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Development of a revised desktop model for the determination of the ecological reserve for rivers
Expanded Title:The previous version of the Reserve Desktop model was based on hydrology and regional parameters, which were largely based on seasonal distributions of stream flow. A recent development in EWR methodology is the flow stressor response method, which links the hydraulic habitat requirements of biota, to the hydraulic characteristics of a channel cross-section, to specify the ecological stress conditions that will occur under different flow regimes. Components of the model deal with hydrology, hydraulics and ecological requirements. The hydraulic sub-model uses a desktop approach to define the characteristics of a representative channel cross-section in the absence of detailed field surveys. The ecological requirements of fish are based on the Velocity Depth Guild (VDG), an approach developed to interpret ecological consequences from generic information on the stream width. The RDRM has been compared to the Intermediate and Comprehensive Reserve Determinations and has reached a Beta version where it can be used with caution. A draft user manual is included which will be revised once the method has been more widely tested. One situation not catered for, is when the present day flows (in one or both seasons) are greater than natural flows.
Date Published:01/03/2012
Document Type:Research Report
Document Subjects:Water Resource Management/IWRM - Catchment Management, Water Resource Management/IWRM - Hydrogeology
Document Keywords:Hydrology
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1856/1/12
ISBN No:978-1-4312-0234-8
Authors:Hughes DA; Louw D; Desai AY; Birkhead AL
Project No:K5/1856
Originator:WRC
Organizations:Institute for Water Research, Rhodes University; IWR Water Resources Pty (Ltd), Pretoria; Streamflow Solutions cc; Rivers for Africa eFlows Consulting (Pty) Ltd, Pretoria.
Document Size:9 635 KB
Attachments:SA Fish flow guildsVer.3.xlsx
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