Abstract
A study was conducted to develop an automated procedure to assist in the development of input data sets for the FESHM hydrologic model using the GRASS geo-graphic information system. Shell scripts (executable sequences of commands in the UNIX operating system) were developed to overlay soils and land use maps to generate hydrologic response unit (HRU) maps and to compute the fractional areas of HRUs in overland flow elements. The automated procedure decreased the input data set development time significantly, by approximately 250% (from five to two hours) for a 122 ha (303 ac) watershed. The time savings on larger, more variable watersheds would be even greater. The input data set development procedure provides an efficient manner for considering alternate land use and management scenarios.
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