0.01 0.86 11.88 0.10 0.27 16.27 0.10 0.13 12.21

June 3.28 0.21 632.23 0.22 0.37 62.73 0.00 0.94 6.33 0.02 0.72 12.47 -0.01 0.93 13.33

July 0.11 0.94 503.00 -0.17 0.33 34.25 -0.03 0.25 3.01 -0.06 0.10 5.78 -0.01 0.81 7.01

August -1.25 0.17 290.25 -0.17 0.01 * 12.62 1.38 -0.01 0.02 * 1.05 1.41 -0.03 0.07 2.24 -0.02 0.18 3.24

September -0.49 0.46 202.59 -0.07 0.24 10.80 -0.01 0.25 1.12 -0.04 0.06 1.87 -0.01 0.70 3.65

October 0.56 0.39 162.02 0.05 0.50 10.78 0.00 0.97 1.33 -0.01 0.67 2.19 0.01 0.69 3.54

November 0.93 0.20 148.59 0.05 0.23 9.42 0.00 0.56 1.52 0.02 0.54 3.10 0.00 0.85 2.12

December 0.51 0.08 101.59 0.02 0.49 5.26 0.01 0.37 1.06 0.00 0.81 2.17 0.00 0.35 1.06


for each station

0.56 235.38 0.00 0.02 18.22 0.12 0.01 3.12 0.30 0.01 4.82 0.00 0.00 4.21 0.00



08K - Upper Fraser

08KE016 08KE024 08KG001 08KH001


Median Annual Flow (m3/s)

1.79 Median Annual Flow (m3/s) 1.15 Median Annual Flow (m3/s) 19.64 Median Annual Flow (m3/s) 86.40

Month Theil-Sen

Slope


Average Median

Monthly Flow



Theil-Sen Slope


Average Median

Monthly Flow


Median Monthly

Flow*

Theil-Sen Slope


Average Median

Monthly Flow



Theil-Sen Slope





January 0.01 0.28 1.17 0.00 0.15 0.48 0.10 0.02 * 12.58 0.80 0.20 0.29 45.62

February 0.00 0.79 1.39 0.00 0.38 0.48 0.10 0.02 * 12.52 0.80 0.09 0.46 40.79

March 0.00 0.57 2.81 0.00 0.58 0.63 0.14 0.05 * 17.66 0.81 -0.03 0.83 37.77

April 0.22 0.01 ** 13.08 1.72 0.01 0.45 2.15 1.08 0.01 * 62.26 1.73 0.22 0.55 59.94

May 0.21 0.15 18.75 0.07 0.09 8.84 1.68 0.05 * 109.32 1.54 0.25 0.68 191.85

June -0.01 0.85 6.52 -0.02 0.73 7.66 0.58 0.07 65.79 1.70 0.17 355.85

July -0.01 0.65 4.30 -0.02 0.21 2.69 0.29 0.33 45.32 -0.20 0.80 299.71

August 0.00 0.70 1.53 -0.01 0.07 1.12 0.15 0.20 21.67 -0.85 0.09 173.41

September 0.00 0.65 1.65 0.00 0.56 1.35 0.12 0.17 18.10 -0.81 0.05 114.52

October 0.01 0.68 1.93 0.01 0.31 1.63 0.19 0.05 * 19.35 0.96 0.05 0.91 87.96

November 0.01 0.33 1.79 0.01 0.03 * 1.39 1.08 0.15 0.01 ** 18.65 0.78 0.25 0.48 83.09

December 0.01 0.12 1.33 0.01 0.05 0.71 0.15 0.01 ** 13.93 1.04 0.28 0.24 60.45

Average for all


0.04 4.69 0.14 0.01 2.43 0.09 0.39 34.76 0.70 0.10 129.25 0.00

Average percentage change in median monthly flow for all months, weighted

by median annual flow 0.02




TABLE. RESULTS OF RECENT-TERM TREND ANALYSES FOR MEDIAN MONTHLY FLOW IN THE THOMPSON SUB-WATERSHED.

08L - Thompson

08LA001 08LB020 08LB024 08LB038 08LB047



121.97 Median Annual Flow

(m3/s) 5.60



(m3/s) 4.55


84.48

Month Theil-Sen

Slope



Flow


Flow*

Theil-Sen

Slope



Flow


Flow*

Theil-Sen

Slope



Flow


Flow*

Theil-Sen

Slope


Average Median

Monthly Flow


Flow*

Theil-Sen

Slope



Flow


Flow*

January 0.13 0.57 50.40 0.02 0.54 3.62 0.00 0.71 0.15 0.01 0.19 1.91 0.39 0.01 ** 30.66 1.28

February -0.08 0.73 47.13 0.02 0.38 3.74 0.00 0.44 0.15 0.01 0.51 1.67 0.43 0.00 ** 30.51 1.41

March -0.11 0.78 49.07 -0.02 0.58 4.66 0.00 0.89 0.18 0.00 0.60 2.14 0.34 0.16 35.93

April 0.12 0.96 109.43 -0.04 0.76 14.93 0.00 0.73 1.32 -0.05 0.51 6.47 0.00 0.99 85.56

May 2.17 0.45 453.59 0.25 0.42 45.48 0.04 0.23 3.44 0.35 0.04 * 27.59 1.27 2.51 0.16 279.38

June -0.18 0.91 705.87 0.03 0.96 49.30 0.02 0.24 1.38 -0.02 0.95 36.64 0.56 0.63 429.98

July -1.44 0.43 472.53 -0.03 0.76 17.36 0.00 0.75 0.61 -0.08 0.65 20.65 0.82 0.58 329.78

August -1.83 0.13 242.47 -0.02 0.58 5.60 0.00 0.41 0.28 -0.12 0.03 * 7.22 1.68 -0.16 0.82 203.00

September 0.61 0.27 153.71 -0.01 0.77 4.10 0.00 0.19 0.20 0.03 0.45 5.15 0.66 0.19 114.40

October 1.53 0.09 123.35 0.01 0.94 4.74 0.00 0.20 0.18 0.08 0.07 5.45 1.12 0.03 * 83.76 1.33

November 1.10 0.11 106.54 0.03 0.49 5.81 0.00 0.30 0.20 0.04 0.21 4.26 0.74 0.04 * 59.90 1.23

December 0.32 0.26 66.05 0.01 0.55 4.26 0.00 0.46 0.16 0.02 0.16 2.61 0.43 0.03 * 35.80 1.20

Average for all


0.19 215.01 0.00 0.02 13.63 0.00 0.00 0.69 0.00 0.02 10.15 0.25 0.65 143.22 0.54

08L - Thompson

08LB064 08LB069 08LB076





Monthly Flow










Monthly Flow*

January 0.41 0.21 92.69 0.01 0.50 2.50 0.00 0.69 0.71

February 0.44 0.22 90.32 0.01 0.36 2.49 0.00 0.76 0.71

March 0.07 0.85 103.60 0.01 0.64 3.11 -0.01 0.49 0.83

April -0.50 0.80 246.30 -0.02 0.71 9.78 -0.05 0.10 2.73

May 7.00 0.12 912.51 0.33 0.19 36.54 0.11 0.10 11.62

June -0.21 0.93 1274.56 -0.07 0.84 40.76 0.01 0.89 13.76

July -1.29 0.59 856.34 -0.11 0.39 13.91 -0.03 0.53 4.98

August -3.50 0.06 466.31 -0.04 0.10 4.24 -0.01 0.25 1.55

September 0.27 0.78 290.40 -0.01 0.72 3.28 0.00 0.93 1.29

October 1.63 0.31 228.02 0.01 0.83 4.08 0.01 0.65 1.56

November 1.82 0.14 195.98 0.04 0.26 4.69 0.01 0.30 1.56

December 0.91 0.07 119.18 0.02 0.28 3.20 0.00 0.59 0.90


for each station

0.59 406.35 0.00 0.01 10.72 0.00 0.00 3.52 0.00



08L - Thompson

08LB078 08LC002 08LC003 08LC018 08LC039




(m3/s) 51.97



(m3/s) 22.93


1.31

Month Theil-Sen

Slope



Flow


Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Flow*

Theil-Sen

Slope



Flow


Flow*

January 0.00 0.94 0.96 0.06 0.79 36.90 0.00 0.97 23.20 -0.03 0.80 18.87 0.00 0.83 0.89

February 0.00 0.91 0.99 0.14 0.40 39.83 0.04 0.81 25.73 0.05 0.76 21.21 0.00 0.90 0.96

March 0.00 0.45 1.18 0.08 0.73 48.54 -0.06 0.63 27.00 -0.05 0.71 21.59 -0.01 0.56 1.68

April 0.03 0.38 3.99 -0.30 0.48 85.49 -0.23 0.59 46.24 -0.25 0.36 34.00 -0.05 0.35 4.40

May 0.03 0.76 12.86 -0.38 0.87 179.33 1.00 0.18 111.04 0.77 0.16 75.61 0.11 0.10 11.50

June 0.06 0.50 7.03 1.48 0.35 278.61 0.01 1.00 153.58 0.00 1.00 116.63 0.15 0.21 10.23

July 0.02 0.54 3.02 0.23 0.86 151.37 -0.28 0.66 80.24 -0.26 0.65 63.99 -0.02 0.37 2.50

August -0.01 0.44 1.31 -0.35 0.26 57.20 -0.33 0.06 31.59 -0.23 0.02 * 24.06 0.98 -0.01 0.27 0.90

September 0.01 0.71 0.76 -0.13 0.62 41.69 -0.18 0.22 26.40 -0.19 0.02 * 21.32 0.90 0.00 0.70 1.12

October 0.00 0.75 0.92 0.12 0.70 42.65 0.03 0.81 26.02 0.03 0.68 20.14 -0.01 0.46 1.23

November 0.01 0.81 1.25 0.23 0.54 49.77 0.18 0.27 27.94 0.15 0.34 21.30 0.00 0.75 1.28

December 0.00 0.54 1.00 0.24 0.28 41.60 0.13 0.29 24.05 0.08 0.34 18.92 0.00 0.64 1.00

Average for all


0.01 2.94 0.00 0.12 87.75 0.00 0.03 50.25 0.00 0.01 38.14 0.16 0.51 3.14 0.00

08L - Thompson

08LC040 08LC042 08LD001 08LE020 08LE021




(m3/s) 1.07



(m3/s) 1.13


2.14

Month Theil-Sen

Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

Theil-Sen

Slope


Average Median

Monthly Flow


Median Monthly

Flow*

Theil-Sen

Slope



Flow


Median Monthly

Flow*

January 0.00 0.93 0.10 0.00 0.43 0.72 0.10 0.22 23.16 -0.01 0.14 0.93 0.00 0.64 1.72

February 0.00 0.81 0.12 0.00 0.51 0.76 0.06 0.32 19.55 -0.01 0.06 1.00 0.00 0.71 2.07

March 0.00 0.84 0.26 -0.01 0.40 1.24 0.02 0.71 18.89 0.00 0.96 1.44 0.01 0.76 3.09

April 0.00 0.74 1.24 -0.05 0.09 3.20 -0.01 1.00 34.62 0.04 0.49 4.44 -0.01 0.91 6.73

May 0.02 0.13 1.81 0.10 0.26 9.87 0.40 0.78 111.82 0.18 0.06 11.25 0.27 0.10 18.01

June 0.00 0.56 0.93 0.14 0.26 9.20 1.06 0.12 202.91 0.05 0.44 7.17 0.15 0.24 10.80

July 0.00 0.43 0.35 -0.02 0.24 2.01 0.08 0.95 158.39 -0.01 0.53 2.16 0.00 1.00 3.45

August 0.00 0.13 0.15 0.00 0.45 0.75 -0.64 0.03 * 91.91 0.69 -0.01 0.01 * 0.84 1.61 -0.01 0.53 1.36

September 0.00 0.60 0.10 0.00 0.96 0.95 -0.44 0.05 60.48 -0.01 0.10 0.81 -0.01 0.31 1.39

October 0.00 0.59 0.11 0.00 0.64 1.07 0.00 0.98 45.62 -0.01 0.04 * 1.06 1.03 -0.01 0.20 1.75

November 0.00 0.82 0.13 -0.01 0.49 1.07 0.14 0.68 42.07 -0.01 0.17 1.25 -0.01 0.47 2.13

December 0.00 0.96 0.12 0.00 0.22 0.83 0.08 0.60 31.96 -0.01 0.29 1.00 -0.01 0.32 1.81


for each station

0.00 0.45 0.00 0.01 2.64 0.00 0.07 70.11 0.06 0.02 2.78 0.22 0.03 4.53 0.00



08L - Thompson

08LE024 08LE027 08LE031 08LE077 08LE108


Median Annual Flow (m3/s) 20.03 Median Annual Flow (m3/s) 18.51 Median Annual Flow (m3/s) 188.24 Median Annual Flow (m3/s) 0.07 Median Annual Flow (m3/s) 0.04

Month Theil-Sen

Slope Mann-Kendall

p-value


Flow


Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

January 0.04 0.33 8.52 0.03 0.03 * 6.68 0.41 0.40 0.69 125.75 0.00 0.54 0.04 0.00 0.06 0.02

February 0.00 0.98 9.10 0.01 0.01 * 7.40 0.17 0.25 0.64 113.39 0.00 0.62 0.05 0.00 0.27 0.03

March 0.07 0.65 15.33 0.08 0.08 13.29 0.01 0.99 115.31 0.00 0.49 0.09 0.00 0.09 0.05

April -0.10 0.68 36.31 0.06 0.06 33.26 0.70 0.57 183.73 -0.01 0.09 0.42 -0.01 0.08 0.28

May 0.43 0.24 85.84 0.54 0.54 80.04 0.00 0.99 471.59 0.01 0.07 1.68 0.01 0.30 0.41

June -0.02 0.99 110.48 0.21 0.21 111.27 3.50 0.27 872.53 0.02 0.06 1.13 0.00 0.45 0.15

July -0.16 0.77 59.89 0.05 0.05 64.41 0.74 0.94 683.03 0.00 0.66 0.22 0.00 0.91 0.08

August -0.28 0.01 * 25.26 1.10 -0.27 -0.27 *** 25.19 1.06 -2.03 0.25 347.56 0.00 0.77 0.05 0.00 0.57 0.04

September -0.04 0.53 18.38 -0.02 -0.02 *** 17.64 0.10 -1.57 0.09 208.49 0.00 0.94 0.04 0.00 0.33 0.03

October 0.05 0.76 18.79 0.09 0.09 17.44 -0.59 0.42 165.39 0.00 0.76 0.06 0.00 0.24 0.03

November 0.14 0.29 19.47 0.15 0.15 16.16 -0.03 0.96 179.01 0.00 0.78 0.07 0.00 0.48 0.03

December 0.03 0.64 11.07 0.04 0.04 * 8.91 0.47 0.32 0.79 155.06 0.00 0.83 0.05 0.00 0.15 0.02

Average for all


0.01 34.87 0.09 0.08 33.48 0.18 0.14 301.74 0.00 0.00 0.33 0.00 0.00 0.10 0.00

08L - Thompson

08LF002 08LF007 08LF027 08LF051



Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median

Monthly Flow



Theil-Sen Slope





Theil-Sen Slope





Theil-Sen Slope





January 0.00 0.99 2.02 0.00 0.68 0.22 0.00 0.34 0.50 0.42 0.61 244.69

February 0.00 0.83 2.24 0.00 0.69 0.22 0.00 0.75 0.54 0.06 0.95 235.03

March -0.02 0.33 3.04 0.00 0.27 0.32 0.00 0.93 0.70 -0.77 0.56 240.16

April 0.02 0.81 6.46 0.00 0.99 1.48 0.00 0.75 2.19 -1.15 0.80 423.70

May 0.38 0.03 * 15.27 2.47 0.12 0.05 7.19 0.24 0.01 * 7.79 3.11 -1.72 0.82 1406.25

June 0.33 0.08 15.08 0.08 0.10 4.99 0.13 0.02 * 4.55 2.79 1.67 0.82 2236.09

July 0.05 0.50 8.11 0.00 0.71 1.12 0.02 0.26 2.09 0.82 0.91 1670.19

August 0.04 0.40 3.64 0.00 0.69 0.36 0.00 0.96 0.99 -4.98 0.09 888.94

September 0.06 0.03 * 2.98 1.92 0.00 0.46 0.34 0.00 0.96 0.85 -0.45 0.78 537.61

October 0.05 0.02 * 2.64 1.92 0.00 0.30 0.39 0.01 0.11 0.68 2.10 0.38 415.25

November 0.03 0.15 2.39 0.00 0.82 0.35 0.01 0.13 0.64 1.55 0.59 395.91

December 0.02 0.14 2.11 0.00 0.48 0.26 0.01 0.12 0.59 0.44 0.80 306.63

Average for all


0.08 5.50 0.53 0.02 1.44 0.00 0.03 1.84 0.49 -0.17 750.04 0.00



08L - Thompson

08LG006 08LG008 08LG010 08LG041



Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median

Monthly Flow



Theil-Sen Slope





Theil-Sen Slope





Theil-Sen Slope





January 0.04 0.37 7.84 -0.03 0.50 2.77 0.04 0.37 2.38 0.00 0.78 0.15

February -0.01 0.95 9.31 -0.03 0.28 3.35 0.06 0.23 3.65 0.00 0.75 0.15

March -0.04 0.73 13.52 -0.07 0.34 5.52 0.08 0.38 5.32 0.01 0.04 * 0.22 2.28

April -0.19 0.49 28.47 -0.22 0.10 13.64 -0.05 0.73 10.76 0.01 0.04 * 0.54 2.63

May 1.90 0.00 ** 78.64 2.41 0.68 0.02 * 32.60 2.07 0.29 0.24 22.82 0.10 0.00 ** 2.59 3.95

June 0.34 0.54 68.71 0.26 0.20 25.78 -0.20 0.41 18.39 0.03 0.17 2.14

July 0.11 0.54 21.98 0.04 0.61 7.54 -0.05 0.67 5.11 0.00 0.81 1.07

August 0.01 0.84 7.84 -0.01 0.66 1.77 -0.01 0.53 1.04 0.00 0.89 0.71

September -0.01 0.71 5.28 0.00 0.74 1.14 -0.01 0.49 0.74 0.00 0.32 0.41

October -0.01 0.87 7.03 -0.01 0.80 2.13 0.01 0.63 1.92 0.00 0.55 0.24

November 0.11 0.24 12.12 0.02 0.68 4.77 0.09 0.14 4.11 0.00 0.92 0.18

December 0.06 0.41 8.38 0.01 0.65 3.28 0.05 0.11 2.42 0.00 0.86 0.15

Average for all


0.19 22.43 0.20 0.05 8.69 0.17 0.03 6.56 0.00 0.01 0.71 0.74



08L - Thompson

08LG048 08LG049 08LG056 08LG065 08LG067




(m3/s) 1.29 Median Annual Flow (m3/s) 0.06



(m3/s) 0.32

Month Theil-Sen

Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Flow*

Theil-Sen Slope



Flow



Theil-Sen Slope



Flow



Theil-Sen Slope



Flow


Flow*

January 0.01 0.52 1.86 0.00 0.63 0.86 0.00 0.04 * 0.03 1.81 0.00 0.65 1.50 0.00 0.32 0.21

February 0.01 0.39 2.50 0.00 0.77 1.00 0.00 0.06 0.03 0.00 0.73 1.74 0.00 0.69 0.24

March 0.00 0.91 3.28 0.00 0.49 1.38 0.00 0.00 ** 0.04 2.90 0.00 0.82 2.41 0.01 0.07 0.31

April -0.09 0.23 7.92 0.04 0.48 3.90 0.00 0.04 * 0.15 1.40 0.03 0.32 3.76 0.02 0.01 * 0.65 3.11

May 0.15 0.34 20.15 0.39 0.01 ** 18.33 2.13 0.03 0.00 *** 0.59 4.65 0.28 0.13 14.51 0.14 0.00 *** 2.97 4.76

June -0.05 0.84 18.24 0.14 0.28 13.34 0.01 0.02 * 0.41 3.18 0.05 0.81 15.55 0.06 0.09 2.21

July -0.03 0.47 5.58 -0.03 0.48 4.28 0.00 0.02 * 0.14 2.35 -0.04 0.28 6.24 0.03 0.02 * 0.98 2.64

August -0.01 0.28 1.21 -0.01 0.56 1.49 0.00 0.04 * 0.06 1.95 0.01 0.60 3.90 0.01 0.01 * 0.51 2.84

September 0.00 0.86 0.86 0.00 0.89 0.77 0.00 0.00 ** 0.05 2.72 0.00 0.75 2.23 0.01 0.20 0.35

October 0.02 0.53 1.86 0.00 0.79 0.62 0.00 0.00 ** 0.05 2.88 0.01 0.54 1.86 0.00 0.19 0.28

November 0.06 0.11 4.07 0.01 0.66 0.86 0.00 0.00 *** 0.04 4.27 0.01 0.19 1.83 0.01 0.01 ** 0.25 2.70

December 0.02 0.45 2.23 0.00 1.00 0.90 0.00 0.00 *** 0.03 4.48 0.00 0.54 1.55 0.00 0.25 0.21

Average for all


0.01 5.81 0.00 0.04 3.98 0.18 0.00 0.14 2.72 0.03 4.76 0.00 0.02 0.76 1.34

Average percentage change in median monthly flow for all months, weighted

by median annual flow 0.05




TABLE. RESULTS OF RECENT-TERM TREND ANALYSES FOR MEDIAN MONTHLY FLOW IN THE LOWER FRASER SUB-WATERSHED.

08M - Lower Fraser

08MA001 08MA002 08MA003 08MB005



Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median

Monthly Flow

Average Percentage


Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

January -0.25 0.45 21.77 0.07 0.52 13.77 0.05 0.43 6.28 -0.38 0.10 28.07

February -0.19 0.45 19.03 0.07 0.69 11.16 0.03 0.67 5.32 -0.43 0.06 26.65

March -0.05 0.82 16.41 0.05 0.78 9.25 0.03 0.49 4.68 -0.28 0.24 26.62

April 0.08 0.54 19.77 0.04 0.96 9.21 0.01 0.85 6.16 0.38 0.48 42.42

May 0.68 0.24 56.34 0.56 0.20 22.25 0.67 0.07 28.65 2.58 0.09 91.68

June 1.00 0.61 191.75 0.27 0.65 81.89 -0.23 0.69 90.64 1.03 0.61 224.32

July -1.40 0.27 251.77 -1.11 0.12 122.70 -0.75 0.06 113.03 -2.25 0.13 269.23

August -0.50 0.69 209.09 -0.60 0.21 108.51 -0.13 0.89 92.40 -0.60 0.63 217.36

September -0.17 0.73 120.73 -0.41 0.24 66.01 -0.28 0.32 45.58 -0.05 0.95 130.84

October 0.06 1.00 68.13 -0.09 0.80 40.50 0.10 0.63 20.96 0.00 1.00 79.25

November 0.25 0.54 45.88 0.05 0.82 28.11 0.09 0.37 12.42 0.20 0.74 54.10

December 0.10 0.71 28.54 0.13 0.50 18.80 0.11 0.06 7.88 -0.06 0.84 33.45

Average for all


-0.03 87.43 0.00 -0.08 44.35 0.00 -0.03 36.17 0.00 0.01 102.00 0.00

08M - Lower Fraser

08MF005 08MF040 08MF062 08MF065 08MF068


Median Annual Flow (m3/s) 1,932.86


1,267.15 Median Annual Flow

(m3/s) 1.85 Median Annual Flow (m3/s) 20.84

Median Annual Flow (m3/s) 20.70

Month Theil-Sen

Slope Mann-Kendall

p-value


Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Monthly Flow*

Theil-Sen Slope



Flow


Monthly Flow*

Theil-Sen Slope



Flow

Average Percentage


Theil-Sen Slope



Flow


Flow*

January 6.33 0.43 969.24 2.69 0.60 623.20 0.00 0.93 1.72 -0.14 0.67 12.28 -0.28 0.45 21.51

February 10.70 0.22 947.17 0.71 0.87 629.10 0.01 0.65 1.57 -0.12 0.46 10.64 0.37 0.44 18.26

March 19.35 0.05 * 1021.38 1.89 1.88 0.75 671.00 0.04 0.22 1.89 0.03 0.80 13.31 0.38 0.40 21.87

April 40.54 0.25 2088.10 8.93 0.63 1404.33 0.05 0.61 3.65 -0.15 0.58 22.44 0.18 0.58 33.15

May 55.50 0.28 4959.52 64.04 0.10 3112.50 0.07 0.72 9.71 1.32 0.11 64.68 0.06 0.90 63.77

June -25.00 0.74 6940.00 38.57 0.50 4075.25 -0.18 0.53 8.98 -0.51 0.54 93.17 -0.29 0.79 59.61

July -80.45 0.17 5474.76 -32.50 0.56 3313.50 -0.02 0.63 3.40 -1.47 0.35 70.34 -0.40 0.57 27.68

August -40.63 0.15 3151.90 -21.15 0.28 2095.00 -0.01 0.32 1.05 -0.31 0.55 31.71 -0.04 0.61 8.49

September -11.25 0.65 2131.43 -17.42 0.18 1425.00 -0.01 0.24 0.77 -0.01 0.94 18.84 0.00 1.00 7.63

October -0.50 1.00 1878.57 -16.63 0.23 1251.60 -0.02 0.46 1.51 0.12 0.65 19.28 -0.07 0.76 15.37

November 7.86 0.57 1775.95 -15.04 0.23 1087.53 0.01 0.69 2.66 0.15 0.75 21.50 0.15 0.83 27.70

December 14.11 0.18 1113.71 -0.92 0.92 717.40 0.02 0.18 1.84 0.14 0.70 13.72 0.15 0.59 18.01

Average for all


-0.29 2704.31 0.16 1.10 1700.45 0.00 0.00 3.23 0.00 -0.08 32.66 0.00 0.02 26.92 0.00



08M - Lower Fraser

08MG001 08MG013 08MH001 08MH002



Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median

Monthly Flow

Average Percentage


Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

January -0.52 0.34 36.90 -3.50 0.14 274.73 -0.50 0.43 56.43 0.14 0.15 8.62

February 0.01 0.96 25.10 -3.20 0.35 225.48 0.60 0.57 46.28 0.16 0.00 ** 5.25 2.98

March 0.84 0.09 34.28 2.03 0.47 228.70 1.52 0.03 * 48.68 3.11 0.28 0.00 *** 7.12 3.96

April 0.68 0.15 39.54 -3.36 0.38 274.80 0.40 0.41 56.72 0.23 0.01 ** 6.68 3.48

May -0.08 0.96 50.01 -2.00 0.72 481.95 1.64 0.16 108.33 0.18 0.04 * 6.45 2.71

June -0.82 0.40 40.18 -6.46 0.38 874.10 -0.76 0.74 130.18 0.02 0.71 4.26

July -0.39 0.20 20.49 -4.40 0.50 872.55 -1.05 0.33 87.92 0.00 0.96 2.69

August -0.20 0.22 9.02 -2.50 0.44 556.05 -0.24 0.74 37.53 0.08 0.02 * 2.55 3.19

September -0.26 0.28 9.91 -0.52 0.82 355.95 -0.07 0.86 27.33 0.08 0.01 ** 2.41 3.11

October -0.38 0.54 25.88 2.50 0.54 308.25 0.23 0.83 41.08 0.28 0.02 * 7.50 3.75

November 1.00 0.31 48.30 4.47 0.38 399.68 0.99 0.28 68.16 0.37 0.00 ** 12.25 3.04

December -0.08 0.83 29.45 -0.76 0.75 305.30 0.52 0.38 53.47 0.27 0.02 * 10.65 2.50

Average for all


-0.02 30.76 0.00 -1.47 429.79 0.00 0.27 63.51 0.26 0.17 6.37 2.39

08M - Lower Fraser

08MH005 08MH006 08MH016 08MH029 08MH056




(m3/s) 1.43



(m3/s) 3.17

Median Annual Flow (m3/s) 7.86

Month Theil-Sen

Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope



Flow


Monthly Flow*

Theil-Sen Slope



Flow



Theil-Sen Slope



Flow



Theil-Sen Slope



Flow


Flow*

January -0.06 0.12 5.14 -0.02 0.60 2.82 -0.34 0.06 13.84 -0.07 0.21 6.56 -0.03 0.71 7.67

February 0.01 0.93 4.32 -0.01 0.94 1.85 0.06 0.82 11.59 -0.03 0.50 4.84 0.04 0.87 5.47

March 0.05 0.12 5.99 0.04 0.21 2.44 0.33 0.14 12.06 0.08 0.13 5.02 0.19 0.08 6.19

April 0.03 0.29 4.04 0.03 0.19 2.19 -0.01 0.78 14.83 0.03 0.61 4.11 0.02 0.78 8.37

May 0.04 0.03 * 3.84 0.96 -0.03 0.49 1.90 0.61 0.08 28.83 0.01 0.87 2.94 0.33 0.05 18.05

June 0.05 0.05 * 3.44 1.33 -0.03 0.15 1.37 -0.16 0.87 40.57 0.01 0.92 2.05 -0.19 0.45 20.40

July 0.00 0.94 3.10 -0.01 0.40 0.60 -0.26 0.50 30.29 -0.01 0.43 1.22 -0.12 0.46 13.45

August 0.02 0.19 3.05 0.00 0.11 0.27 -0.15 0.38 14.10 -0.03 0.07 0.90 -0.06 0.34 5.81

September 0.02 0.17 3.11 0.00 0.96 0.44 -0.07 0.57 8.84 -0.01 0.28 0.91 -0.03 0.61 3.92

October 0.00 1.00 3.49 -0.04 0.32 1.63 0.11 0.61 11.11 0.03 0.34 1.48 -0.02 0.71 6.62

November 0.06 0.24 4.82 0.07 0.29 3.35 0.29 0.46 19.52 0.01 0.93 4.36 0.17 0.40 11.38

December -0.02 0.90 5.20 -0.01 0.73 2.33 0.03 0.93 13.93 -0.09 0.34 5.56 -0.02 1.00 6.84

Average for all


0.02 4.13 0.19 0.00 1.77 0.00 0.04 18.29 0.00 -0.01 3.33 0.00 0.02 9.52 0.00



08M - Lower Fraser

08MH076 08MH090 08MH098 08MH103 08MH141




(m3/s) 0.79



(m3/s) 27.67 Median Annual Flow (m3/s)

4.08

Month Theil-Sen

Slope



Flow


Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Flow*

Theil-Sen Slope



Flow


Median Monthly

Flow*

January -0.04 0.51 3.18 -0.02 0.37 2.17 -0.01 0.26 0.56 -0.47 0.15 27.14 0.00 1.00 3.74

February 0.00 0.93 2.17 0.02 0.28 1.50 0.00 0.63 0.37 0.16 0.69 22.04 0.00 0.81 2.72

March 0.06 0.24 2.76 0.04 0.05 1.67 0.01 0.24 0.43 0.56 0.10 22.89 0.07 0.19 4.03

April 0.02 0.61 2.12 0.02 0.43 1.11 0.00 0.72 0.26 0.11 0.74 28.78 0.02 0.92 5.74

May -0.01 0.69 1.45 0.00 0.89 0.67 0.00 0.92 0.12 0.91 0.19 57.52 0.04 0.75 8.80

June -0.01 0.31 0.93 -0.01 0.21 0.41 0.00 0.87 0.07 -0.37 0.71 71.59 -0.09 0.40 9.07

July -0.01 0.34 0.33 0.00 0.34 0.26 0.00 0.93 0.03 -0.40 0.55 50.18 -0.05 0.38 5.36

August 0.00 0.78 0.16 0.00 0.53 0.21 0.00 0.20 0.02 -0.15 0.67 21.67 -0.03 0.33 2.03

September 0.00 0.78 0.32 0.00 0.24 0.26 0.00 0.12 0.05 -0.05 0.89 14.51 0.02 0.49 1.69

October -0.03 0.37 1.32 0.00 1.00 0.62 0.00 0.53 0.15 0.11 0.76 21.03 -0.07 0.56 4.48

November 0.03 0.41 3.43 0.00 0.93 1.77 0.01 0.38 0.56 0.28 0.57 35.63 0.09 0.32 5.87

December -0.04 0.19 2.73 -0.03 0.30 1.94 0.00 0.92 0.55 0.08 0.87 25.41 0.01 0.94 2.88

Average for all


0.00 1.74 0.00 0.00 1.05 0.00 0.00 0.27 0.00 0.06 33.20 0.00 0.00 4.70 0.00

08M - Lower Fraser

08MH147 08MH153 08MH155 08MH156



Month Theil-Sen

Slope Mann-Kendall

p-value

Average Median

Monthly Flow

Average Percentage


Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

Theil-Sen Slope


Average Median

Monthly Flow


Monthly Flow*

January -0.09 0.76 12.80 -0.01 0.38 1.45 -0.06 0.09 2.72 - - - - -

February -0.08 0.41 10.00 0.01 0.48 1.02 0.01 0.25 1.78 - - - - -

March 0.45 0.07 14.92 0.03 0.04 * 1.11 2.43 0.07 0.01 ** 2.09 3.41 - - - - -

April -0.26 0.49 22.87 0.02 0.08 0.84 0.01 0.57 1.27 -0.01 0.21 0.36

May 0.39 0.53 49.52 0.00 0.81 0.53 0.00 0.78 0.69 -0.01 0.00 *** 0.24 5.47

June -0.72 0.24 64.39 0.00 1.00 0.34 0.00 0.89 0.43 -0.01 0.00 *** 0.21 4.77

July -0.74 0.21 53.94 0.00 0.27 0.17 0.00 0.21 0.27 -0.01 0.00 *** 0.15 5.88

August -0.17 0.58 30.22 0.00 0.21 0.10 0.00 0.84 0.24 -0.01 0.00 ** 0.13 5.24

September 0.01 1.00 19.91 0.00 0.53 0.14 0.00 0.40 0.30 -0.01 0.00 ** 0.15 5.03

October 0.11 0.80 24.25 0.00 0.75 0.34 -0.01 0.52 0.84 -0.01 0.01 * 0.21 4.31

November 0.43 0.53 23.43 0.03 0.06 1.14 0.02 0.55 2.64 -0.01 0.09 0.23

December -0.07 0.74 10.34 0.00 0.94 1.29 -0.02 0.46 2.66 - - - - -


for each station

-0.06 28.05 0.00 0.01 0.71 0.20 0.00 1.33 0.28 -0.01 0.21 3.84

Average percentage change in median monthly flow for all months, weighted by median annual flow 0.07




TRENDS IN ANNUAL FLOW FOR THE FRASER LOWER MAINLANDWATERSHED

TABLE. RESULTS OF LINEAR REGRESSION ANALYSES FOR LONG-TERM TRENDS IN MEDIAN ANNUAL FLOW IN THE FRASER SIVER WATERSHED, BY SUB-WATERSHED.

Sub-Basin Station Start Year

Intercept Intercept Standard

Error

Intercept T-Test

Statistic

Intercept T-Test

p-value Slope

Slope Standard

Error

Slope T-Test

Statistic

Slope T-Test p-value

Adjusted R-

Squared

F-Test Static

F-Test p-value

08J - Nechako

08JB002 1929 88.87 45.45 1.96 0.05 -0.04 0.02 -1.69 0.09 0.02 2.87 0.09

08JC001 1915 3953.19 619.86 6.38 0.00 -1.94 0.31 -6.17 0.00 *** 0.27 38.05 0.00 ***

08JE001 1929 133.74 245.21 0.55 0.59 -0.02 0.12 -0.17 0.86 -0.01 0.03 0.86

08K - Upper Fraser

08KA001 1915 206.04 25.27 8.15 0.00 -0.10 0.01 -7.90 0.00 *** 0.38 62.34 0.00 ***

08KH001 1924 239.81 183.48 1.31 0.19 -0.08 0.09 -0.82 0.42 0.00 0.67 0.42

08KH006 1939 665.19 416.52 1.60 0.11 -0.25 0.21 -1.19 0.24 0.01 1.42 0.24

08L - Thompson

08LA001 1914 -41.73 206.75 -0.20 0.84 0.08 0.11 0.78 0.44 0.00 0.61 0.44

08LB020 1915 -11.63 12.81 -0.91 0.37 0.01 0.01 1.33 0.19 0.01 1.76 0.19

08LC002 1911 -39.19 73.82 -0.53 0.60 0.05 0.04 1.20 0.23 0.00 1.43 0.23

08LD001 1911 84.38 77.75 1.09 0.28 -0.02 0.04 -0.48 0.63 -0.01 0.23 0.63

08LE020 1911 19.90 3.11 6.41 0.00 -0.01 0.00 -5.95 0.00 *** 0.25 35.42 0.00 ***

08LF002 1911 8.41 6.70 1.25 0.21 0.00 0.00 -0.78 0.44 0.00 0.61 0.44

08LG006 1911 182.10 46.61 3.91 0.00 -0.09 0.02 -3.65 0.00 *** 0.11 13.34 0.00 ***

08M - Lower Fraser

08MA001 1927 1369.93 202.01 6.78 0.00 -0.66 0.10 -6.49 0.00 *** 0.31 42.06 0.00 ***

08MA002 1928 386.27 112.00 3.45 0.00 -0.18 0.06 -3.15 0.00 ** 0.09 9.94 0.00 **

08ME002 1914 194.32 40.42 4.81 0.00 -0.09 0.02 -4.61 0.00 *** 0.16 21.26 0.00 ***

08MF005 1912 -1975.43 2472.05 -0.80 0.43 1.96 1.26 1.55 0.12 0.01 2.42 0.12

08MG001 1911 30.97 38.79 0.80 0.43 0.00 0.02 -0.09 0.93 -0.01 0.01 0.93

08MH001 1911 -152.53 60.71 -2.51 0.01 0.10 0.03 3.34 0.00 ** 0.09 11.16 0.00 **

TABLE. RESULTS OF MANN-KENDALL NON-PARAMETRIC TREND ANALYSIS FOR LONG-TERM TRENDS IN MEDIAN ANNUAL FLOW IN THE FRASER LOWER MAINLANDWATERSHED, BY SUB-WATERSHED.

Sub-Basin Station Start Year Theil -Sen

Slope

Mann-Kendall Test

Statistic Mann-Kendall Test p-value

Median Annual Flow

(m3/s)

Average Percentage

Change in Median Annual Flow (%)

Weighted Averaged Between Stations

Median Average Percentage Change in Annual Flow for entire

basin

08J - Nechako

08JB002 1929 0.00 74 0.80 11.332 0.00

0.00

-0.02

08JC001 1915 0.03 67 0.85 114.223 0.00

08JE001 1929 -0.02 -63 0.82 92.243 0.00

08K - Upper Fraser

08KA001 1915 0.00 -269 0.42 6.433 0.00

0.00 08KH001 1924 -0.04 -161 0.60 89.798 0.00

08KH006 1939 -0.19 -193 0.41 168.515 0.00

08L - Thompson

08LA001 1914 0.00 -19 0.96 121.096 0.00

0.00

08LB020 1915 0.00 -74 0.83 5.487 0.00

08LC002 1911 0.00 -23 0.95 49.621 0.00

08LD001 1911 -0.02 -205 0.58 46.988 0.00

08LE020 1911 0.00 -656 0.08 1.341 0.00

08LF002 1911 0.00 -112 0.76 3.164 0.00

08LG006 1911 -0.01 -238 0.51 11.518 0.00

08M - Lower Fraser

08MA001 1927 -0.37 -1371 0.00 *** 59.948 -0.62

-0.52

08MA002 1928 -0.11 -718 0.01 * 33.227 -0.34

08ME002 1914 -0.01 -278 0.44 6.601 0.00

08MF005 1912 2.07 530 0.14 1867.419 0.00

08MG001 1911 0.00 185 0.62 27.169 0.00

08MH001 1911 0.01 109 0.77 51.426 0.00



FIGURE. TIME-SERIES OF LONG-TERM TRENDS IN MEDIAN ANNUAL FLOW FOR THE NECHAKO SUB-WATERSHED, BY STATION.



FIGURE. TIME-SERIES OF LONG-TERM TRENDS IN MEDIAN ANNUAL FLOW FOR THE UPPER FRASER, BY STATION.



FIGURE. TIME-SERIES OF LONG-TERM TRENDS IN MEDIAN ANNUAL FLOW FOR THE THOMPSON SUB-WATERSHED, BY STATION.







FIGURE. TIME-SERIES OF LONG-TERM TRENDS IN MEDIAN ANNUAL FLOW FOR THE LOWER FRASER SUB-WATERSHED, BY STATION.



HYDROLOGICAL ALTERATION IN THE FRASER LOWER MAINLAND WATERSHED

TABLE. NON-PARAMETRIC COMPARISON OF VARIANCE FOR HISTORICAL VS. RECENT MONTHLY FLOW IN THE NECHAKO SUB-WATERSHED.

Historical Recent Fligner-Killeen Mann-Whitney

Sub-watershed Station Month Number of

Years of Sampling

Median Monthly

Flow (m3/s)

Median Absolute Deviation

in Monthly Flow (m3/s)

Number of Years of

Sampling

Median Monthly

Flow (m3/s)



Test Statistic p-value Test Statistic p-value

Percentage Change in Monthly

Flow Between the Two

Time Periods

Average Percentage

Change Across

Months*

Median Annual

Flow (m3/s)

Weighted average

across sub-watershed

08J - Nechako

08JB002

January 33 7.59 3.45 35 6.11 1.88 130.99 0.00 *** 704395.5 0.00 *** 19.5

18.97 11.33

24.61

February 33 7.45 2.77 34 5.815 1.85 61.62 0.00 *** 599080 0.00 *** 21.9

March 34 7.31 2.18 34 5.51 1.98 8.73 0.00 ** 742803.5 0.00 *** 24.6

April 34 7.5 2.59 34 7.195 3.25 38.35 0.00 *** 530306.5 0.45

May 34 30.75 25.43 35 34 25.20 1.52 0.22 527172.5 0.01 ** 10.6

June 34 62 25.20 35 46.1 19.05 5.57 0.02 * 700197.5 0.00 *** 25.6

July 35 42.2 14.68 35 32.4 10.38 36.48 0.00 *** 765691.5 0.00 *** 23.2

August 35 24.5 8.01 35 19.1 5.19 53.86 0.00 *** 830905.5 0.00 *** 22.0

September 35 15.2 4.30 35 11.7 3.10 59.30 0.00 *** 795134.5 0.00 *** 23.0

October 34 10.6 2.74 35 8.27 2.08 60.72 0.00 *** 822353.5 0.00 *** 22.0

November 34 9.4 3.65 35 7.385 1.93 82.82 0.00 *** 687232 0.00 *** 21.4

December 34 7.93 3.48 35 6.85 2.16 94.24 0.00 *** 698058.5 0.00 *** 13.6

08JC001

January 27 71.25 26.02 36 44.5 7.41 482.89 0.00 *** 715734 0.00 *** 37.5

38.53 114.22

February 26 68 25.95 36 44.2 6.23 442.80 0.00 *** 591355 0.00 *** 35.0

March 26 70.8 27.28 36 45.85 8.52 394.02 0.00 *** 715375.5 0.00 *** 35.2

April 32 104 55.15 36 81.75 32.54 71.81 0.00 *** 575081.5 0.00 *** 21.4

May 33 232 160.12 36 152 59.30 236.13 0.00 *** 735782.5 0.00 *** 34.5

June 33 242.5 156.41 36 135 37.07 245.35 0.00 *** 739283 0.00 *** 44.3

July 34 242.5 186.07 36 208 121.57 168.00 0.00 *** 612868 0.01 * 14.2

August 35 225 127.50 36 210.5 94.15 46.86 0.00 *** 565382.5 0.05 * 6.4

September 35 176 114.16 36 59.7 13.64 888.05 0.00 *** 889495.5 0.00 *** 66.1

October 34 141 132.84 36 50.2 7.56 617.29 0.00 *** 842652 0.00 *** 64.4

November 33 125 109.49 36 49.8 9.86 596.78 0.00 *** 734042 0.00 *** 60.2

December 30 82.1 49.07 36 46.7 9.64 481.49 0.00 *** 719698.5 0.00 *** 43.1

08JE001

January 35 68 30.25 42 59 16.16 247.72 0.00 *** 788456.5 0.00 *** 13.2

8.06 92.24 February 39 54.9 18.98 42 50.6 11.93 126.91 0.00 *** 656410.5 0.00 *** 7.8

March 39 42.2 13.79 42 44.5 9.04 112.19 0.00 *** 710556.5 0.00 *** 5.5



April 41 44.2 16.90 42 52 15.42 3.57 0.06 575054 0.00 *** 17.6

May 41 108 51.45 42 139 61.23 24.28 0.00 *** 569978.5 0.00 *** 28.7

June 42 258 91.92 42 277 77.84 5.09 0.02 * 656542.5 0.00 *** 7.4

July 43 277.5 88.21 42 288 76.35 4.47 0.03 * 809539 0.03 * 3.8

August 43 200 54.86 42 203 57.82 0.02 0.90 854536 0.81

September 42 132 40.03 42 132 40.03 0.04 0.83 833449 0.03 * 0.0

October 43 93.4 27.58 42 94.8 28.47 10.01 0.00 ** 918555 0.00 *** 1.5

November 42 78.4 31.58 42 76.7 21.79 78.34 0.00 *** 812468.5 0.01 ** 2.2

December 39 74.8 36.92 42 68 19.79 196.06 0.00 *** 837673.5 0.00 *** 9.1



FIGURE. PERCENTAGE CHANGE IN MEDIAN MONTHLY FLOW FOR RECENTVS. HISTORICALPERIODS IN THE NECHAKO SUB-WATERSHED, BY STATION.

FIGURE. ANALYSIS OF VARIANCE IN MONTHLY FLOW FOR THE RECENT VS. HISTORIC PERIODS IN THE NECHAKO RIVER SUB -WATERSHED, BY STATION.



TABLE. NON-PARAMETRIC COMPARISON OF VARIANCE FOR HISTORIC VS RECENT MONTHLY FLOWS IN THE UPPER FRASER SUB-WATERSHED.

Historical Recent Fligner-Killeen Mann-Whitney


Years of Sampling

Median Monthly

Flow (m3/s)


in Monthly Flow

(m3/s)

Number of Years of

Sampling

Median Monthly

Flow (m3/s)


in Monthly Flow

(m3/s)




Time Periods

Average Percentage

Change Across

Months*

Median Annual

Flow (m3/s)

Weighted average


08K - Upper Fraser

08KA001

January 21 1.9 0.36 26 1.895 0.38 0.13 0.72 270546 0.30

7.31 6.43

8.61

February 21 1.5 0.31 26 1.61 0.28 1.45 0.23 186622 0.00 *** 7.3

March 22 1.47 0.33 26 1.58 0.34 0.01 0.92 245796.5 0.01 ** 7.5

April 24 2.26 0.92 26 2.51 1.41 109.06 0.00 *** 215040 0.00 *** 11.1

May 24 14.5 11.58 26 18.75 15.16 21.89 0.00 *** 247260.5 0.00 *** 29.3

June 25 41.85 20.53 26 40.05 13.86 78.54 0.00 *** 292857 0.56

July 26 40.3 12.31 26 37.25 11.05 8.59 0.00 ** 363655.5 0.00 *** 7.6

August 26 26.4 10.67 26 25 9.34 16.78 0.00 *** 360412.5 0.00 *** 5.3

September 26 13.15 6.50 26 12.8 5.35 22.31 0.00 *** 309347 0.56

October 27 7.14 3.11 26 6.83 2.99 1.06 0.30 363225 0.01 ** 4.3

November 27 3.94 1.51 26 3.68 1.26 11.23 0.00 *** 333924.5 0.01 ** 6.6

December 24 2.595 0.51 26 2.37 0.55 5.52 0.02 * 306007.5 0.00 *** 8.7

08KH001

January 39 46.2 14.83 48 43 12.31 15.29 0.00 *** 893124 0.14

8.23 89.80

February 41 33.85 12.90 48 36.8 9.93 24.37 0.00 *** 640411.5 0.00 *** 8.7

March 40 28.3 7.26 48 34 9.12 6.66 0.01 ** 650255 0.00 *** 20.1

April 43 43.3 22.68 48 54.6 29.65 49.02 0.00 *** 691061.5 0.00 *** 26.1

May 45 153 84.51 48 187.5 85.25 0.09 0.76 822141.5 0.00 *** 22.5

June 45 328 90.44 48 337 78.58 1.36 0.24 840038.5 0.00 *** 2.7

July 44 276 77.10 48 292 91.92 13.18 0.00 *** 908682 0.00 *** 5.8

August 45 174 56.34 48 172 54.86 0.19 0.66 1026535.5 0.97

September 45 113 34.84 48 110 35.58 0.96 0.33 1043953 0.00 *** 2.7

October 44 91.2 27.87 48 87.5 25.95 36.28 0.00 *** 1117431.5 0.00 *** 4.1

November 44 78.7 31.88 48 76.25 26.09 38.89 0.00 *** 978892 0.17

December 45 59.7 20.90 48 56.15 16.09 42.29 0.00 *** 1030445.5 0.01 * 5.9

08KH006

January 34 70.8 18.98 40 74.4 15.72 0.06 0.81 551871 0.00 *** 5.1

8.87 168.52

February 31 60.15 14.90 40 63.4 13.34 2.30 0.13 396141.5 0.00 *** 5.4

March 32 51.5 11.42 40 62.65 15.42 39.62 0.00 *** 340396 0.00 *** 21.7

April 37 106 68.94 40 143 81.54 60.44 0.00 *** 452130 0.00 *** 34.9

May 38 360 174.95 40 404 166.05 2.51 0.11 617736.5 0.00 *** 12.2

June 38 600 121.57 40 608 160.12 20.22 0.00 *** 656905 0.10

July 38 479 121.57 40 466 139.36 10.94 0.00 *** 750399 0.24



August 38 314 90.44 40 283 84.51 3.79 0.05 862901 0.00 *** 9.9

September 38 210 71.16 40 190 57.82 23.14 0.00 *** 777644.5 0.00 *** 9.5

October 38 167 48.18 40 161 54.86 3.78 0.05 826003 0.00 *** 3.6

November 38 133 45.96 40 137 47.44 0.21 0.65 623200 0.00 *** 3.0

December 37 93.4 27.58 40 94.5 24.46 0.12 0.73 646413 0.00 *** 1.2

FIGURE. PERCENTAGE CHANGE IN MEDIAN MONTHLY FLOW FOR HISTORIC VS RECENT PERIODS IN THE UPPER FRASER SUB-WATERSHED, BY STATION.



FIGURE. ANALYSIS OF VARIANCE IN MONTHLY FLOW FOR HISTORIC VS RECENT PERIODS IN THE UPPER FRASER RIVER SUB-WATERSHED, BY STATION.



TABLE. NON-PARAMETRIC COMPARISON OF VARIANCE FOR PRE VS POST DAM MONTHLY FLOWS IN THE THOMPSON SUB-WATERSHED.

Pre-Wilsey Dam (<1929) Post Wilsey Dam (>1929) Fligner-Killeen Mann-Whitney


Years of Sampling

Median Monthly

Flow (m3/s)



Number of Years of

Sampling

Median Monthly

Flow (m3/s)






Time Periods

Average Percentage

Change Across

Months*

Median Annual

Flow (m3/s)

08L - Thompson

08LC002

January 13 28.3 8.45 62 35.7 7.12 0.15 0.70 230775.5 0.00 *** 26.1

20.04 49.62

February 14 23.9 6.52 61 34.8 8.60 49.91 0.00 *** 120135 0.00 *** 45.6

March 15 23.2 6.38 61 38.8 12.16 110.61 0.00 *** 117155 0.00 *** 67.2

April 17 53.65 33.21 61 73.05 35.66 0.32 0.57 333455.5 0.00 *** 36.2

May 17 184 88.96 61 182 78.58 27.90 0.00 *** 517330 0.18

June 17 289 87.47 62 277 84.51 2.88 0.09 502749 0.03 * 4.2

July 17 167 91.92 63 137 79.17 0.02 0.88 576641.5 0.00 *** 18.0

August 18 63.4 20.90 63 55.2 19.72 0.41 0.52 615652.5 0.00 *** 12.9

September 18 43.9 11.71 63 41.5 13.20 0.02 0.88 569804.5 0.00 *** 5.5

October 18 39.75 14.90 63 41.1 12.60 19.91 0.00 *** 515820.5 0.13

November 18 44.05 17.87 62 46.2 14.83 11.48 0.00 *** 417951 0.00 *** 4.9

December 17 33.1 10.97 62 39.7 9.64 0.04 0.85 332321 0.00 *** 19.9

08LC003

January 12 14.2 2.97 67 22.8 6.38 169.84 0.00 *** 76496 0.00 *** 60.6

35.90 28.93

February 12 11.3 2.06 67 21.7 8.30 275.48 0.00 *** 80210 0.00 *** 92.0

March 11 11.3 4.15 67 20.6 8.75 190.78 0.00 *** 115037.5 0.00 *** 82.3

April 11 20.8 10.30 67 36.6 22.39 49.52 0.00 *** 198297.5 0.00 *** 76.0

May 12 102 69.16 67 107 50.41 44.70 0.00 *** 379360.5 0.58

June 13 167 54.86 67 156 51.89 2.23 0.14 423271 0.00 ** 6.6

July 13 73.6 39.88 67 66.3 37.66 0.58 0.45 449396 0.02 * 9.9

August 13 31.7 9.64 67 30.6 8.90 2.95 0.09 414775 0.78

September 13 22.7 5.26 67 27.5 6.75 0.00 0.97 295035.5 0.00 *** 21.1

October 13 22.7 10.82 68 26.8 6.82 65.22 0.00 *** 366215.5 0.00 *** 18.1

November 13 21.5 6.67 67 27.6 7.56 10.06 0.00 ** 222343.5 0.00 *** 28.4

December 13 18.1 4.30 66 24.6 6.82 52.68 0.00 *** 154296 0.00 *** 35.9



Pre-Sugar Lake Dam Raising (<1942) Post Sugar Lake Dam Raising (>1942) Fligner-Killeen Mann-Whitney


Years of Sampling

Median Monthly

Flow (m3/s)



Number of Years of

Sampling

Median Monthly

Flow (m3/s)






Time Periods

Average Percentage

Change Across

Months*

Median Annual

Flow (m3/s)

08L - Thompson 08LC018

January 11 10.1 4.30 41 18.8 3.85 11.27 0.00 *** 20852 0.00 *** 86.1

44.27 22.93

February 10 7.31 2.70 41 18.6 5.04 35.58 0.00 *** 29887.5 0.00 *** 154.4

March 11 9.77 3.48 41 18.3 7.26 133.82 0.00 *** 58582 0.00 *** 87.3

April 11 21.75 15.94 41 29.9 16.16 4.40 0.04 * 162329.5 0.00 *** 37.5

May 11 86.1 43.74 42 73 31.13 39.03 0.00 *** 259971 0.00 *** 15.2

June 11 120 29.87 42 116 40.03 14.98 0.00 *** 229731 0.00 ** 3.3

July 11 56.6 28.02 42 55.8 39.29 22.84 0.00 *** 240880.5 0.02 * 1.4

August 12 22.4 7.12 42 21.95 6.00 1.53 0.22 238855.5 0.52

September 12 17.3 6.52 41 21.3 5.49 9.39 0.00 ** 142475.5 0.00 *** 23.1

October 12 15.25 5.11 41 20.2 4.89 11.74 0.00 *** 137823 0.00 *** 32.5

November 11 15.95 9.80 41 20.7 6.08 73.23 0.00 *** 145811 0.00 *** 29.8

December 11 11.9 7.24 41 19.1 4.89 45.23 0.00 *** 87778.5 0.00 *** 60.5



FIGURE. PERCENTAGE CHANGE IN MEDIAN MONTHLY FLOW FOR PRE VS. POST DAM PERIODS IN THE THOMPSON SUB-WATERSHED, BY STATION.

FIGURE. ANALYSIS OF VARIANCE IN MONTHLY FLOW FOR PRE VS. POST DAM PERIODS IN THE THOMPSON RIVER SUB-WATERSHED, BY STATION.





TABLE. NON-PARAMETRIC COMPARISON OF VARIANCE FOR HISTORIC VS. RECENT AND PRE-DAM VS POST-DAM MONTHLY FLOW IN THE LOWER FRASER SUB-WATERSHED.

Historic <1948 Recent >1948 Fligner-Killeen Mann-Whitney


Years of Sampling

Median Monthly

Flow (m3/s)



Number of Years of

Sampling

Median Monthly

Flow (m3/s)






Time Periods

Average Percentage

Change Across

Months*

Median Annual

Flow (m3/s)

Weighted average


08M – Lower Fraser

08MA001

January 9 24.4 6.82 68 21.1 6.23 37.73 0.00 *** 293695.5 0.00 *** 13.5

9.45 59.95

14.84

February 7 18.4 8.15 64 18 4.89 36.53 0.00 *** 200203 0.00 ** 2.2

March 12 19.5 4.00 65 16.3 3.56 17.97 0.00 *** 396634.5 0.00 *** 16.4

April 14 20.6 7.71 68 17.3 4.30 87.11 0.00 *** 521663 0.00 *** 16.0

May 19 57.5 28.17 69 56.4 44.48 60.14 0.00 *** 614189 0.03 * 1.9

June 20 175.5 49.67 70 182 65.23 44.05 0.00 *** 546988 0.00 *** 3.7

July 20 215 45.96 70 234.5 49.67 5.93 0.01 * 558678.5 0.00 *** 9.1

August 20 217 38.55 70 204 41.51 0.43 0.51 798736 0.00 *** 6.0

September 20 145 48.93 70 120 35.58 58.34 0.00 *** 835889.5 0.00 *** 17.2

October 19 74.2 26.09 70 64.9 20.02 33.72 0.00 *** 786790 0.00 *** 12.5

November 19 43 16.75 70 41.6 12.60 7.36 0.01 ** 584574 0.03 * 3.3

December 14 32 8.38 69 28.3 9.64 4.55 0.03 * 456002.5 0.00 *** 11.6

08MA002

January 15 13.9 4.30 54 12.6 3.98 0.78 0.38 427503 0.00 *** 9.4

7.37 33.23

February 14 9.54 3.05 52 9.8 2.82 1.98 0.16 277535.5 0.17

March 15 8.16 2.28 57 8.62 2.64 1.38 0.24 304091 0.00 *** 5.6

April 15 7.84 3.07 68 8.74 3.20 6.00 0.01 * 359930.5 0.00 *** 11.5

May 18 20 9.93 69 18.1 11.12 13.87 0.00 *** 536391.5 0.11

June 18 72.8 25.50 69 75.3 31.88 41.46 0.00 *** 491916 0.00 *** 3.4

July 18 103 20.02 70 116 25.20 53.72 0.00 *** 459257.5 0.00 *** 12.6

August 19 104 16.31 70 104 18.83 5.25 0.02 * 639920 0.06

September 19 76.85 20.39 70 65.4 16.46 14.93 0.00 *** 786372 0.00 *** 14.9

October 18 43.9 10.97 69 39.5 10.53 2.80 0.09 699270 0.00 *** 10.0

November 19 29.4 9.64 61 26.2 7.41 0.22 0.64 556379 0.00 *** 10.9

December 18 19.9 6.23 57 17.9 5.49 9.93 0.00 ** 502889.5 0.00 *** 10.1

08MF005

January 35 807 235.73 69 920 249.08 0.12 0.73 855819 0.00 *** 14.0

14.88 1867.42

February 35 716 164.57 69 875 231.29 54.10 0.00 *** 573036 0.00 *** 22.2

March 36 671 146.78 69 868 228.32 110.36 0.00 *** 586291 0.00 *** 29.4

April 36 1300 776.88 69 1760 963.69 21.86 0.00 *** 807824.5 0.00 *** 35.4

May 36 4450 1838.42 69 4970 1808.77 0.05 0.83 1003881 0.00 *** 11.7

June 36 6850 1378.82 69 6820 1586.38 25.57 0.00 *** 1022777 0.00 *** 0.4



July 36 5320 1304.69 69 5210 1527.08 22.79 0.00 *** 1248417 0.03 * 2.1

August 36 3430 874.73 69 3260 815.43 0.00 0.97 1317442 0.00 *** 5.0

September 36 2285 496.67 69 2190 667.17 39.61 0.00 *** 1166807 0.04 * 4.2

October 36 1680 504.08 69 1880 607.87 5.99 0.01 * 1008813.5 0.00 *** 11.9

November 36 1270 504.83 69 1620 548.56 3.78 0.05 768672.5 0.00 *** 27.6

December 36 940 332.10 69 1080 354.34 2.12 0.15 970289 0.00 *** 14.9

Pre-Seton Main Dam <1956 Post Seton Main Dam >1956 Fligner-Killeen Mann-Whitney


Years of Sampling

Median Monthly

Flow (m3/s)



Number of Years of

Sampling

Median Monthly

Flow (m3/s)






Time Periods

Average Percentage

Change Across

Months*

Median Annual

Flow (m3/s)


08ME002

January 9 4.02 0.92 57 3.5 2.99 112.78 0.00 *** 293136 0.00 *** 12.9

43.34 6.60

February 9 3.85 0.67 56 3.245 2.71 255.63 0.00 *** 245267.5 0.00 *** 15.7

March 9 3.68 0.92 56 3.565 2.56 55.44 0.00 *** 275661 0.00 *** 3.1

April 10 6.14 4.06 54 4.3 3.91 15.17 0.00 *** 311008 0.00 *** 30.0

May 10 23.85 15.57 59 19.2 19.29 2.11 0.15 322289 0.00 *** 19.5

June 10 50.1 21.79 60 43 28.02 0.95 0.33 332256 0.00 *** 14.2

July 10 53.2 28.47 60 30.3 25.20 29.44 0.00 *** 448971.5 0.00 *** 43.0

August 11 24.1 8.90 59 2.965 2.58 13.21 0.00 *** 479923.5 0.00 *** 87.7

September 10 12.95 3.48 59 2.07 1.29 9.52 0.00 ** 425516 0.00 *** 84.0

October 9 9.06 4.51 59 1.83 1.10 27.97 0.00 *** 412524 0.00 *** 79.8

November 9 6.94 3.16 58 1.71 1.28 17.49 0.00 *** 362701 0.00 *** 75.4

December 9 5.52 1.88 58 2.495 2.54 33.44 0.00 *** 351719.5 0.00 *** 54.8

08ME003

January 11 9.91 8.39 63 8.75 3.69 353.77 0.00 *** 346038.5 0.00 *** 11.7

34.83 14.00

February 11 7.36 5.04 63 9.13 4.11 56.63 0.00 *** 247882 0.34

March 11 6.51 3.78 63 9.7 4.74 25.29 0.00 *** 314258.5 0.10

April 13 11.9 11.34 63 11.8 8.58 14.94 0.00 *** 385502.5 0.00 ** 0.8

May 13 43.9 26.39 63 20 18.10 22.49 0.00 *** 562264.5 0.00 *** 54.4

June 13 66.25 28.54 63 30.8 35.05 4.92 0.03 * 543298 0.00 *** 53.5

July 13 84.7 31.58 63 23.8 24.33 2.00 0.16 646545.5 0.00 *** 71.9

August 14 43.9 31.13 63 23.2 16.90 67.88 0.00 *** 582430.5 0.00 *** 47.2

September 13 26.1 21.94 63 13.5 3.71 373.69 0.00 *** 549987 0.00 *** 48.3

October 12 13.9 12.22 63 12.5 1.93 574.94 0.00 *** 384689 0.00 *** 10.1

November 12 24.5 29.61 63 11.7 3.20 1058.07 0.00 *** 427190.5 0.00 *** 52.2

December 12 27.15 31.68 63 8.75 3.62 1070.32 0.00 *** 489126.5 0.00 *** 67.8



Pre Alouette Dam <1926 Post Alouette Dam >1926 Fligner-Killeen Mann-Whitney


Years of Sampling

Median Monthly

Flow (m3/s)



Number of Years of

Sampling

Median Monthly

Flow (m3/s)






Time Periods

Average Percentage

Change Across

Months*

Median Annual

Flow (m3/s)


08MH005

October 5 16.4 17.60 49 2.57 1.90 523.88 0.00 *** 183466.5 0.00 *** 84.3

86.41% 3.69 November 5 35 27.13 49 3.71 2.27 424.14 0.00 *** 210235.5 0.00 *** 89.4

December 5 24.9 13.94 49 3.61 2.28 222.95 0.00 *** 213950.5 0.00 *** 85.5

Pre Lamont Creek Dam <2009 Post Lamont Creek Dam >2009 Fligner-Killeen Mann-Whitney


Years of Sampling

Median Monthly

Flow (m3/s)



Number of Years of

Sampling

Median Monthly

Flow (m3/s)






Time Periods

Average Percentage

Change Across

Months*

Median Annual

Flow (m3/s)


08MH147

January 25 11.4 9.15 8 11.25 8.12 1.87 0.17 92687 0.71

4.68 23.58

February 26 9.5 6.38 8 9.12 5.62 0.54 0.46 85744.5 0.37

March 26 13 9.05 8 14 10.95 5.50 0.02 * 96375 0.39

April 26 23.3 15.27 8 20.5 12.75 0.98 0.32 98732.5 0.20

May 26 49.45 26.46 8 49.3 18.90 19.92 0.00 *** 99482.5 0.54

June 26 64.4 21.05 8 63.3 17.79 0.06 0.81 100780 0.02 * 1.7

July 25 50.2 17.79 8 45.85 23.05 12.91 0.00 *** 103643.5 0.06

August 25 27.8 9.04 8 25.25 9.04 0.66 0.42 107333 0.00 ** 9.2

September 25 17.6 6.82 8 22 10.30 37.66 0.00 *** 68667 0.00 *** 25.0

October 25 17 13.83 8 20.45 18.01 11.46 0.00 *** 81374 0.00 ** 20.3

November 26 17.7 14.35 8 23.7 21.69 10.80 0.00 ** 75982 0.00 ** 0.0

December 25 9.47 5.63 8 9.255 6.02 1.23 0.27 99822.5 0.31



FIGURE. PERCENTAGE CHANGE IN MEDIAN MONTHLY FLOW FOR PRE VS. POST DAM PERIODS IN THE LOWER FRASER SUB-WATERSHED, BY STATION.



FIGURE. ANALYSIS OF VARIANCE IN MONTHLY FLOW FOR THE PRE VS. POST DAM PERIODS IN THE LOWER FRASER SUB-WATERSHED, BY STATION.





WATER QUALITY

OVERALL WATER QUALITY HEALTH SCORING

Sub-Basin

Basin

Water Quality

Indicator 08J -

Nechako

08K - Upper Fraser

08L - Thompson

08M - Lower Fraser

08P - Skagit

Exceedance of water quality

guidelines for aquatic

life

Exceedance of water quality thresholds.

Weighted average of exceedances of three

thresholds: water quality guidelines,90th

percentile and 77th percentile. Expressed as

a proportion of total measurements.

Reported for the last 5 years of monitoring.

Year - 2016-2020 2016-2020 2016-2020 - 2016-2020

Number of Stations

0 70 85 43 0 198

Value Data

Deficient 0.130 0.156 0.279

Data Deficient

0.173

Water Quality Health

Category

Data Deficient

Good Fair Poor Data

Deficient Fair

Water Quality Health Score

0 4 3 2 0 3

Variance of annual water quality score

Value NA 0.109 0.118 0.131 NA 0.113

Significant Mann-Kendal time-series test to

determine directional trend in proportion of exceedance of water quality thresholds.

Time Period

NA 2000-2020 2000-2020 2000-2020 NA 2000-2020

Trend NA Negative trend in

exceedance

Negative trend in

exceedance No trend NA

Negative trend in

exceedance

WATER QUALITY DATA SUFFICIENCY

Sub-Basin Basin

Wat

er

Qu

alit

y

Data Sufficiency Indicator 08J - Nechako 08K - Upper

Fraser 08L -


Fraser 08P - Skagit


Year of earliest available monitoring

1966 1984 1965 1972 - 1984

Number of monitoring stations available for earliest

monitoring 2 3 1 10 0 16

Number of sub-sub-basins with earliest available monitoring

stations 1 2 1 1 0 5

Year of most recently available monitoring

2015 2020 2020 2020 - 2020

Number of monitoring stations available within last five years

0 70 85 43 0 198

Number of sub-sub-basins within last five years

0 5 7 5 0 17

Percentage of samples with at least 10 elements measured

within last 5 years. 0% 65% 49% 45% 0% 53%

Number of years of sampling in last 10 years

0 10 10 10 0 10

Overall Data Sufficiency Category









MAP. EXCEEDANCE OF WATER QUALITY THRESHOLDS AS REPORTED FOR MONITORING STATIONS IN THE FRASER LOWER MAINLAND WATERSHED FOR THE FIVE MOST RECENT YEAR AVAILABLE.



TABLE. WATER QUALITY IN THE FRASER LOWER MAINLAND WATERSHED BASED ON PROPORTION OF EXCEEDANCE OF THREE THRESHOLDS: PROVINCIAL WATER QUALITY GUIDELINES, 75TH PERCENTILE OF HISTORICAL DIS TRIBUTION, AND 90TH PERCENTILE OF HISTORICAL DISTRIBUTION. REPORTED BY SUB-WATERSHED AND DATA SOURCE.

WSCSDA Source Year Number of

Contaminants Measured

Total Number of

Sites

Number of Measurements

Total Number of Guidelines

Exceedances

Proportion of Guideline Exceedance

Total Number of 90th Percentile

Exceedances

Proportion of 90th Percentile

Exceedance

Total Number of 75th Percentile

Exceedances

Proportion of 75th Percentile

Exceedance

Weighted Average Exceedance

5-years Weighted Average

08K - Upper Fraser

BCEMS 2020 10 6 75 6 0.08 0 0.00 14 0.19 0.07

0.130

BCEMS 2019 16 33 2269 305 0.13 155 0.07 432 0.19 0.12

EC 2019 15 5 657 111 0.17 36 0.05 134 0.20 0.14

BCEMS 2018 16 47 3490 385 0.11 276 0.08 704 0.20 0.12

EC 2018 15 5 1215 171 0.14 58 0.05 225 0.19 0.12

BCEMS 2017 17 49 3746 413 0.11 311 0.08 787 0.21 0.12

EC 2017 15 5 1133 169 0.15 43 0.04 215 0.19 0.12

BCEMS 2016 17 62 4769 788 0.17 549 0.12 1247 0.26 0.16

EC 2016 15 5 1269 189 0.15 39 0.03 208 0.16 0.11

08L - Thompson

BCEMS 2020 5 4 23 3 0.13 3 0.13 3 0.13 0.13

0.156

BCEMS 2019 15 24 785 125 0.16 97 0.12 219 0.28 0.17

EC 2019 15 3 474 83 0.18 53 0.11 140 0.30 0.17

BCEMS 2018 15 31 2163 304 0.14 285 0.13 615 0.28 0.16

EC 2018 15 3 787 136 0.17 98 0.12 252 0.32 0.18

BCEMS 2017 14 36 2313 387 0.17 310 0.13 709 0.31 0.18

EC 2017 15 3 813 126 0.15 112 0.14 239 0.29 0.17

BCEMS 2016 14 64 3197 482 0.15 233 0.07 653 0.20 0.13

EC 2016 15 3 811 131 0.16 84 0.10 199 0.25 0.16

08M - Lower Fraser

ARochaCan 2020 2 2 5122 101 0.02 5 0.00 352 0.07 0.02

0.279

BCEMS 2020 5 15 60 39 0.65 37 0.62 40 0.67 0.64

ARochaCan 2019 2 2 15012 5372 0.36 1021 0.07 3524 0.23 0.24

BCEMS 2019 13 20 1119 318 0.28 213 0.19 366 0.33 0.26

EC 2019 15 6 1026 258 0.25 197 0.19 393 0.38 0.25

ARochaCan 2018 2 2 4468 1835 0.41 862 0.19 933 0.21 0.30

BCEMS 2018 14 23 1551 448 0.29 193 0.12 440 0.28 0.23

EC 2018 15 6 1456 364 0.25 156 0.11 399 0.27 0.21

BCEMS 2017 14 24 1315 350 0.27 199 0.15 423 0.32 0.24

EC 2017 15 6 1540 417 0.27 227 0.15 509 0.33 0.24

BCEMS 2016 13 13 739 136 0.18 90 0.12 181 0.24 0.17

EC 2016 15 6 1973 553 0.28 197 0.10 649 0.33 0.23



FIGURE. ANALYSIS OF VARIANCE IN EXCEEDANCE OF WATER QUALITY THRESHOLDS OVER TIME FOR MONITORING STATIONS IN THE FRASER LOWER MAINLAND WATERSHED, BY SUB-WATERSHED.



TABLE. PROPORTION OF MEASUREMENTS EXCEEDING THE WATER QUALITY THRESHOLDS, IN THE FRASER BASIN, BY PARAMETER MEASURED, FOR THE FIV E MORE RECENTLY AVAILABLE YEARS.

variable 08K - Upper Fraser 08L - Thompson 08M - Lower Fraser Entire Basin

Measurement exceedances ratio Measurement exceedances ratio Measurement exceedances ratio Measurement exceedances ratio

aluminium 1410 646 0.46 1684 868 0.52 2190 1767 0.81 5284 3281 0.62

ammonia 261 39 0.15 534 76 0.14 398 42 0.11 1193 157 0.13

arsenic 3707 35 0.01 1889 6 0.00 2423 4 0.00 8019 45 0.01

cadmium 2798 372 0.13 1503 248 0.17 2535 1202 0.47 6836 1822 0.27

chloride 728 0 0.00 234 0 0.00 407 0 0.00 1369 0 0.00

copper 3558 473 0.13 1923 158 0.08 2621 337 0.13 8102 968 0.12

dissolved.oxygen 1522 9 0.01 1517 35 0.02 14857 7385 0.50 17896 7429 0.42

iron 3596 959 0.27 2125 709 0.33 2595 1944 0.75 8316 3612 0.43

lead 2300 8 0.00 1780 22 0.01 2532 61 0.02 6612 91 0.01

mercury 17 0 0.00 3 0 0.00 0 0 - 20 0 0.00

nickel 3056 15 0.00 1913 8 0.00 2594 133 0.05 7563 156 0.02

nitrite 219 219 1.00 0 0 - 0 0 - 219 219 1.00

nitrogen 2969 341 0.11 2069 143 0.07 2383 694 0.29 7421 1178 0.16

ph 1436 17 0.01 2011 67 0.03 14827 8 0.00 18274 92 0.01

phosphorus 2945 596 0.20 2251 1188 0.53 2669 1832 0.69 7865 3616 0.46

uranium 2251 0 0.00 1772 2 0.00 2442 0 0.00 6465 2 0.00

zinc 2232 1471 0.66 1857 749 0.40 2578 1679 0.65 6667 3899 0.58

TOTAL 35005 5200 0.15 25065 4279 0.17 58051 17088 0.29 118121 26567 0.22



FIGURE. ANALYSIS OF VARIANCE IN EXCEEDANCE OF WATER QUALITY THRESHOLDS OVER TIME FOR MONITORING STATIONS IN THE FRASER LOWER MAINLAND WATERSHED, BY CONTAMINANT.





TABLE. RESULTS OF MANN-KENDALL NON-PARAMETRIC TREND ANALYSIS OF ANNUAL EXCEEDANCE OF WATER QUALITY THRESHOLDS OVER TIME IN THE FRASER LOWER MAINLANDWATERSHED, BY SUB-WATERSHED.

WSCSDA Source Start Year

End Year

Number of Years

Number of Sites

Theil-Sen Slope

Mann-Ken Score

Mann-Ken p-value

Fraser Basin

All 2000 2020 21 207 -0.01 -139 0.00 ***

BCEMS 2015 2020 6 190 0.00 0 1.00

EC 2000 2019 20 15 0.00 -91 0.00 **

08K - Upper Fraser

All 2000 2020 21 80 0.00 -91 0.01 **

BCEMS 2015 2020 6 75 -0.01 -8 0.16

EC 2000 2019 20 5 0.00 -63 0.04 *

08L - Thompson

All 2000 2020 21 87 0.00 -100 0.00 **

BCEMS 2015 2020 6 83 0.00 -1 1.00

EC 2000 2019 20 4 0.00 -83 0.01 **

08M - Lower Fraser

All 2000 2020 21 40 -0.01 -59 0.08

ARochaCan 2018 2020 3 2 NA NA NA

BCEMS 2015 2020 6 32 0.05 5 0.47

EC 2000 2019 20 6 -0.01 -76 0.01 *



FISH

OVERALL FISH HEALTH SCORING

Basin

Fish


Fraser 08L - Thompson

08M - Lower Fraser

08P - Skagit

Change in Native Fish

Species Richness

Period of Study 1930-2019 1927-2019 1902-2019 1908-2020 1923-2018 1902-2020

Number of Sites

2978 5386 2792 6417 16 17361

Presence of statistically significant decline in number of total species observed per

year.

Trend No No No

Trend seen with A Rocha

data only, overall no

trend

No No

Presence of statistically significant decline in median

species richness for the basin. Trend No No No No No No

Fish Health Category

Good Good Good Good Good Good

Fish Health Score

4 4 4 4 4 4

FISH DATA SUFFICIENCY

Basin

Fish

Data Sufficiency Indicator 08J - Nechako 08K - Upper Fraser 08L - Thompson 08M - Lower Fraser 08P - Skagit


Year of earliest available monitoring 1930 1927 1902 1908 1923 1930

Number of sampling locations available for earliest monitoring

1 3 1 2 1 8

Number of sub-sub-basins with earliest available sampling locations

1 1 1 1 1 5

Earliest year of continuous monitoring 1973 1952 1927 1929 1983 1927

Number of sampling locations available for first year of continuous monitoring

5 1 1 4 1 12

Number of sub-sub-basins for first year of continuous monitoring

1 1 1 3 1 7

Year of most recently available monitoring 2019 2019 2019 2020 2018 2019


58 372 125 1295 4 1854


5 8 6 7 1 27


10 10 10 10 1 10

Overall Data Sufficiency Category Sufficient Sufficient Partially Sufficient Partially Sufficient Moderately





MAP. NUMBER OF NATIVE FISH SPECIES OBSERVED IN THE FRASER LOWER MAINLAND WATERSHED (2015-2019).



FIGURE.NON-PARAMETRIC ANALYSIS OF VARIANCE IN FISH SPECIES RICHNESS IN THE FRASER LOWER MAINLAND WATERSHED (1902-2019), BY SUB-WATERSHED.

Data source FISS represents the Ministry of Environment and Climate Change Strategy, British Columbia Government, Known BC Fish Observations and BC Fish Distributions (includes official provincial databases and FISS).

FIGURE.TIME-SERIES OF MEDIAN NATIVE FISH SPECIES RICHNESS IN THE NECHAKO SUB-WATERSHED (1930-2019)

FIGURE.TIME-SERIES OF MEDIAN NATIVE FISH SPECIES RICHNESS IN THE UPPER FRASER SUB-WATERSHED (1927-2019)



FIGURE.TIME-SERIES OF MEDIAN NATIVE FISH SPECIES RICHNESS IN THE THOMPSON SUB -WATERSHED (1902-2019).

FIGURE.TIME-SERIES OF MEDIAN NATIVE FISH SPECIES RICHNESS IN THE LOWER FRASER SUB-WATERSHED (1908-2020).

FIGURE.TIME-SERIES OF MEDIAN NATIVE FISH SPECIES RICHNESS IN THE SKAGIT SUB-WATERSHED (1923-2018).



FIGURE.TIME-SERIES OF MEDIAN FISH SPECIES RICHNESS IN THE FRASER LOWER MAINLANDWATERSHED (1902 -2020).

FIGURE.TIME-SERIES OF TOTAL FISH SPECIES RICHNESS IN THE NECHAKO RIVER SUB -WATERSHED (1930 -2019).

FIGURE.TIME-SERIES OF TOTAL FISH SPECIES RICHNESS IN THE UPPER-FRASER LOWER MAINLANDSUB-WATERSHED (1927 -2019).

FIGURE.TIME-SERIES OF TOTAL FISH SPECIES RICHNESS IN THE THOMPSON RIVER SUB -WATERSHED (1902 -2019).



FIGURE.TIME-SERIES OF TOTAL FISH SPECIES RICHNESS IN THE LOWER-FRASER RIVER SUB-WATERSHED (1908 -2020).

FIGURE.TIME-SERIES OF TOTAL FISH SPECIES RICHNESS IN THE SKAGIT SUB -WATERSHED (1923 -2018).

FIGURE.TIME-SERIES OF TOTAL FISH SPECIES RICHNESS IN THE FRASER LOWER MAINLAND WATERSHED (1902 -2019).



TABLE. RESULTS OF MANN-KENDALL NON-PARAMETRIC TREND ANALYSIS OF FISH SPECIES RICHNESS OVER TIME IN THE FRASER LOWER MAINLAND WATERSHED, BY SUB-WATERSHED.

Analysis Source WSCSDA Start Year Theil-Sen Slope Mann-Ken Score Mann-Ken p-value

Total Species Richness

FISS Fraser Basin 1902 -0.12 -1362.00 0.00 **

FISS 08J - Nechako 1902 0.00 88.00 0.76

FISS 08K - Upper Fraser 1902 -0.06 -452.00 0.13

FISS 08L - Thompson 1902 -0.09 -1344.00 0.00 **

FISS 08M - Lower Fraser 1902 -0.16 -1533.00 0.00 ***

FISS 08P - Skagit 1902 0.00 -78.00 0.81

ARochaCan 08M - Lower Fraser 2011 -2.00 -26.00 0.02 *

ARochaCan;FISS Fraser Basin 1981 -0.44 -156.00 0.06

Median Species

Richness

ARochaCan Fraser Basin 2011 0.00 -1.00 1.00

ARochaCan 08M - Lower Fraser 2011 0.00 -1.00 1.00

FISS Fraser Basin 1902 0.00 -116.00 0.68

FISS 08J - Nechako 1902 0.00 57.00 0.77

FISS 08K - Upper Fraser 1902 0.00 -67.00 0.75

FISS 08L - Thompson 1902 0.00 49.00 0.86

FISS 08M - Lower Fraser 1902 0.00 -70.00 0.75

FISS 08P - Skagit 1902 0.00 27.00 0.87

ARochaCan;FISS Fraser Basin 1981 0.00 -12.00 0.84



BENTHICS

OVERALL BENTHIC HEALTH SCORING

Benthic Macro-Invertebrates



08M - Lower Fraser

08P - Skagit Value

Index of benthic community composition

based on sensitivity to disturbance

Median Hilsenhoff

Biotic Index (HBI) score for

the basin. Reported as a

weighted average for the

most recent five years.

Year 2015-2018 2015-2019 2015-2019 2015-2019 - 2015-2019

Number of Sites 2 17 17 19 0 55

Value 4.65 3.17 3.18 3.34 Data deficient 3.29

Benthic Health Category

Data deficient Very Good Very Good Very Good Data deficient Very Good

Benthic Health Score

0 5 5 5 0 5

Variance of annual HBI

scores Value 0.47 0.56 0.100 0.077 NA 0.580

Significant Mann-Kendal

time-series test to determine

directional trend in HBI over time.

Time Period 1994-2018 1994-2019 1994-2019 1994-2019 NA 1994-2019

Trend None None None Significant

decrease over time

NA Significant

decrease over time

BENTHIC DATA SUFFICIENCY

Sub-basin

Basin

Ben

thic

Mac

ro-I

nve

rte

bra

tes

Data Sufficiency Indicator 08J - Nechako 08K - Upper


08M - Lower Fraser

08P - Skagit


Year of earliest available monitoring 1994 1994 1994 1994 - 1994

Number of monitoring stations available for earliest monitoring

14 9 16 32 0 71

Number of sub-sub-basins with earliest available monitoring stations

2 6 4 8 0 20

Year of most recently available monitoring

2018 2019 2019 2019 - 2019


2 17 17 19 0 55


1 5 6 5 0 17


8 10 10 10 0 38

Overall Data Sufficiency Category Insufficient Partially Sufficient Partially Sufficient Partially Sufficient Insufficient Partially Sufficient




MAP. HILSENHOFF'S BIOTIC INDEX SCORES FOR BENTHIC MACRO-INVERTEBRATE COMMUNITIES IN THE FRASER LOWER MAINLAND WATERSHED (2014-2019).



FIGURE. ANALYSIS OF VARIANCE FOR HILSENHOFF'S BIOTIC INDEX VALUES FOR BENTHIC MACRO -INVERTEBRATE COMMUNITIES SAMPLED IN THE FRASER LOWER MAINLANDWATERSHED (1994-2019).

*Source: CABIN, 2020 (Including Sources from Environment Canada, PN Mainstream, BC MOE, PYR Demo and Training, Streambank Stabilization Project BC, Test Study, BC NGO, Beece Cr. WQ Study, DFO, Hyde Creek Study, Marshall Creek Abbotsford, Skagit River Watershed).



TABLE. HILSENHOFF'S BIOTIC INDEX VALUSES FOR BENTHIC MACRO-INVERTEBRATE COMMUNITIES SAMPLED IN THE FRASER LOWER MAINLANDWATERSHED, BY YEAR, SUB-WATERSHED AND DATA SOURCE.

Year Sub-watershed Source

Number of Sites HBI

5-Year Weighted Average

2018

08J - Nechako

CABIN 2 3.91

4.65

2017 CABIN 1 5.45

2016 CABIN 1 5.52

2015 CABIN 2 4.56

2019

08K - Upper Fraser

CABIN 3 3.47

3.17

2018 CABIN 3 2.49

2017 CABIN 6 3.55

2016 CABIN 5 2.74

2015 CABIN 10 3.27

2019

08L - Thompson

CABIN 4 2.86

3.18

2018 CABIN 10 3.14

2017 CABIN 10 3.41

2016 CABIN 4 3.58

2015 CABIN 6 2.81

2019

08M - Lower Fraser

CABIN 5 2.74

3.34

2018 CABIN 4 3.27

2017 CABIN 7 3.38

2016 CABIN 4 3.38

2015 CABIN 9 3.66


TABLE. RESULTS OF MANN-KENDALL NON-PARAMETRIC TREND ANALYSIS OF HILSENHOFF'S BIOTIC INDEX OVER TIME IN THE FRASER LOWER MAINLANDWATERSHED, BY SUB-WATERSHED.

Data Source WSCSDA Start Year

End Year

Number of Sites

Theil-Sen Slope

Mann-Kendall Test

Statistic

Mann-Kendall Test p-value

CABIN*

Fraser Lower Mainland 1994 2019 1005 -0.05 -128 0.01 **

08J - Nechako 1994 2018 203 0.01 39 0.37

08K – Upper Fraser 1994 2019 290 0.00 -9 0.86

08L - Thompson 1994 2019 153 0.00 -15 0.76

08M – Lower Fraser 1994 2019 359 -0.07 -143 0.00 **



Disclaimer: This analysis reflects currently accessible and available data that aligns with our nationally consistent suite of indicators, as of February 2017.

FRESHWATER THREATS ASSESSMENT

SUMMARY

TABLE. OVERALL SCORING RESULTS FRESHWATER THREATS ASSESSMENT OF FRASER LOWER MAINLAND WATERSHED, BY SUB-WATERSHED AND PEARSE WATERSHED

PEARSE BASIN

SUB WATERSHED SCORE

WSCSDA SUB WATERSHED

NAME SCORE FINAL -

MEDIAN

Fraser Lower-

Mainland

08J Nechako THREAT CLASSIFICATION High

SCORE 73.33

08K Upper Fraser THREAT CLASSIFICATION High

SCORE 60

08L Thompson THREAT CLASSIFICATION High

SCORE 60

08M Lower Fraser THREAT CLASSIFICATION High

SCORE 66.67

08P Skagit THREAT CLASSIFICATION Low

SCORE 20

OVERALL PEARSE BASIN SCORE

THREAT CLASSIFICATION High

SCORE 63.86

TABLE. SCORING RESULTS FRESHWATER THREAT INDICATORS OF FRASER LOWER MAINLAND WATERSHED, BY SUB-WATERSHED AND PEARSE WATERSHED

PEARSE BASIN

SUB WATERSHED SCORE

WSCSDA SUB WATERSHED NAME INDICATOR POLLUTION CLIMATE CHANGE ALTERATION OF WATER FLOWS

INVASIVE SPECIES FRAGMENTATION WATER USE

HABITAT LOSS

WATERSHED AREA (m2)

RELATIVE WATERSHED AREA

Fraser Lower-Mainland

08J Nechako THREAT CLASSIFICATION Low Moderate High Unknown Very High Low High

46,446,643,604 20.18%

SCORE 40 66.67 80 -9999 90 25 80

08K Upper Fraser THREAT CLASSIFICATION Very High Moderate Very low Low Very High Low Moderate

66,037,201,699 28.70%

SCORE 100 66.67 20 40 90 25 60

08L Thompson THREAT CLASSIFICATION High Moderate Low Moderate High Low Moderate

55,435,935,008 24.09%

SCORE 80 66.67 40 60 80 25 60

08M Lower Fraser THREAT CLASSIFICATION High Moderate Moderate High High Low Moderate

61,161,496,436 26.58%

SCORE 80 66.67 60 80 70 25 60

08P Skagit THREAT CLASSIFICATION Very low Moderate No threat reported Unknown Unknown Low Very low

1,032,404,175 0.45%

SCORE 20 66.67 0 -9999 -9999 25 20

OVERALL PEARSE BASIN SCORE

THREAT CLASSIFICATION High Moderate Moderate Moderate Very High Low High

SCORE 77.4 66.67 47.47 47.2 81.87 25 63.86



SUB-INDICATOR SCORES BY SUB-WATERSHED

POLLUTION

TABLE. SCORING RESULTS OF POLLUTION THREAT BY SUB-INDICATOR AND SUB-WATERSHED

SUB-INDICATOR

Point Source Pollution Pipeline incidents Transporation Incidents Agricultural Contamination

SUB-SUB-INDICATOR

Risk of Water Contamination by N

Risk of Water Contamination by Pesticides

Risk of Water Contamination by P

WSCSDA SUB WATERSHED NAME Value Score

Threat Classification

Value Score Threat

Classification Value Score


Value Score Threat

Classification Value Score Threat Classification Value Score


08J Nechako 38.45 20 Very Low -9999

-9999

Unknown 7 20 Very Low 0.34 40 Low 0.21 40

Low 0.21 40

Low

08K Upper Fraser 24454.48 100 Very High 693062 60 Moderate 2 20 Very Low 0.26 40 Low 0.21 40 Low 0 20 Very Low

08L Thompson 10067.41 80 High 11000 20 Very Low 10 40 Low 0.59 60 Moderate 0.55 60 Moderate 0.57 60 Moderate

08M Lower Fraser 23639.39 80 High 1858000 60 Moderate 11 40 Low 0.32 40 Low 0.21 40 Low 0.77 60 Moderate

08P Skagit 0 0 None 0 0 None 0 0 None 0 0 None 0 0 None 0 20 Very Low

CLIMATE CHANGE

TABLE . SCORING RESULTS OF CLIMATE CHANGE THREAT BY SUB-INDICATOR AND SUB-WATERSHED

SUB-INDICATOR

Spring Precipitation Anomaly

Summer Maximum Temperature Anomaly

Summer Precipiation Anamoly Winter Mean Temperature Anamoly

WSCSDA SUB WATERSHED NAME Value Score Threat Classification Value Score Threat Classification Value Score Threat Classification Value Score Threat Classification

08J Nechako 0.06 33.33 Low -0.65 66.67 Moderate -0.1 66.67 Moderate -0.1 66.67 Moderate

08K Upper Fraser 0.08 33.33 Low -0.28 33.33 Low 0.05 33.33 Low -0.05 66.67 Moderate

08L Thompson 0.12 33.33 Low 0.27 33.33 Low -0.07 66.67 Moderate -0.12 33.33 Low

08M Lower Fraser 0.13 33.33 Low -0.1 33.33 Low -0.02 33.33 Low -0.14 66.67 Moderate

08P Skagit 0.27 66.67 Moderate 0.23 33.33 Low -0.14 66.67 Moderate -0.29 33.33 Low



ALTERATION OF WATER FLOWS

TABLE. SCORING RESULTS OF ALTERATION OF WATER FLOWS THREAT BY SUB-INDICATOR AND SUB-WATERSHED

SUB-INDICATOR

Area of Reservoirs/Dams

WSCSDA SUB WATERSHED NAME Value Score Threat Classification

08J Nechako 782.4 80 High

08K Upper Fraser 5.3 20 Very Low

08L Thompson 22.7 40 Low

08M Lower Fraser 139.6 60 Moderate

08P Skagit 0 0 None

INVASIVE SPECIES

TABLE. SCORING RESULTS OF INVASIVE SPECIES THREAT BY SUB-INDICATOR AND SUB-WATERSHED

SUB-INDICATOR

Presence of Invasive Species


08J Nechako -

9999 -

9999 Unknown

08K Upper Fraser 7 40 Low

08L Thompson 15 60 Moderate

08M Lower Fraser 31 80 High

08P Skagit -

9999 -

9999 Unknown

WATER USE

TABLE. SCORING RESULTS OF WATER USE THREAT BY SUB-INDICATOR AND SUB-WATERSHED

SUB-INDICATOR

Water Use


08J Nechako N/A 25 Low

08K Upper Fraser N/A 25 Low

08L Thompson N/A 25 Low

08M Lower Fraser N/A 25 Low

08P Skagit N/A 25 Low

FRAGMENTATION

TABLE. SCORING RESULTS OF FRAGMENTATION THREAT BY SUB-INDICATOR AND SUB-WATERSHED

SUB-INDICATOR

Fragmentation by dams Fragmentation by roads and rail

WSCSDA SUB WATERSHED NAME Value Score Threat Classification Value Score Threat Classification

08J Nechako 1 100 Very High 0 80 High

08K Upper Fraser 1 100 Very High 0 80 High

08L Thompson 0.61 60 Moderate 0.01 100 Very High

08M Lower Fraser 0.64 60 Moderate 0 80 High

08P Skagit -

9999 -

9999 Unknown -

9999 -

9999 Unknown

HABITAT LOSS

TABLE. SCORING RESULTS OF HABITAT LOSS THREAT BY SUB-INDICATOR AND SUB-WATERSHED

SUB-INDICATOR

Land use/Land cover Forest loss

WSCSDA SUB WATERSHED NAME Value Score Threat Classification Value Score Threat Classification

08J Nechako 1.96 40 Low 12.32 80 High

08K Upper Fraser 1.16 20 Very Low 5.33 60 Moderate

08L Thompson 1.45 20 Very Low 7.39 60 Moderate

08M Lower Fraser 3.24 40 Low 5.54 60 Moderate

08P Skagit 0.08 20 Very Low -0.87 0 None

Documents

FRASER-LOWER MAINLAND WATERSHED REPORT · 2020. 10. 15. · OVERALL HYDROLOGY RIVER HEALTH SCORING Basin Hydrology Indicator 08J - Nechako 08K - Upper Fraser 08L - Thompson 08M -