Abstract
Most conventional rainfall-runoff modeling methods are tedious and time-consuming. The Watershed Modeling System (WMS) is a comprehensive computer software application for watershed characterization and rainfall-runoff modeling in a graphical user interface environment. Through several GIS operations and tight integration with GIS databases, WMS enables hydrologists and water resource engineers to perform rainfall-runoff modeling more efficiently than conventional modeling methods. In this paper, methods of computing hydrologic parameters for the Flood Control District of Maricopa County are discussed, and demonstrated by applying them to the Gavilan Peak Watershed. This watershed is located in the vicinity of the community of New River in northern Maricopa County, Arizona.
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