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Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River...
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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
Transcript of Healthy Rivers CSG 2 July 2015 Waikato River Hydrology Presentation · 2017-01-23 · Waikato River...
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
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Lake Taupo
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Lake Taupo catchment
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Lake Taupo water level, rainfall and flow stations
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Lake Taupo mean Monthly inflow
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Taupo lake level ranges
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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.
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Waikato Hydro System
Catchment
PRESENTATION TITLE (UPDATE THROUGH HEADER & FOOTER) 8
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Waikato Hydro System catchments
PRESENTATION TITLE (UPDATE THROUGH HEADER & FOOTER) 9
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Waikato Hydro System dam elevations
PRESENTATION TITLE (UPDATE THROUGH HEADER & FOOTER) 10
Total storage Lake Taupo 93%Total Storage WHS 7%
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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
MIGHTY RIVER POWER
Waikato Hydro System inflow versus Karapiro dam outflow
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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
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Operation under
drought conditions
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Lake level under drought conditions
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Operation under flood
Conditions
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Taupo inflow and outflow
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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
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Lake Taupo flood inflow, outflow and level graph
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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)
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Waikato Hydro System inflow and Karapiro outflow
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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
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Waikato Hydro System inflow and Karapiro outflow (2011 event)
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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)
