South East Queensland

                                                                                                   

14.3 Leakage from connected surface water store

                             

Supporting information   


This line item represents the losses from storages in the South East Queensland (SEQ) region. The table below contains the resource operation plan (ROP) storage loss values and the adjusted storage loss calculated by removing net evaporation. This line item consists of the adjusted storage loss volume.

Southeast Queensland region storage and transmission losses
Water Resource Plan (WRP) area Water Supply Scheme (WSS) Storage Name Net Evaporation (ML)1 Resource Operation Plan (ROP) Storage Loss (ML) Adjusted Storage Loss (ML) ROP Transmission Loss (ML) Total (ML)
Gold Coast Nerang Advancetown Lake (Hinze Dam) 4,724 NA NA NA NA
Little Nerang Dam 73
Total Gold Coast WRP area 4,797 NA NA NA NA
Logan Basin Logan River Bromelton off-stream storage 0 483 483 5,896 6,379
Cedar Grove Weir 0 220 220
Lake Maroon 3,731 1,475 02
None Tingalpa Reservoir (Leslie Harrison Dam) 4,170 NA NA NA NA
Total Logan Basin WRP area 7,901 2,178 483 5,896 6,379
Moreton Central Brisbane and Stanley Mount Crosby Weir 0 NA NA NA NA
Lake Wivenhoe 104,241 137,496 33,255 33,255
Lake Somerset 38,914 67,114 28,200 28,200
Central Lockyer Lake Clarendon 1,719 NA NA NA NA
Lake Dyer (Bill Gunn Dam) 736
Cressbrook Creek Lake Cressbrook 6,027 NA NA NA NA
Lake Perseverance 1,964
Lower Lockyer Lake Atkinson (Atkinson Dam) 5,469 NA NA NA NA
Pine Valley Lake Samsonvale (North Pine Dam) 19,544 NA NA NA NA
Warrill Valley Lake Moogerah 6,864 NA NA NA NA
None Enoggera Reservoir 539 NA NA NA NA
Gold Creek Reservoir 166
Lake Kurwongbah (Sideling Creek Dam) 2,777
Lake Manchester (Cabbage Tree Creek Dam) 2,767
Splityard Creek Dam 1,413
Total Moreton WRP area 193,140 204,610 61,455 NA 61,455
Total SEQ region 205,838 206,788 61,938 5,896 67,834

NA = not available

Table note

  1. Net evaporation was calculated for each storage based on the precipitation on, and evaporation from, each individual storage, as calculated for line items 13.1 Precipitation on connected surface water and 14.1 Evaporation from connected surface water.
  2. Where the net evaporation for an individual storage was calculated to be greater than the ROP storage loss, a storage loss was not recognised for the individual storage.

 

Quantification approach   


Data source

  • Queensland Department of Environment and Resource Management (DERM), transmission and storage losses from DERM Water Entitlement Register Database (WERD), Water Management System database and DERM staff calculations
  • DERM, storage loss factors from Moreton and Logan Basin resource operation plans (ROPs)

 

Data provider

DERM.

 

Method

Leakage from storages were estimated for specific storages and streams only.

Storage loss is the loss in the water supply scheme (WSS) storages. Where storage loss was not specifically evaluated as part of ROP reporting requirements, the storage loss allowance detailed in the ROPs was used as an estimate. This was done by adding the storage loss allowances calculated for each month, based on the storage surface area at the start of month and the application of the difference between monthly storage loss factors in the applicable ROP tables. The Moreton and Logan Basin ROPs provide storage loss tables for Lake Wivenhoe, Lake Somerset and Lake Maroon, Cedar Grove Weir and Bromelton Off-stream Storage.

ROP storage loss factors include a component for net evaporative losses from the storages. Evaporation from storages was included in line item 14.1 Evaporation from connected surface water, and precipitation on storages was included in line item 13.1 Precipitation on connected surface water. To prevent double counting of the net evaporative loss from storages, the evaporative loss calculated by the Bureau of Meteorology was subtracted from the storage loss volumes provided by DERM. Where the net evaporation for an individual storage was calculated to be greater than the ROP storage loss, a storage loss was not recognised for the individual storage.

 

Uncertainty

Derived from storage loss estimates. DERM reliability and accuracy rating is B4 (see glossary).

 

Approximations, assumptions, caveats and limitations

  • It has been assumed that the WERD and WMS database data were current, accurate and correct.
  • Various ROPs list losses from the connected surface water store where the components of the connected surface water store are part of the WSS. Where the connected surface water store is not part of a WSS, losses from the store were not available and could not be quantified accurately.
  • Losses from the connected surface water store that forms part of the WSS have been estimated and reported where information was available to allow accurate quantification. Therefore:
    • transmission losses were not reported in the Moreton or Gold Coast WRP areas
    • storage losses were not reported in the Gold Coast WRP area.