UG_210_19_5 - UG 210-19-5 ENG – Esri HEC-GeoHMS 10.5 Extension for ArcGIS 10.5
UG 210-19-5 ENG – Esri HEC-GeoHMS 10.5 Extension for ArcGIS 10.5
User Guide: 210-19-5 Date: March 25, 2019
Subject: ENG – Esri HEC-GeoHMS 10.5 Extension for ArcGIS 10.5

Purpose.  This user guide announces the availability of the Esri Geospatial Hydrologic Modeling Extension (HEC-GeoHMS) 10.5 for ArcGIS 10.5 and explains how to obtain the extension.
Effective Date.  Effective upon receipt.
Background.  The U.S. Army Corps of Engineers (USACE) Hydrologic Engineering Center (HEC) in Davis, CA, developed HEC-GeoHMS as an ArcGIS extension to provide engineers and hydrologists with limited GIS experience a set of procedures, tools, and utilities for preparing GIS data for import into the HEC-Hydrologic Modeling System (HMS) program developed by HEC and generating GIS data from HEC-HMS output.

Esri updated HEC-GeoHMS to work with ArcGIS 10.5. HEC-GeoHMS 10.2 is the last version of HEC-GeoHMS tested, verified, and supported by HEC. USACE did not test and does not support HEC-GeoHMS 10.5. HEC is gradually developing and incorporating necessary GIS capabilities within HEC-HMS, and HEC-GeoHMS will ultimately be phased out entirely. More information on this is available from the USACE webpage at

NRCS users working with HEC-GeoHMS 10.5 reported no problems using it.
Distribution. NRCS tested and on November 20, 2018, CCE certified Esri HEC-GeoHMS 10.5, for limited use deployment to NRCS Information Technology Services (ITS) supported workstations running Windows 10 x64. The project reference number if RFC CRQ3411469.

NRCS users are to obtain Esri HEC-GeoHMS 10.5 through their ITS support managers, who can download and install the extension. NRCS makes no official printing or distribution of user documentation. The user’s manual for HEC-GeoHMS 10.2 can be downloaded from the HEC web site at   Esri does not provide user documentation for HEC-GeoHMS 10.5.

Filing Instructions. Users wishing to retain paper copies of any HEC-GeoHMS documentation should place them in a three-ring binder adjacent to other technical directives.
Contact.  For assistance with HEC-GeoHMS, contact Dan Moore at (503) 414-3054 or or Quan Quan at (301) 504-3952 or at the West National Technology Support Center’s Water Quality and Quantity Technology Development Team.

Contact the National Hydraulic Engineer, Conservation Engineering Division (CED), by telephone at (202) 720-0772, or by writing to CED, 1400 Independence Avenue, SW., Room 6136-S, Washington, DC 20250 with questions regarding this directive.


Acting Deputy Chief for Science and Technology

[UG_210_19_5 - March 2019]