Issue No. 4
The purpose of the NFF mailing list is to provide information on the U.S. Geological Survey (USGS) National Flood Frequency (NFF) program. NFF is a computer application that is used to estimate peak discharges for unregulated streams. Values (discharges) derived by the program often serve as input for other applications (such as hydraulic computer models) that are used to technically support end-products (map revisions) of the National Flood Insurance Program (NFIP).
The USGS developed a computer program titled "National Flood Frequency" or "NFF" that estimates the flood frequency and magnitude for ungaged sites through the application of the appropriate regional regression equations. NFF was released in 1993 and does not incorporate any revisions to regional regression equations that occurred after September 30, 1993. Since 1993 a significant number of the regression equations have been revised. The USGS is in the process of revising the NFF computer program to incorporate the updated regression equations. The revised version of NFF will be released soon.
The regional regression equations are currently being used for National Flood Insurance Program (NFIP) purposes. Therefore, FEMA would like to continue with this listserv and discuss issues of interest in the application of the regional regression equations for NFIP purposes. Upon the release of the revised NFF program, the focus of this listserv will shift to assist users in becoming familiar with the revised NFF program and its application for NFIP purposes.
States for which USGS Regression Equations have been revised are listed in the table below.
STATE | REPORT |
Alabama | WRIR 95-4199 |
Alaska | WRIR 93-4179 |
American Samoa | WRIR 95-4185 |
Arizona | WSP 2433 |
Arkansas | WRIR 95-4224 |
Colorado | WRIR 99-4190 |
Connecticut | CWRB no. 36 |
Delaware | WRIR 95-4153 |
Florida -Suwannee | WRIR 96-4176 |
Georgia Rural/Urban | WRIR 93-4016/WRIR 95-4017 |
Hawaii | WRIR 94-4052 |
Idaho | WRIR 94-4120 |
Illinois | WRIR 87-4207 |
Iowa | WRIR 00-4233 |
Kansas | WRIR 00-4079 |
Kentucky- Jefferson Co. Urban | WRIR 97-4219 |
Louisiana | LDTD, WRTR no. 60 |
Maine | WRIR 99-4008 |
Maryland | WRIR 95-4154 |
Massachusetts | ASCE journal articles |
Minnesota | WRIR 97-4249 |
Missiouri | WRIR 95-4231/86-4322 |
Nebraska | WRIR 99-4032 |
Nevada | WSP 2433 |
New Mexico | WRIR 96-4112 |
North Carolina Rural/Urban | WRIR 99-4114 / 96-4084 |
Oklahoma | WRIR 97-4202 |
Pennsylvania | WRIR 00-4189 |
Puerto Rico | WRIR 99-4142 |
South Carolina | WRIR 91-4157 / dWRIR 92-4040 |
South Dakota | WRIR 98-4055 |
Texas Rural and Urban | WRIR 99-4172/98-4015/96-4307/98-4072/98-4178 |
Utah | WSP 2433 |
Virginia | WRIR 94-4148 |
Washington | WRIR 97-4277 |
West Virginia | WRIR 00-4080 |
States for which Revised USGS Regression Equations are being prepared are listed below.
The USGS has established a NFF Web page at: http://water.usgs.gov/osw/programs/nffp.html that describes the program, provides a list of States with revised equations, and contains links to Web-based versions of some of the reports that contain the revised equations. This web site will be updated with new information as it becomes available. The new version of the NFF software will also be available at this site when it becomes available. Please contact the respective USGS district offices/libraries regarding obtaining reports that are not available on the Web.
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Last Modified: Friday, 22-Jun-2007 11:57:20 EDT