The present study is focussed on the problem of developing a basin response function with inadequate data. The case of a catchment with some measurements of output and with input data either totally absent or unemployable is specifically taken for the analysis. The method proposed by Delaine (1970) and demonstrated by him for an experimental drainage area of around 50 acres has been suitably extended to natural catchments from 25 mi.2 to 750 mi.2. It is shown that the synthesis is subjected to uncertainties and errors when the method is applied to larger catchments, though reasonably good results are obtained for smaller catchments. The authors suggest an alternate method applicable for all sizes of catchments assuming linearity and time invariance and that the parameters of the model are correlated with the catchment characteristics.

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