Abstract
The unit hydrograph method is applied to the analysis of the flood hydrology of the River Ter, a stream draining a clay catchment in Eastern England. Two distinct types of simple flood hydrograph resulting from storm rainfall are identified, one characteristic of winter runoff, and a shorter duration type occurring only during the summer. Most of the major floods result from longer and more complex rain periods producing flood hydrographs which may be interpreted as coalescent or superimposed hydrographs of one of the two simple types. The seasonal variation in simple hydrograph form is interpreted as the result of runoff normally occurring from only part of the catchment during the summer months. This is probably due to areal variations in the nature of seasonal changes in soil moisture conditions and crop cover.
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