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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.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | ★ Approved revision 17:31, 20 August 2007 | | 376 × 510 (53 KB) | Trabadi (talk | contribs) |
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