WMS:Texas Department of Transportation: Difference between revisions
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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: | 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: | ||
#Drainage Area: Computed by WMS | #Drainage Area: Computed by WMS | ||
#Main Channel Slope: Computed by WMS, currently needs to be transferred manually from basin data parameters to NSS window. | #Main Channel Slope: Computed by WMS, currently needs to be transferred manually from basin data parameters to NSS window. The parameter computed by WMS that corresponds to the Main Channel Slope required by the regression equation is called "Maximum Flow Slope" | ||
#Mean Annual Precipitation: Derived from a map located at the [http://tg-twdb-gemss.s3.amazonaws.com/d/hydro/tx_precip.zip TNRIS website]. You can also download the shapefiles directly from [http://tg-twdb-gemss.s3.amazonaws.com/d/hydro/tx_precip.zip here]. A mean annual rainfall grid for the state of Texas has been developed from this map and can be loaded directly into WMS. | #Mean Annual Precipitation: Derived from a map located at the [http://tg-twdb-gemss.s3.amazonaws.com/d/hydro/tx_precip.zip TNRIS website]. You can also download the shapefiles directly from [http://tg-twdb-gemss.s3.amazonaws.com/d/hydro/tx_precip.zip here]. A mean annual rainfall grid for the state of Texas has been developed from this map and can be loaded directly into WMS. | ||
#* [ftp://pubftp.aquaveo.com/download/WMSTXDOT.zip UTM Zone 14 file] (the file is called meannual.asc and can be opened in WMS by selecting the Terrain Data Module to make it active, and selecting clicking File | Open and changing the file type to "Rainfall Depth Grid (*.*)") | #* [ftp://pubftp.aquaveo.com/download/WMSTXDOT.zip UTM Zone 14 file] (the file is called meannual.asc and can be opened in WMS by selecting the Terrain Data Module to make it active, and selecting clicking File | Open and changing the file type to "Rainfall Depth Grid (*.*)") | ||
Revision as of 14:20, 22 August 2013
WMS Modeling Tips for Texas Department of Transportation
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:
- Drainage Area: Computed by WMS
- Main Channel Slope: Computed by WMS, currently needs to be transferred manually from basin data parameters to NSS window. The parameter computed by WMS that corresponds to the Main Channel Slope required by the regression equation is called "Maximum Flow Slope"
- Mean Annual Precipitation: Derived from a map located at the TNRIS website. You can also download the shapefiles directly from here. A mean annual rainfall grid for the state of Texas has been developed from this map and can be loaded directly into WMS.
- UTM Zone 14 file (the file is called meannual.asc and can be opened in WMS by selecting the Terrain Data Module to make it active, and selecting clicking File | Open and changing the file type to "Rainfall Depth Grid (*.*)")
- UTM Zone 15 file (the file is called meanannual15.asc and can be opened in WMS by selecting the Terrain Data Module to make it active, and selecting clicking File | Open and changing the file type to "Rainfall Depth Grid (*.*)")
- OmegaEM residual from 2009 5087: Derived from a map located in this report. A link to the report is also contained on the USGS Documentation Site for NSS. The map in this report has been saved as an image file and georeferenced so it can be opened directly in WMS.
- UTM Zone 14 file (the files are called OmegaEM.jpg and OmegaEM.jgw and can be opened in WMS using File | Open and opening OmegaEM.jpg)
- UTM Zone 15 file (the files are called OmegaEM.jpg and OmegaEM.jgw and can be opened in WMS using File | Open and opening OmegaEM.jpg)
TR-55
The TR-55 method uses a Curve Number to determine watershed losses. A sample curve number table for use with WMS is located at the Compute GIS Curve Number page in the "NRCS Curve Numbers (CN)" section. The sample curve number table for vector land use data can also be downloaded here. The sample curve number table for gridded 2006 NLCD land use data can be downloaded here.
