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Regional Design Storm and Flood Modelling—Risk Implications in Ungauged Catchments
Department of Geology, University of Botswana, Gaborone, Botswana
Department of Geology, University of Botswana, Gaborone, Botswana
- 1 Department of Geology, University of Botswana, Gaborone, Botswana
- 2 Department of Geology, University of Botswana, Gaborone, Botswana
Journal of Water Resource and Protection·Volume 08 (2016)·Pages 1211–1221·Published 28 November 2016·DOI10.4236/jwarp.2016.813093
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Abstract
Most planned developments in a catchment for control of excess water using a culvert, bridge or dam spillway are located at a site in a stream where there are no discharge measurements. Even though, for gauged catchments a number of established flood frequency models and rainfall-runoff models do exist, for ungauged catchments mostly regional flood frequency and event-based rainfall-runoff models are used, which depend on regional parameters. In this paper, a regional approach for design floods is presented and risk implication for design of drainage structures assessed. A case study in light of the above has been considered at four ungauged sites in the Limpopo Drainage Basin in north-eastern Botswana.
KeywordsUngauged CatchmentsDrainage StructuresDamsDesign FloodRisk Assessment
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