Water resources - Availability - Tasmania
Basin & Surface Water Management Area: Pieman 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) | 1,898,317 |
|---|---|
| Mean Annual Outflow (Natural) (ML/yr) | 1,898,317 |
| In-stream commitment (Total available flow - imported water - sustainable yield) (ML) | no data |
| Sustainable Yield - Developed Yield (ML) | |
| Divertible Yield (ML/yr) | 1,130,000 |
| Developed Yield (ML/yr) | 8,190 |
| Sustainable Yeild (ML/yr) | no data |
| Yield, Security of Supply | |
| Current Development Category | HIGH DEVELOPMENT |
| Diversion (ML/yr) | 8,190 |
| Total Available Water | 2,098,337 |
PLEASE NOTE:
Mean Annual Flow:
HEC yields for Reece Dam.
Mean Annual Outflow:
Long term average Lake Pieman yield was calculated as a yearly volume.
Developed Yield:
Most water used in the SWMA is for hydro electric power generation. Information on the yield of the system is not available.
Other than power generation, the only other water use is for mining and town water supply. Information on usage is poor. For the purposes of the Audit usage for these purposes was assumed to be the same same as the storage capacity for the pump stations for Pasminco and the diversions for town water supply to Rosebury. Although these etimates are very approximate, they are not considered significant in relation to the water resource available in the SWMA.
Divertible Yield:
Divertable yield was taken from Review 85. Methods and assumptions used cannot be found and hence description cannot be made.
Divertable yield was taken from Review 85. Methods and assumptions used in arriving at these estimates cannot be found and hence further comments cannot be made.
How has flow regime changed in Pieman River?
Change in Flow Regimes:
Significant changes in catchment hydrology due to storage construction and power station operations.
Storage construction; Mackintosh Dam Aug 1980, Murchison Dam Aug 1982, Bastyan Dam July 1983, Reece Dam April 1986.
Other changes; headwater diversion of the Henty River catchment into Pieman River from early 1990s. Mackintosh Power Station Feb 1982, Bastyan Power Station Sept 1983, Reece Dam spillway May 1986, Reece Power Station first release and commercial operation June 1986.
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 Pieman River
Summary surface water measurement station statistics
There were no surface water measurement station statistics reported in this area as part of the assessment
Modelled unimpaired stream-flow sites in Pieman 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
There are no stream flow sites for this region.
Further information
- Tasmania 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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