WMS:NSS Computing Peak Discharges: Difference between revisions
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Setting up the analysis consists of the following steps, all done within the single dialog shown below: | Setting up the analysis consists of the following steps, all done within the single dialog shown below: | ||
#Delineate | #Delineate the watershed and compute the basin [[WMS:NSS Total Basin Area|area]] and other geometric parameters. Enter the value manually if not having delineated from a DEM, drainage coverage, or TIN. | ||
#Select the [[WMS:NSS State|state]] | #Select the [[WMS:NSS State|state]] the watershed is in and [[WMS:NSS Maximum Flood Region|assign the Maximum Flood Region]]. | ||
#[[WMS:NSS Overlapping Regions|Select the region equation]] that the watershed is in and while highlighted from the ''Available Equations'' window choose the '''Select''' button so that it will be listed in the ''Selected Equations'' window. If the watershed overlaps more than one region then select the other regions as well. | #[[WMS:NSS Overlapping Regions|Select the region equation]] that the watershed is in and while highlighted from the ''Available Equations'' window choose the '''Select''' button so that it will be listed in the ''Selected Equations'' window. If the watershed overlaps more than one region then select the other regions as well. | ||
#[[WMS:NSS Assigning Regression Parameters|Variable]] values derived from a DEM or Drainage coverage will automatically be placed in the appropriate edit fields. Other variables not computed will need to be defined. | #[[WMS:NSS Assigning Regression Parameters|Variable]] values derived from a DEM or Drainage coverage will automatically be placed in the appropriate edit fields. Other variables not computed will need to be defined. | ||
Revision as of 16:09, 11 September 2014
File:Image125.jpg
National Flood Frequency Regression Method dialog
Setting up the analysis consists of the following steps, all done within the single dialog shown below:
- Delineate the watershed and compute the basin area and other geometric parameters. Enter the value manually if not having delineated from a DEM, drainage coverage, or TIN.
- Select the state the watershed is in and assign the Maximum Flood Region.
- Select the region equation that the watershed is in and while highlighted from the Available Equations window choose the Select button so that it will be listed in the Selected Equations window. If the watershed overlaps more than one region then select the other regions as well.
- Variable values derived from a DEM or Drainage coverage will automatically be placed in the appropriate edit fields. Other variables not computed will need to be defined.
- Select the Compute Results button to estimate the peak flows for the 2, 5, 10, 25, 50, 100 and 500-year recurrence intervals.
A hydrograph can be estimated by selecting one of the peak flow rows from the Results table and choosing the Compute Hydrograph button.
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