HEC-GeoHMS 10.5.0.7 can be downloaded from our software library for free. This download was checked by our antivirus and was rated as malware free. This PC program works fine with 32-bit versions of Windows XP/Vista/7/8/10. The latest installation package takes up 49.5 MB on disk. The program relates to Photo & Graphics Tools. The most popular versions of the program are 10.1, 10.0 and 5.0. This free tool was originally designed by Hydrologic Engineering Center.
From the developer:
HEC-GeoHMS is a free GIS extension that provides the user with a set of procedures, tools, and utilities for the preparation of GIS data for import into HEC-HMS and generation of GIS data from HMS output.
You may want to check out more software, such as Terragen, Poser or TurboCAD Deluxe, which might be similar to HEC-GeoHMS.