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...a resolution of 30-meters for the entire U.S. and some 90-meter world-wide data is also available. [[WMS:Quick Tour - Terrain Data| '''< Previous''']] | [[WMS:Quick Tour - Flow Direction Vectors| ''' Next

[[File:TR-55 Outlets.png|thumb|250 px|The ''TR-55'' dialog showing outlet data]] WMS allows defining the watershed as a single basin or subdivide the watershed into multiple sub-basins. Besides computing peak flows using the standard T

:''C_t'' = coefficient of watershed topography based on impervious area. :''I_a'' = percentage of impervious area in the watershed (must be defined in the HEC-1 Loss methods).

A primary use of WMS is to automatically delineate watershed, stream, and sub-basin boundaries from digital elevation sources such as TI ...thod is simpler and more repeatable because of the uniform nature of a DEM data structure. When inadequate elevation resolution is available (i.e. many urb

...ermits users to take advantage of many of ArcGIS tools as they construct a watershed model, including: ...uick Tour - GIS Data| '''< Previous''']] | [[WMS:Quick Tour - Adding GIS Data without ArcObjects| ''' Next >''']]

:''T_LAG'' = watershed lag time in hours. :''L'' = watershed maximum flow distance length in miles.

...shed model for hydrologic analysis or as a companion in the development of watershed models with TINs and DEMs. ...can be created automatically from points, lines, and polygons. Since these data are often already developed and stored in a GIS, importing from [[WMS:Impor

...t common and simplest methods available for automatically characterizing a watershed. Many raster GIS programs have similar capabilities, but WMS has been desig #Identify the watershed outlet and covert DEM streams to arcs.

...d models. This data is termed "Map data" in WMS. Based on its purpose, Map data is grouped together into Coverages. Some of the most common Coverage types ...ion (Flow Paths)| '''< Previous''']] | [[WMS:Quick Tour - Feature Object Data| ''' Next >''']]

...del'' step is used for defining which model is running with the delineated watershed. ...this button to set the model to the selected option, initialize the model data to default values, and set the module to the correct module.

The core functionality of WMS allows the automated delineation of watershed and sub-basins. Additional tools have been developed as part of the HSPF in ...ons, and a land use layer which contains land-use type polygons or gridded data. The two layers, or coverages, are compared to determine the land-use types

#redirect [[WMS:Project Explorer Contents for Terrain Data Module]] ...the active TIN or DEM is used. When selecting a TIN or a DEM, the Terrain Data module is set as the active module. To perform drainage computations on a

...and ArcView®, there are several possible scenarios for importing and using data developed by GIS applications that support the ArcView® file formats. ...of the key issues involved in importing shapefiles (ARC/INFO® or ArcView® data) and provides examples of common problems.

...al Method &ndash; Edit Parameters'' dialog is displayed and view its reach data. ...gth, up elevation, down elevation, and slope will be computed if using GIS data.

...is that is easy to interact with. There are tools within WMS for using GIS data to automate basin delineation and loss rate computations. Many of the geome * [[WMS:Creating Watershed Models|Creating Watershed Models]]

...ed by WMS]]. This terrain model then serves as a map to guide entry of all data necessary to run HEC-1, TR-20, or other hydrologic analysis programs. * [[WMS:TIN Guidelines|Guidelines for Watershed Delineation with TINs]]

...ark unit hydrograph method, they also defined a relationship for the Clark watershed storage coefficient that is given by the equation following the tc equation :''R'' = Clark watershed storage coefficient.

[[File:MapModuleExample.png|thumb|250 px|Examples of arcs drawn over DEM data in the Map module]] ...module provides a [[WMS:Map Tools|suite of tools]] for defining watershed data using [[WMS:Feature Objects|feature objects]]: points, arcs, and polygons.

...ing travel times for lag time and time of concentration from the geometric data being used for basin delineation and parameter estimation. ...WMS:Delineation with DEMs|data computed by WMS when using a DEM]] or [[WMS:Watershed Delineation with TINs|TIN ]]for basin delineation. Many different equations

...nstruction of topologic watershed models in the absence of digital terrain data.