Modernize Hydrologic Prediction Processes by Creating Custom Statewide SSURGO Green and Ampt Parameter Database Task 4: Self-Help Training Documentation
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Modernize Hydrologic Prediction Processes by Creating Custom Statewide SSURGO Green and Ampt Parameter Database Task 4: Self-Help Training Documentation

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English
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  • Corporate Creators:
    JE Fuller Hydrology & Geomorphology, Inc.
  • Corporate Contributors:
    Nevada. Department of Transportation
  • Subject/TRT Terms:
  • Publication/ Report Number:
    674-19-803
  • Resource Type:
    Manual
  • Geographical Coverage:
  • Corporate Publisher:
    Nevada. Dept. of Transportation
  • Abstract:
    This document is intended to function as a Nevada Department of Transportation (NDOT) internal Self help guide for developing a simple hydrologic model using HEC-HMS. The model was developed based on the functions available in HEC-HMS Version 4.6. The example does not explain all the functions within HEC-HMS but makes use of the common functions available within the model software. The example was developed using an example watershed model supplied by NDOT. Within the example, notes are added where the modeling methods deviate from the Original Hydrologic Study and where NDOT specific methods were utilized. The reference Bailey Canyon Hydrologic Study was completed for the Washoe County Regional Transit Commission (RTC) in 2011. The hydrologic analysis consisted of a HEC-1 model with 11 subbasins, 6 routing reaches, 1 flow diversion, and 9 concentration points (Junctions). Rainfall losses were originally calculated using the Natural Resources Conservation Service (NRCS) curve number methodology and utilized soil, vegetation, and land use data. Flows were developed using the unit-hydrograph methodology. The precipitation depth was specified using NOAA Atlas 14 data with a fixed areal reduction of 0.98 of the point rainfall applied to all subbasins. The precipitation hyetograph was specified in the HEC-1 model using a JR record for a balanced storm distribution. The original hydrologic study was updated using the Green and Ampt methods/data processed as part of the overall project. Calculation of Green and Ampt parameters was accomplished using Nevada Department of Transportation (NDOT) Geographic Information System (GIS) data derived from NRCS soils surveys. The project watersheds fall within soil survey areas for Nevada (NV) NV628 And NV772 and data was calculated for the most restrictive layer within the top three inches of the soil column.
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