This line item consists of two types of inflows to major reservoirs within the Perth region:
The volume of water transferred to urban supply reservoirs from each pumpback reservoir during 2009-10 is given below. Water is collected in pumpback reservoirs on an opportunistic basis and transferred back to the main urban supply reservoirs to settle (i.e. reduce turbidity) and become part of the water supply source for that reservoir.
|
Reservoir |
Volume (ML) |
|---|---|
|
Conjurunup Dam |
3,159 |
|
Kangaroo Gully Diversion |
1,699 |
|
Total pumped-back |
4,858 |
The volume of water transferred to urban supply reservoirs from the water distribution system during 2009-10 is given below. The water transferred from the water distribution system is a combination of surface water, groundwater and desalinated water. These internal water transfers occur to store desalinated water and groundwater produced during winter, and to balance the reservoirs to prevent overflow and enable summer peak supply capacity.
|
Reservoir |
Volume (ML) |
|---|---|
|
Canning |
9,233 |
|
Lower Helena |
17,659 |
|
Serpentine Pipehead |
5,728 |
|
Victoria(1) |
1,417 |
|
Wungong Dam |
6,338 |
|
Total transferred from IWSS |
40,375 |
IWSS = Integrated Water Supply Scheme
(1) Water transfer to Victoria Reservoir is via Bickley Pumpback Reservoir
Water Corporation: Operational Data Storage System database.
Water Corporation.
There were two other water transfers into surface water reservoirs within the Perth region during 2009-10. In both cases, the total volume of water transferred is based on measured inflow data at the major reservoirs.
Expected error for water meters is +/- 5%.
The Department of Water requires that all water meters, when tested in situ conditions, must be within 5% accuracy across the full flow rate range (Department of Water 2009).
Nil