Developing Parameters for a Quasi-Distributed Runoff Model Using GIS

The widespread availability of radar precipitation data is driving rainfall-runoff modeling from lumped-input to distributed-input methods. As a consequence, model parameterization is becoming a very complicated process, which effectively cannot be carried out without the use of computers. The modified Clark ur hydrograph is perhaps the simplest possible distributed-input rainfall-runoff model, but even this simple model requires calculation of hundreds of parameter values to represent a medium-sized watershed.