Application of a Geographic Information System to Hydrologic Modeling Using HEC-1by Rodney A. Moeller, James M. Montgomery, Consulting Engineers, Inc, Bellevue, United States,
Abstract: A geographic information system (GIS) was used to derive areally-weighted hydrologic parameters for input to the HEC-1 hydrologic model for approximately 600 square miles of Pierce County, Washington. Basin boundaries, land use, and soils layers were geoprocessed to derive basin areas, weighted percent-impervious values and curve numbers. This paper discusses the steps in the geoprocessing workflow. First, data sources and data input are discussed. Next, derivation of areally-weighted hydrologic parameters is discussed. Finally, conclusions are drawn concerning the advantages and disadvantages of using a GIS in hydrologic modeling.
Subject Headings: Geographic information systems | Hydrologic models | Information systems | Hydrology | Parameters (statistics) | Computer models | Layered soils | Basins | Washington | North America | United States
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