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MIGHTY RIVER POWER Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought and Flood conditions 1

Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

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Page 1: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Healthy Rivers CSG 2 July 2015

Waikato River Hydrology Presentation

Lake Taupo

David Payne

Waikato Hydro System Catchment

Drought and Flood conditions

1

Page 2: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWERMIGHTY RIVER POWER

Lake Taupo

2

Page 3: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWERMIGHTY RIVER POWER

Lake Taupo catchment

3

Page 4: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWERMIGHTY RIVER POWER

Lake Taupo water level, rainfall and flow stations

4

Page 5: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWERMIGHTY RIVER POWER

Lake Taupo mean Monthly inflow

5

Page 6: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Taupo lake level ranges

6

Page 7: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Top 5 Lake Taupo facts

> The available lake Taupo storage is 855 Mm3 (1.4m range and 611 Km2 Lake area)

> The available storage is used on average 5 to 6 times a year

> The size of the hydro dams and reservoirs is such that the water obtained as a result of rainfall is

able to be used for generation purposes

> Mighty River Power has operated the Waikato Hydro Scheme since 1998 and during that time the

annual inflow versus outflow of Lake Taupo has not varied by more than 5%.

> The aim is to have the lake around 356.8 to 357.0 masl at the start of the year for drought

contingency purposes.

7

Page 8: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Waikato Hydro System

Catchment

PRESENTATION TITLE (UPDATE THROUGH HEADER & FOOTER) 8

Page 9: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Waikato Hydro System catchments

PRESENTATION TITLE (UPDATE THROUGH HEADER & FOOTER) 9

Page 10: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Waikato Hydro System dam elevations

PRESENTATION TITLE (UPDATE THROUGH HEADER & FOOTER) 10

Total storage Lake Taupo 93%Total Storage WHS 7%

Page 11: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Modelled dam residence times

> The dam residence time below are based on Opus modelling for the report “Waikato Catchment

Water Quality Model” (2000), Rutherford etal

> Residence time for a natural catchment from Taupo to the sea is 5 to 6 days

> Residence time for low flows to pass through the hydro system (Taupo to Karapiro) is 30 days, from

Taupo to the sea it is 35 days

> Residence time for mean flows to travel from Taupo to the sea is 23 days

> Residence time for high flows to travel from Taupo to the sea is 15 days

> ENVCO conducted some flow velocity measurements for the hydro system

PRESENTATION TITLE (UPDATE THROUGH HEADER & FOOTER) 11

Page 12: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Waikato Hydro System inflow versus Karapiro dam outflow

12

0

50

100

150

200

250

300

350

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

Flo

w (

m3 /

s)

Months

WHS Inflow

Karapiro Outflow

Page 13: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER 13

Operation under

drought conditions

Page 14: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Lake level under drought conditions

14

Page 15: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Operation under flood

Conditions

15

Page 16: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Taupo inflow and outflow

16

1357

998960 986

1024

206

315 293 318 317

0

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1958 1998 2001 2004 2011

Flo

w (

cum

ecs

)

Flood Years

Inflow

Outflow

Page 17: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Lake Taupo flood inflow, outflow and level graph

17

20-Jan-2011 25-Jan-2011 30-Jan-2011 4-Feb-2011

0

200

400

600

800

1000

1200

357.00

357.08

357.17

357.25

357.33

357.42

357.50

Flo

w

(c

um

ec

s)

Flo

w

(c

um

ec

s)

Lake Taupo Total Inflow (m3/sec)Lake Taupo Total Outflow (m3/sec)Lake Taupo Lake Level (m)

Page 18: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Waikato Hydro System inflow and Karapiro outflow

18

1094 1120

661

897

631580 566 551

0

200

400

600

800

1000

1200

1998 2004 2008 2011

Flo

w (

cum

ecs

)

Flood Years

No WHS

KPO Outflow

Page 19: Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River Hydrology Presentation Lake Taupo David Payne Waikato Hydro System Catchment Drought

MIGHTY RIVER POWER

Waikato Hydro System inflow and Karapiro outflow (2011 event)

19

22-Jan-2011 24-Jan-2011 26-Jan-2011 28-Jan-2011

0

100

200

300

400

500

600

700

800

900

1000

Flo

w

(c

um

ec

s)

Flood Information No WHS Flow CertifiedKarapiro Total Outflow (m3/sec)