WMS:Quick Tour -National Streamflow Statistics (NSS)

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The National Flood Frequency (NSS) program is a compilation of state-wide regression equations which were compiled as a joint effort by the USGS, FEMA, and FHWA.

The NSS interface in WMS uses the current NSS database provided by the USGS. Most of the equations are a function of basin area, stream length, and other parameters easily computed by WMS.

Users can also build an NSS Region coverage, which enables WMS to automatically select the correct regression equation(s) and compute percentages of any overlapping areas.

National Flood Frequency Regression Method.jpg NFF 2.jpg


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WMS – Quick Tour
Overview:Getting Started   •   Layout   •   Modules   •   Tools   •   Macros   •   Properties Window   •   Help StripWMS.PNG
Modules:Background Images   •   Draped Images   •   Terrain Data   •   DEMs   •   Flow Direction Vectors  •   Flow Accumalation  •   Watershed Outlet   •   Basin Delineation  •   TINs   •   Conceptual Model   •   Creating the TIN  •   Outlet Point Creation   •   Basin Delineation Flow Paths   •   Coverages  •   Feature Object Data   •   Storing the DEM Delineation   •   Conceptual Model for TINs   •   Creating Watershed Models Directly   •   Land Use   •   Soil   •   GIS Data   •   GIS with ArcObjects   •   Adding GIS Data   •   Join Tables   •   Travel Time Computations   •   More Travel Time Computations   •   Channel Calculations   •   Cutting Cross Sections   •   Curb and Gutter Flow   •   Culvert Hydraulics
Models:HEC-1   •   HEC-1 Lag Time and TC  •   HEC-1 Curve Numbers  •   HEC-1 Thiessen Gage Weights  •   HEC-1 Storage Capacity Curves  •   HEC-1 Time Area Curves   •   HEC-1 Area Between Contours   •   TR-20   •   TR-20 Lag Time   •   TR-20 Curve Numbers   •   Rational   •   Ration IDF Curve   •   NSS   •   HSPF   •   More HSPF   •   LA County Hydrology   •   Maricopa County Hydrology   •   HEC-RAS   •   Storm Drain   •   Further Storm Drain
Functionalities:Floodplain Delineation   •   More Floodplain Delineation   •   Additional Floodplain Delineation   •   Detention Basin Analysis   •   Composite Curve Numbers   •   Post Processing   •   More Post Processing   •   Finding Data   •   Support
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