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| [[File:NSS OverlappingAreas.jpg|thumb|400 px|The ''Regional regression equations'' section of the ''National Flood Frequency Regression Method'' dialog.]]
| | #redirect [[WMS:NSS_Computing_Peak_Discharges#Overlapping_Regions]] |
| [[File:NSS OverlappingRegions.png|thumb|350 px|Example of the ''Compute Overlapping Areas'' dialog.]]
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| Each state is divided up into hydrologically similar regions with separate regression equations. Once the state is selected, the available regions appear in the text window below the name.
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| ===Selecting Overlapping Regions===
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| Select the region(s) the study watershed overlaps by clicking on the region name in the Regional regression equations available text window and then '''Select →''' button. The region named will be moved to the ''Selected Equations'' text window, and any relevant parameters will be added to the values spreadsheet. If a mistake is made the regional equation can be moved back again using the '''← Remove''' button after selecting the ''Selected Equations'' window.
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| The USGS Report has a description and applicable maps for each state. These maps can be used to identify which regions are overlapped by the study watershed. It is also possible to download one of these maps, register the image, and create an [[WMS:NSS Region Coverage|NSS coverage]]. With an NSS coverage, and providing consistent coordinate systems are used, the overlapping regions can be computed automatically. The NSS tutorial demonstrates how to do this for a state.
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| The website for the USGS report and individual state reports/maps can be found at:
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| http://water.usgs.gov/software/NSS/
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| ==Related Topics==
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| * [[WMS:NSS|Overview of NSS]]
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| * [[WMS:NSS Computing Peak Discharges|Defining an NSS Simulation]]
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| * [[WMS:NSS Region Coverage|NSS Region Coverage]]
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