WMS:Texas Department of Transportation

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WMS Modeling Tips for Texas Department of Transportation

Methodologies

NSS:

The TXDOT Regression Equation for watersheds in rural areas is listed in the NSS program as "Peak Rural Statewide 2009 5087". The equation requires the following parameters:

  1. Drainage Area: Computed by WMS)
  2. Main Channel Slope: Computed by WMS, currently needs to be transferred manually from basin data parameters to NSS window).
  3. Mean Annual Precipitation: Derived from a map located at the [TNRIS http://tg-twdb-gemss.s3.amazonaws.com/d/hydro/tx_precip.zip] website. You can also download the shapefiles directly from [here http://tg-twdb-gemss.s3.amazonaws.com/d/hydro/tx_precip.zip]
  4. OmegaEM residual from 2009 5087: Derived from a map located in [this http://pubs.usgs.gov/sir/2009/5087/pdf/sir2009-5087.pdf] report
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