United States Department of Transportation
i
Modernize Hydrologic Prediction Processes by Creating Custom Statewide SSURGO Green and Ampt Parameter Database Task 1: Hydrologic Methodology Assessment
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2020-12-01
[PDF-3.46 MB]
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Abstract:This document is intended to function as an example of the use of soils data and methods required to implement the Green and Ampt methodology within the state of Nevada. An example hydrologic watershed model was supplied by Nevada Department of Transportation (NDOT). The hydrologic model used the Natural Resources Conservation Service (NRCS) curve number methodology for estimation of rainfall losses and utilized the United States Army Corps of Engineers (USACE) HEC-1 computer program to conduct the assessment. For the purposes of this assessment, the original HEC-1 model was migrated to the USACE Hydrologic Modeling System (HEC-HMS) (v4.6) software platform using the HEC-1 input text contained in the technical documentation for the original hydrologic study (Kimley Horn and Associates, Inc., 2011). Simple basin area averages were used to incorporate land use and percent effective imperviousness adjustments to Green and Ampt soils parameters. All results contained in this document are based upon HEC-HMS analysis to eliminate any potential influence due to different hydrologic calculation platforms.
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