The preprograms to the Institute of Hydrology Distributed Model / L.G. Watts.

"The physically-based Institute of Hydrology Distributed Model (IHDM) requires rainfall as input to generate predicted stream hydrographs. The aim of the IHDM preprograms is to estimate net (that is, effective) rainfall as an improvement over using gross rainfall as input to the main IHDM. This report describes these preprograms, together with a number of case studies of forest and grass catchments. These case studies demonstrate first that the preprograms can provide good agreement between modelled and measured net rainfall, thus generating confidence in the predictive qualities of the modelling; second, that due to restricted data availability, daily rather than hourly Automatic Weather Station data may be incorporated; third, that a complex catchment may be simulated by increasing the number of physically-based zones specified, and fourth, that a combined rain and snow model may be used."

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