TITLE:
Regional Design Storm and Flood Modelling—Risk Implications in Ungauged Catchments
AUTHORS:
Berhanu F. Alemaw, Ron T. Chaoka
KEYWORDS:
Ungauged Catchments, Drainage Structures, Dams, Design Flood, Risk Assessment
JOURNAL NAME:
Journal of Water Resource and Protection,
Vol.8 No.13,
November
28,
2016
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.