Hydrologic Models Meeting the Minimum Requirement of NFIP

Current Nationally Accepted Hydrologic Models

Hydrologic Models
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Numerical Models No Longer Accepted

Hydrologic Models

**Hydrologic Models: Determination of Flood Hydrographs**
PROGRAM	DEVELOPED BY	AVAILABLE FROM	COMMENTS
Single Event
HEC-1 4.0.1 and up ¹ (May 1991)	U.S. Army Corps of Engineers	Water Resources Support Center ² Corps of Engineers Hydrologic Engineering Center (HEC) 609 Second Street Davis, CA 95616-4687	Flood hydrographs at different locations along streams. Calibration runs preferred to determine model parameters. Public Domain: Yes
HEC-HMS 1.1 and up (Mar 1998)	U.S. Army Corps of Engineers	U.S. Army Corps of Engineers Hydrologic Engineering Center 609 Second Street Davis, CA 95616-4687	The Hydrologic Modeling System provides a variety of options for simulating precipitation-runoff processes. Now includes snowmelt and interior pond capabilities, plus enhanced reservoir options. Calibration runs should be used wherever possible to determine model parameters. Public Domain: Yes
TR-20 Win 1.00 (Jan 2005)	U.S. Department of Agriculture, Natural Resources Conservation Service	U.S. Department of Agriculture, Natural Resources Conservation Service	The TR-20 computer model has been revised and completely rewritten as a Windows based program. It is storm event surface water hydrologic model applied at a watershed scale that can generate, route, and combine hydrographs at points within a watershed. Calibration runs preferred to determine model parameters. Public Domain: Yes
WinTR-55 1.0.08 (Jan 2005 )	U.S. Department of Agriculture, Natural Resources Conservation Service	U.S. Department of Agriculture, Natural Resources Conservation Service	The new WinTR-55 uses the WinTR-20 program as the driving engine for analysis of the hydrology of the small watershed system being studied. Public Domain: Yes
SWMM 5 Version 5.0.005 (May 2005) and up	U.S. Environmental Protection Agency	Water Supply and Water Resources Division U.S. Environmental Protection Agency	SWMM 5 provides an integrated environment for editing study area input data, running hydrologic simulations, and viewing the results in a variety of formats. These include color-coded drainage area and conveyance system maps, time series graphs and tables, profile plots, and statistical frequency analyses. Calibration or verification to the actual flood events highly recommended. Public Domain: Yes
MIKE 11 UHM (2002 D, 2004)	DHI Water and Environment	DHI, Inc. 319 SW Washington St. Suite 614 Portland, OR 97204	Simulates flood hydrographs at different locations along streams using unit hydrograph techniques. Three methods are available for calculating infiltration losses and three methods for converting rainfall excess to runoff, including SCS Unit hydrograph method. Calibration or verification to the actual flood events highly recommended. Public Domain: No
PondPack v.8 (May 2002) and up	Bentley Systems	Bentley Systems 685 Stockton Drive Exton, PA 19341	The program is for analyzing watershed networks and aiding in sizing detention or retention ponds. Only the NRCS Unit Hydrograph method and NRCS Tc calculation formulas are acceptable. Other hydrograph generation methods or Tc formulas approved by State agencies in charge of flood control or floodplain management are acceptable for use within the subject State. Calibration or verification to the actual flood events highly recommended. Public Domain: No
XP-SWMM 8.52 and up	XP-Software	XP-Software 700 NE Multnomah St. Suite 230 Portland, OR 97232	Model must be calibrated to observed flows, or discharge per unit area must be shown to be reasonable in comparison to nearby gage data, regression equations, or other accepted standards for 1% annual chance events. Calibration or verification to the actual flood events highly recommended. Public Domain: No
Xpstorm 10.0 (May 2006)	XP Software	XP Software 700 NE Multnomah St. Suite 230 Portland, OR 97232	Xpstorm has the same stormwater modeling capability as the XP-SWMM program. Calibration or verification to the actual flood events highly recommended.
Continuous Event
HSPF 10.10 and up (Dec 1993)	U.S. Environmental Protection Agency, U.S. Geological Survey	Center for Exposure Assessment Modeling U.S. Environmental Protection Agency Office of Research and Development Environmental Research Laboratory 960 College Station Road Athens, GA 30605-2720	Calibration to actual flood events required. Water Resources Application Software Public Domain: Yes
MIKE 11 RR (2002 D, 2004)	DHI Water and Environment	DHI, Inc. 319 SW Washington St. Suite 614 Portland, OR 97204	The Rainfall-Runoff Module (RR, formerly NAM) is a lumped-parameter hydrologic model capable of continuously accounting for water storage in surface and sub-surface zones. Flood hydrographs are estimated at different locations along streams. Calibration to actual flood events is required. View the MIKE 11 Add-On Modules. Public Domain: No
PRMS Version 2.1 (Jan 1996)	U.S. Geological Survey	U.S. Geological Survey 12201 Sunshine Valley Drive Reston, VA 22092 U.S. Geological Survey P.O. Box 25046, Mail Stop 412 Denver Federal Center Lakewood, CO 80225-0046	PRMS is a modular-designed, deterministic, distributed-parameter modeling system that can be used to estimate flood peaks and volumes for floodplain mapping studies. Calibration to actual flood events required. The program can be implemented within the Modular Modeling System) that facilitates the user interface with PRMS, input and output of data, graphical display of the data, and an interface with GIS. Public Domain: Yes

¹ The enhancement of these programs in editing and graphical presentation can be obtained from several private companies.
² Program is typically distributed by vendors and may not be available through HEC. A list of vendors may be obtained through HEC.

Hydrologic Models Meeting the Minimum Requirement of NFIP

Hydrologic Models

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Nationally Accepted Models

Numerical Models No Longer Accepted