HEC Programs
The US Army Corps of Engineers Hydrologic Engineering Center Programs have become the industry standard for hydrology and hydraulics computation in the United States. HEC-ResSim, HEC-DSSVue, HEC-HMS and HEC-RAS are state-of-the-art Windows applications. HEC-1, -2, -5, -6, UNET and FFA are stand alone DOS applications and come with the Corps' COED editor and its context sensitive popup Help system, available for input descriptions. All programs come with full documentation, in PDF format. In order to get a detailed description of a particular program, browse the list, below, and then click on a program name to go to its detailed description. For information on ordering any of these programs, please see our Order Form.
HEC-SSP / HEC-ResSim / HEC-HMS / HEC-RAS / HEC-DSSVue /
HEC-1 / HEC-2 / HEC-5 / HEC-6 / MLRP / STATS / UNET / FFAor in combination with each other as:
Detailed Descriptions
HEC-HMS: This "next generation" software for precipitation-runoff simulation will supersede the Hydrologic Engineering Center's HEC-1 program. This state-of-the-art Windows based program is on par with the new HEC-RAS program, and is able to swap output files with it, too. HEC-HMS provides a variety of options for simulating precipitation-runoff and routing processes and is comprised of a graphical user interface (GUI), integrated hydrologic analysis components, data storage and management capabilities, and graphics and reporting facilities. The complete HEC-HMS program, with the HEC-GeoHMS add-on and a complete set of printed manuals is only $75. If you are willing to download the program yourself, you don't pay shipping and you are entitled to either a $40 or $50 discount on your HEC-HMS purchase. In addition, all CD versions of HEC-HMS come with a free copy of HEC-1!
For more information, check out our HEC-HMS page.HEC-RAS: The River Analysis System (RAS) is the first of the Hydrologic Engineering Center's Next Generation Software programs. This Windows based water surface profiles program replaces HEC-2, UNET and HEC-6 programs. For graphic output examples and more information on program features, check out our HEC-RAS Page. The complete HEC-RAS program, with the HEC-GeoRAS add-on and all manuals in PDF format is only $35. If you are willing download the program yourself, you don't pay shipping and are entitled to a $10 discount on your HEC-RAS purchase. In addition, the CD version of HEC-RAS comes with a free copy of HEC-2!
See our Order Form for details.HEC-SSP - the U.S. Army Corps of Engineers Statistical Software Package (HEC-SSP). This software allows you to perform statistical analyses of hydrologic data, performing flood flow frequency analysis based on Bulletin 17B, “Guidelines for Determining Flood Flow Frequency” (1982). The goal of HEC-SSP is to ultimately combine all of the statistical analyses capabilities of HEC-FFA, STATS, REGFRQ and MLRP. The current version of HEC-SSP supports performing flood flow frequency analyses based on Bulletin 17B Guidelines. New features and additional capabilities will be added in future releases. See our HEC-SSP page for details.
HEC-ResSim: As HEC’s newest “Next Generation” (NexGen) software package, HEC-ResSim (Reservoir System Simulation) was designed and developed by the Hydrologic Engineering Center for performing reservoir operation modeling at one or more reservoirs for a variety of operational goals and constraints. It is intended to replace the HEC-5 program in meeting the needs of real-time reservoir regulators for a decision support tool, as well as the needs of modelers doing reservoir projects studies. The HEC-ResSim CD contains the program in its entirety, including example watersheds and documentation, as well as the entire HEC-5 program with all of it's documentation. HEC-ResSim plus HEC-5 is available from WRCS for only $35. HEC-ResSim is also available as part of the HEC-Works CD (along with nine other HEC programs) for only $95.
See our HEC-ResSim page for details.HEC-DSSVue: HEC-DSSVue is a graphical user interface program for viewing, editing, and manipulating data in HEC-DSS database files. HEC-DSSVue is a Java-based visual utilities program that allows users to plot, tabulate, edit, and manipulate data in a HEC-DSS database file. The graphics produced by HEC-DSSVue are highly customizable and can be saved in various formats, including “jpeg” and “png” (portable network graphics), or for printing or copying to the clipboard for inclusion in reports. See our HEC-DSSVue page for details.
The HEC-DSS Vue program is not available individually, but is included for FREE on any of the following CDs: WRCS H&H Software Suite, HEC-RAS, HEC-HMS, HEC-Combo Pack, HEC-Stats Pack or HEC-Works .HEC-1: US Army Corps of Engineers Flood Hydrograph Package for rainfall-runoff simulations. This program will produce runoff hydrographs for complex watershed networks using unit hydrograph or kinematic wave methods and incorporating reservoir and channel routing procedures. The program will allow various methods for calculating rainfall hyetographs, basin unit hydrographs and watershed loss rates. This latest version of HEC-1 was developed by the Corps for evaluating extended hydrographs, with up to 2,000 data points. This can be invaluable for modeling storms of more than a few hours duration when small sub-areas, requiring short time steps, are involved. This will be the last release of HEC-1, as HEC-HMS will eventually replace the program. The HEC-1 program, along with complete documentation, is only available as part of the HEC-HMS, HEC-Combo Pack and HEC-Works CDs.
HEC-2: This US Army Corps of Engineers Water Surface Profiles Program has become the standard for FEMA floodplain evaluations and river channel design. The program runs in sub- or super-critical mode and has extensive bridge and culvert modeling capabilities. It will also model lateral weirs, drop structures and floodplain encroachments. The HEC-2 program, along with complete documentation, is only available as part of the HEC-RAS, HEC-Combo Pack and HEC-Works CDs. .
HEC-5: The HEC-5, Simulation of Flood Control and Conservation Systems, program is designed to simulate the sequential operation of a reservoir/channel system with a branched network configuration. Any time interval from one minute to a month can be used and multiple time intervals can be used within a single simulation. Channel routing can be performed by any of seven hydrologic routing techniques. Reservoirs operate to (1) minimize downstream flooding; (2) evacuate flood control storage as quickly as possible; (3) provide for low flow requirements and diversions; and (4) meet hydropower requirements. Hydropower requirements can be defined for individual projects or for a system of projects. Pump-storage operation can also be simulated. Sizing of conservation demands or storage can be automatically performed, using the safe yield concept, and economic computations can be provided for hydropower benefits and flood damage evaluation. The HEC-5 Package of programs provides for the modeling of 20 reservoirs and 40 control points. The HEC-1 program, along with complete documentation, is only available as part of the HEC-ResSim, HEC-Combo Pack and HEC-Works CDs.
HEC-6: For the evaluation of Scour and Deposition in Rivers and Reservoirs, this program is an extension to the HEC-2 channel geometry model, incorporating suspended and bed load sediment data. Sediment gradation and inflow tables are input to the model, as well as long term inflow hydrographs, and output identifies reaches and depths of sedimentation and channel scour. HEC-6 is available on CD, with Users Manual in PDF format for $25, or as a part of the HEC-Works CD.
MLRP: The Multiple Linear Regression program follows the procedures of "Statistical Methods in Hydrology" (Beard, 1962). Major features of the program are automatic deletion of independent variables (according to importance), combination of variables to form new variables, transformation of variables, tabulation of the residuals from the prediction equation and acceptance of input coefficients. The MLRP program, with complete documentation, is only available as part of the HEC-FFA Stats Pack for $35.
STATS: The STATS program is designed to reduce large volumes of time series data to a few meaningful statistics or curves. The program will perform the following analyses: (1) duration curves; (2) annual maximum events; (3) annual minimum events; (4) departures of monthly and annual values from respective means; and (5) annual volume-duration exchange of high and low events. The data to be used as input to this program can be provided from a data file or the data can be accessed through HEC's Data Storage System (HEC-DSS). This latter capability provides for the analysis of output from other HEC programs. The frequency analysis may be analytical for data that tends to follow a theoretical distribution, e.g., annual maximum daily flows; or graphical for those data that do not tend to follow any known distribution, e.g., regulated flows. The input data may be transformed to logarithms for the statistical analyses, if so desired. Program documentation consists of detailed Input Description. The MLRP program, with complete documentation, is only available as part of the HEC-FFA Stats Pack, available from WRCS for only $35.
UNET: This version (4.0) is the latest and last release of this program from the Corps. UNET simulates one-dimensional unsteady flow through a full network of open channels. In addition to solving the network system, UNET provides the user with the ability to apply several external and internal boundary conditions, including: flow and stage hydrographs; rating curves; gated and uncontrolled spillways; pump stations; bridges; culverts; and levee systems. The Program comes with Corps' Data Storage System software and GSS device drivers. This latest version features a new Windows User Interface which can invoke both a new editor and a UNET plotter program. The UNET model is not available directly from the Corps. The program comes with complete documentation on CD for $35.
FFA: The HEC Flood-Flow Frequency Analysis program performs frequency computations of annual maximum flood peaks in accordance with the Water Resources Council "Guidelines for Determining Flood Flow Frequency," Bulletin 17B. This edition replaces the previous HEC-WRC program. Date of Last Program Release: February 1995 (Version 3.1) The program comes with a complete, bound copy of the Users Manual. The Program also comes with Corps' Data Storage System software and GSS device drivers. HEC-FFA is not available directly from the Corps, but is available from WRCS, with complete documentation on CD, as part of the HEC-FFA Stats Pack, which also contains the MLRP and STATS programs, for only $35. FFA is also available as part of the HEC-Works CD.
HEC Combination Pack CDs
HEC-Combo Pack: HEC-HMS, HEC-GeoHMS, HEC-RAS, HEC-GeoRAS, HEC-1, HEC-2 and the HEC-DSS Utilities, all on one CD. Documentation for all programs is also included on the CD in PDF format. HEC-Combo Pack is only available from WRCS and for a price of only $45. This reflects a savings of $25 from the individual program prices!
HEC-Works CD: HEC-HMS, HEC-GeoHMS, HEC-RAS, HEC-GeoRAS, FFA, HEC-ResSim, HEC-1, HEC-2, HEC-5, HEC-6, all of the DSS utilities and drivers, including DSSVue, all on one CD. Documentation for all programs is also included on the CD in PDF format. HEC-Works is only available from WRCS and for a price of only $95. This reflects a considerable savings of $365 from the individual program prices!
HEC Stats Pack: The FFA program comes with the Corps' Data Storage System (DSS) software, including DSSView, MLRP (Multiple Linear Regression Program) and STATS programs. Documentation for all programs is also included on the CD, in PDF format. The MLRP and Stats programs are only available as part of the HEC-FFA Stats Pack. The HEC-Stats Pack is only available from WRCS and for a price of only $35.
