Water resources - Availability - Western Australia
Basin & Surface Water Management Area: Preston River
Introduction
This section presents information about surface water quantity and sustainability. For simplicity of communication, sustainability measures are based on assessing the level of water use and/or allocation with the quantity of water required to fulfil a sustainable flow regime (environmental water provision) - this has been expressed as a sustainable yield.
Vital statistics:
| Mean Annual Run-Off (Natural) (ML/yr) | 145,000 |
|---|---|
| Mean Annual Outflow (Natural) (ML/yr) | 145,000 |
| In-stream commitment (Total available flow - imported water - sustainable yield) (ML) | 94,820 |
| Sustainable Yield - Developed Yield (ML) | 46370 |
| Divertible Yield (ML/yr) | 65,600 |
| Developed Yield (ML/yr) | 3,810 |
| Sustainable Yeild (ML/yr) | 50,180 |
| Yield, Security of Supply | |
| Supply reliability 98% of months and 95% of years | |
| Current Development Category | LOW DEVELOPMENT |
| Diversion (ML/yr) | 3,043 |
| Total Available Water | 145,000 |
PLEASE NOTE:
Mean Annual Outflow:
Mean Annual Outflow calculated based on historical monthly gauging station data where available (or otherwise correlated data) and accumulated for all major watercourses in the SWMA to represent a total basin outflow. Calculated by Surface Water Hydrology Section, Water & Rivers Commission.
Developed Yield:
Yield estimates based on water balance modelling (1962 to 1994) at specific sites and regional relationships. Key Reference: Bunbury - Mandurah Region Water Resources Review and Development Plan, Water and Rivers Commission, Report No. WRAP 1, October 1996.
Divertible Yield:
SWMA sub areas were defined using catchment boundaries delineated by existing and/or potential dam sites and current WRC self supply management areas. Divertible yields were determined for sub areas based on published estimates in WRC reports and databases including Water Resource Allocation & Planning Series (WRAPS) reports, Surface Water Hydrology Report Series (SWHS) reports, DWAID database, and Review 85. In accumulating sub area data to SWMA scale, sites adopted assumed a development scenario which would maximise yield. As divertible yields for different sites obtained via publications were independent yields, yields were adjusted to reflect the interaction of sites in the assumed development scenario.
How has flow regime changed in Preston River?
There is currently no information on flow regime for Preston River.
Trade and Transfer - a bit of give and take:
Water use efficiency and optimisation strategies within existing infrastructure (eg. water supply efficiency, precision irrigation and scheduling, water recycling, trading and pricing) are part of the modern water resource development planning tool kit.
Recognising that water is a finite resource, the States and Territories have developed water allocation systems where security and reliability are assigned to entitlement, trading is provided so water can be moved to high value uses and the choices of individuals are maximised.
Measurement Stations in Preston River
Summary surface water measurement station statistics
| Name | Stream gauge ID | Mean annual flow (ML/yr) | Mean annual flow (mm) |
|---|---|---|---|
| Stream guage 611004 | 611004 | no data | no data |
| Stream guage 611000 | 611000 | 139,409 | no data |
Modelled unimpaired stream-flow sites in Preston River
Over 300 sites across Australia were modelled to predict the unimpaired (natural) stream-flow. The long time series of stream-flow data are important for both research and management of Australia's hydrological and ecological systems. A simple conceptual daily rainfall-runoff model was used to extend the stream-flow data.
The model estimates stream flow from daily runoff and potential evapotranspiration data. The parameters of the model are first calibrated against the available stream-flow data. The optimised parameter values are then used to estimate monthly stream flow from 1901 - 1998.
For further information please refer to : Project Report - Stream Flow Study
Table: Summary unimpaired stream flow sites statistics:
| Station Name | Mean annual runnoff | Mean annual rainfall (mm) |
|---|---|---|
| THOMSON BROOK AT WOODPERRY HOMESTEAD | 125 | 862 |
Further information
- Western Australia Water Resources Assessment 2000 Technical Report
- report from the study of streamflow data and modelled streamflow
- Link to data available for download on the:
- extension of unimpaired monthly streamflow data and regionalisation of parameter values to estimate streamflow in ungauged catchments (NLWRA 2000)
- Surface Water Management Areas
- Link to the Map Maker to make a map using this information.
Key
Links to an another web site
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