The following is one of over 75 programs & documentation included with Hydro-CD by Dodson

HEC-1: Flood Hydrograph Package

VERSION/DATE: Version 4.1 June 1998



Also See HydroPro for Windows by Dodson (Part of the ProHEC-CD package)


by Hydrologic Engineering Center US Army Corps of Engineer

Also Includes: 

Installation Instructions 

TD-32 Using HEC-1 on a Personal Computer, Dec 91

ADDITIONAL DOCUMENTATION (not included with this CD):

"Hands-On" HEC-1 (Tutorial and Reference Guide) by Dodson & Associates, Inc.Copyright 1987-1995 (see ProHEC-CD for more information)


Minimum 386 PC with an 80387 math coprocessor and 2.5Mb total memory. Minimum of 4.0 Mb disk space. 


The HEC-1 model is designed to simulate the surface runoff response of a river basin to precipitation by representing the basin as an interconnected system of hydrologic and hydraulic components. Each component models an aspect of the precipitation-


A river basin is represented as an interconnected group of subareas. The assumption is made that the hydrologic processes can be represented by model parameters which reflect average conditions within a subarea. If such averages are inappropriate fo

There are several important limitations of the model. Simulations are limited to a single storm due to the fact that provision is not made for soil moisture recovery during periods of no precipitation. The model results are in terms of discharge an


The HEC-1, Flood Hydrograph Package, computer program was originally developed in 1967 by Leo R. Beard and other members of the Hydrologic Engineering Center (HEC) staff. The first version of the HEC-1 package program was published in October 1968.

In 1973, the 1970 version of the program underwent a major revision. The computational methods used by the program remained basically unchanged; however, the input and output formats were almost completely restructured. These changes were made in order to simplify input requirements and to make the program output more meaningful and readable.

In 1981, major revisions were made to the 1973 version of the program. The program input and output formats were completely revised and the computational capabilities of the dam-break (HEC-1DB), project optimization (HEC-1GS) and kinematic wave (HEC-1KW) special versions of HEC-1 were combined in the one program. The new program included the powerful analysis features available in all the previous programs, together with some additional capabilities, in a single easy to use package.

A microcomputer version (PC version) of the HEC-1 program was developed in late 1984. The PC version contained all the hydrologic and hydraulic computation capabilities of the mainframe HEC-1; however, the flood damage and ogee spillway capabilities were not included because of microcomputer memory and compiler limitations at that time.

This, 1990, version of HEC-1 represents improvements and expansions to the hydrologic simulation capabilities together with interfaces to the HEC Data Storage System, DSS. The entire HEC-1 package, including the DSS interface, is available on the PC and HARRIS minicomputers. HEC-1 with the DSS package is not supported on any other computer system. The DSS capability allows storage and retrieval of data from/for other computer programs as well as the creation of report-quality graphics and tables. New hydrologic capabilities include Green and Ampt infiltration, Muskingum-Cunge flood routing, reservoir releases input over time, and improved numerical solution of kinematic wave equations. The Muskingum- Cunge routing may also be used for the collector and main channels in a kinematic wave land surface runoff calculation.

June 1998, Version 4.1 Final Release



2012 - Walter P. Moore & Associates, Inc. - Houston, TX, USA