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Abstract
AbstractThe UK Flood Estimation Handbook describes a new approach to flood peak estimation and includes a volume which summarises developments in the rainfall‐runoff method since its publication in the Flood Studies Report in 1975.One of the improvements has been the construction of a new unit hydrograph time‐to‐peak estimation equation. The handbook illustrates how information from digital datasets can be used to compute a number of catchment descriptors which, taking the place of information abstracted manually from Ordnance Survey maps, are introduced as independent variables. The new equation is obtained from an enlarged database consisting of 1822 rainfall‐runoff events which incorporate a greater variety of catchments than were used in the Flood Studies Report.This paper (a) summarises the extent of the research, (b) outlines the steps involved, and (c) recommends an equation for estimating unit hydrograph time‐to‐peak from digital catchment data.
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