Snowy-Murray Development Engineering 2 Sheet Fact

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The Snowy Scheme developments Snowy-Murray Development Engineering 2 sheet Fact Snowy-Murray Power Generation – the Development journey of water SNOWY-TUMUT DEVELOPMENT Water in the Snowy River is diverted at Guthega pumping Dam through Guthega Power Station and power BLOWERING TOOMA OGILVIES INTAKE RESERVOIR stationRESERVOIR DEEP CREEK back into Island Bend Dam. Water from Geehi 1 500 METRES stations OUTSTATION INTAKE JOUNAMA TALBINGO INTAKE BURNS CREEKReservoir, Geehi River, Island Bend and Lake 4 PONDAGE RESERVOIR INTAKE 1 200 1 BLOWERING JOUNAMA TUMUT 3 Eucumbene passes through Murray 1 and POWER SMALL POWER 900 STATION HYDRO STATION Murray 2 power stations. Khancoban DamMURRUMDGEE RVER POWER STATION 600 TUMUT RVER regulates water released from Murray 2 Power generating units TUMUT 2 TUMUT POND LAKE EUCUMBENE TANTANGARA 300 PONDAGE StationRESERVOIR down the Swampy Plains River, whichRESERVOIR TO MURRUMDGEE17 TUMUT 2 TUMUTis 1a tributaryHAPPY of JACKS the Upper River Murray. 0 RRGATON AREA POWER STATION POWER PONDAGE STATION Power or pumping station Underground power station Tunnels and shafts SNOWY-MURRAYSNOWY-MURRAY DEVELOPMENT DEVELOPMENT 2 100 METRES MURRAY 2 MURRAY 1 BOURKES GEEHI GUTHEGA ISLAND BEND JINDABYNE LAKE EUCUMBENE POWER POWER GORGE RESERVOIR PONDAGE PONDAGE PUMPING STATION STATION STATION INTAKE 1 800 BURRUNGUBUGGE LAKE JINDABYNE KHANCOBAN INTAKE PONDAGE JINDABYNE MINI HYDRO 1 500 SNOWY 1 200 RVER GEE RVER 900 SNOWY RVER RVER EUUMENE RVER 600 TO PA OEAN RVER 300 GEE PLAN TO MURRAY SWAMPY MURRAY 2 PONDAGE GUTHEGA POWER STATION 0 RRGATON AREA Power or pumping station Tunnels and shafts About inflows Inflows into Guthega Pondage are seasonal, with a large catchment area and a small reservoir, which can often result in the dam spilling (overtopping due to high inflows), particularly during the snow melt period or sustained high rainfall events. Island Bend Reservoir – Water from Island Bend can be diverted either east into Lake Eucumbene for long-term storage, or west to Geehi Reservoir for short-term energy for power generation. The water is transferred through an underground tunnel system. High flows – water diversions Low flows – water diverted to Geehi to Lake Eucumbene for storage. Reservoir to support generation. Guthega Dam Did you know Water from Lake Jindabyne cannot be pumped back to Lake Eucumbene, or to Island Bend Reservoir. Jindabyne Pumping Jindabyne Mini-hydro Station Power Station The Jindabyne Pumping Station transfers water The Jindabyne Mini-hydro Power Station allows from Lake Jindabyne into Geehi Reservoir, at Snowy Hydro to recover a small amount of times of high electricity supply and low demand. electricity from some of the environmental Water can also be moved the other direction water releases made from Lake Jindabyne Dam from Geehi back through a bypass valve into into the Snowy River. Lake Jindabyne when inflows are high and there is a low market need for the energy. Due to the intermittency of wind and solar generation, periods of excess supply usually occur between 7am-6pm. Jindabyne Pumping Station Visit us at: snowyhydro.com.au.

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Assessment of Thermal Pollution in the Snowy River Below Jindabyne
Assessment of thermal pollution Snowy River Increased Flows Assessment of thermal pollution in the Snowy River below Jindabyne Dam Summary This study assessed water temperature in the highly regulated Snowy River below Jindabyne Dam. What did we study? • The thermal regime of rivers plays a critical role in the health of aquatic ecosystems. We monitored water temperature below Jindabyne Dam to assess the thermal regime of the regulated Snowy River. Monitoring began in 2011, following the installation of a multi-level offtake and the delivery of environmental flows. It continued until 2013. During this time we compared the regulated thermal regime with a natural thermal regime model. The model was developed using pre-dam (1962-1967) water temperature data. What did we find? • Cold water pollution in the Snowy River below Jindabyne Dam is not a significant issue. • Warm water pollution remains an issue in the regulated Snowy River, particularly between March and July. Yet water temperatures are rarely more than 2 - 4°C warmer than natural. Temperatures never exceed the expected natural temperature range of the Snowy River before Jindabyne Dam. • Water temperatures match the expected natural water temperatures at the town of Dalgety. This is approximately 20km downstream of Jindabyne Dam. What does this mean for water management? • The multi-level offtake has improved the thermal regime in this regulated river. Additional management strategies to improve the thermal regime are limited. An alternate release point in the Mowamba River may further improve water temperatures. The extent of improvements would depend on the dilution of flow volumes from the Mowamba River into the Snowy River.
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Concept Plan
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