watershed, watershed protection, watershed management, watershed restoration, watershed pollution software

WMS - watershed, watershed protection, watershed management, watershed restoration, watershed pollution software

Creating Watershed Models Directly

Sometimes the simplest solution to creating a watershed model is to use the GIS data directly to delineate boundaries. In the absence of good elevation data or when data already exists in a GIS, WMS allows you to use these data to set up complete watershed models.

Land Use

Land use layers can be imported and used to map curve numbers, runoff coefficients, or other important hydrologic modeling properties.

Soil

Like land use, soil data are important for defining hydrologic modeling parameters.

Travel Time Computations

WMS includes two different methods for computing travel times such as lag time and time of concentration. With the first method, geometric parameters computed from a TIN or DEM are used in empirical equations developed for either time of concentration or lag time. Each sub-basin can use one equation. Coefficients and parameters used in the equation may be individually edited. All information used in computing the travel time may be saved in a text file or copied to the clipboard for documentation purposes.

Computing Composite Curve Numbers

SCS Composite curve numbers can automatically be computed from land use and soil data. Green & Ampt infiltration parameters and runoff coefficients can also be computed using these same kinds of data sets and tools.

HEC-1

Many of the HEC-1 input parameters (area, curve number, lag time, etc.) can be computed directly from the digital terrain model. WMS includes a complete graphical user interface to view/edit these and all other HEC-1 parameters. Input files are written from WMS and a windows version of HEC-1 is launched to execute the model. After running, resulting hydrographs may be read back in and viewed.

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