Papers published by the Water Systems Research Group

Abstract

Engineers often intuitively use the recurrence interval of a design storm for runoff recurrence interval. It is suggested that this assumption is not soundly based, as the antecedent moisture content (AMO or catchment wetness has a significant effect on the storm runoff recurrence interval. A method is described for generating flood frequency information for a catenment for a design situation. The technique comprises a combination of deterministic and stochastic components. This involves detcrmirusticaily modelling the response oi the catchment together with the use of a stochastic element to derive the conditional probability vector of the outlet hydrograph peaks. The advantage of die method is that the infiltration is modelled using a range of values diat is described statistically. Introduction The recurrence interval, or the risk of exceedcncc. of storm runoff requires assessment in order to avoid over or undcr-design of drainage facilities. Design flood estimation or.

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