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When setting up a Orange County Rational Method simulation, data must be entered for each sub-area. ...or click on the '''Compute F_m – GIS''' button to use GIS data.

...:left; line-height: 1.0em"> WMS <span style="color:#777; font-weight:100">(Watershed Modeling System)</span></div> ...or:#000; font-weight:100; float: right; line-height: 1.5em">The All-in-one Watershed Solution</div>

...ighting method allows defining one or more gages for each sub-basin in the watershed model. ...ine gage weights for each sub-basin using the Thiessen polygon method. The data required for the "User Gage Weighting" method are shown below:

...S, functions have been created which will overlay the parameter map on the watershed model and assign the appropriate value to each sub-basin. These functions c ...s''' &ndash; Determines the predominate soil type in each sub-basin of the watershed.

...ow. Additional information (help) about any line selected in the ''TR-55'' data window is displayed in the ''TR-55 help'' window. ...Options''' button allows controlling which information is displayed in the data window when the peak discharge is computed. The primary purpose for includi

:''T_LAG'' = watershed lag time in hours. ...asin Data Equations|Computing Lag Time or Time of Concentration from Basin Data]]

Enter the area of the basin in this edit field. If having delineated a watershed from feature objects, a DEM, or a TIN, the drainage area can be computed an ...ations specified (this option is only available when having computed basin data from either a TIN or a DEM).

The ''HSPF Global Options'' dialog box is used to initialize the HSPF data for every hydrologic unit of the hydrologic tree and to set up parameters f ...ill be initialized. The '''Delete HSPF Data''' button will remove all HSPF data from memory. This may be useful if wanting to start over with HSPF input or

...as (1975) and Garbrecht and Martz (1995) have developed methods to extract watershed geomorphology from DEMs. WMS includes many of these same tools. ...cumulations for DEM points are computed using TOPAZ ('''Compute TOPAZ Flow Data''' command in the ''Drainage'' menu). This program uses an eight-point pour

...drographs for each subarea and mainline or lateral collection point in the watershed. .... The area under the hydrograph represents the total volume of flow from a watershed, a variable which the rational method does not provide.

...ion of shallow concentrated flow. Flow may not always be directly down the watershed slope if tillage runs across the slope. After determining average velocity * [[WMS:Overview of Map Data Equations|Overview of Map Data Equations]]

...|thumb|none|left|550 px|HY8 Modeling Wizard showing the ''Storage Capacity Data'' step.]] The ''Storage Capacity Data'' step is used to define storage capacity data and to route the hydrograph at the outlet through the culvert.

==== Add GIS Data Command ==== ...ser to read many formats of vector and raster GIS data. After reading the data, it can be viewed or converted to a format that can be used for hydrologic

| Watershed Modeling .../22%20WatershedModeling-OCUsingGIS.pdf Orange County Hydrology – Using GIS Data]

...oordinates]] to the coordinate system that will be used in delineating the watershed in. This NSS coverage file can then be used for any watershed within the given state.

...to set several options which affect the duration MODRAT will model and the data it will use for input. This dialog is pictured below. ...L.A. County Soil file (LASOILX.DAT), then add additional soil numbers and data to the end of it, beginning with number 373.

...atershed data management (WDM) file. These files are binary, direct-access data files which can hold several thousand datasets. Thus, management of the int The output data from HSPF are stored in a WDM file. AS in that file are the time series use

...he other models supported by WMS, the Rational Method can be defined for a watershed/catchment developed from feature objects, DEMs, or TINs, or built using the **[[WMS:Travel Times from Basin Data|Compute Tc &ndash; Basin Data]]

| Watershed Modeling .../22%20WatershedModeling-OCUsingGIS.pdf Orange County Hydrology – Using GIS Data]

| Watershed Modeling ....aquaveo.com/65%20WatershedModeling-HMSOnlineData.pdf Using Online Spatial Data to Create an HEC-HMS Model]