Abstract
Abstract: A microcomputer‐based geographic information system (GIS) supporting hydrologic simulation is described. The hydrologically‐oriented GIs can automatically provide parameters required for prediction of flood hydroghraphs and physically‐based synthetic flood frequency curves for ungaged watersheds. The hydrologic model uses the Soil Conservation Service (SCS) runoff curve number (CN) method and a synthetic unit hydrograph to represent the physical transformation of rainfall into runoff The standard SCS method was modified to account for randomness of key parameters whose probability distributions can be derived from regional rainfall and runoff data. The GIs, and hydrologic theory and techniques, including the modified SCS method, derivation of a regional dimensionless unit hydrograph, and Monte Carlo simulation procedure, are described. Results of hydrologic analysis and simulation by the system implemented for an area of 11000 km2 in the Alberta foothills are presented.
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