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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|380 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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| A user may 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. A user can also 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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| {{WMSMain}}
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| [[Category:NSS|O]]
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| [[Category:External Links]]
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| [[Category:Needs Update]]
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| {{stub}}
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