How to calculate hydraulic length or longest flow path of a basin?

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Ondrej Ulrich

Hello again, Mr. Nazar. I recommend you to use HMS to calculate the longest flow path. In the past, I used the GRASS GIS R.LFP toolset, but with the version of HEC-HMS 4.6, the computation is much simpler. But it requires setting up a digital elevation model in HMS. I am attaching the picture below to see which parameters are automatically computed in the HEC HMS based on the DEM:

Usama Nazar

Ondrej Ulrich thank you for your response again. But which option did you select/click, and is it applicable on HEC HMS 4.7.1

Asif Mehmood Rao

USE HEC-GeoHMS to calculate the longest flow path for the basin. This will help you to resolve the issue. You can do all the pre-processing in HEC-GeoHMS for terrain processing.

Brahim Abdelkebir

The latest versions of the program allow you to dispense with doing that by Hec-Geo-Hms i personally see this as shortening more time for the sumulator and reducing the possibility of making mistakes

Michael D. Bartles

Check out this tutorial and guide for step--by-step instructions on how to estimate longest flow path within HEC-HMS: https://www.hec.usace.army.mil/confluence/display/HMSGUIDES/Computing+Subbasin+and+Reach+Characteristics.

Hey Michael D. Bartles , thank you for your answer but we need to import the Geo-referenced sub-basins, just to view these characteristic of a basin. I am importing the geo-referenced subbasin in HEC HMS 4.7, but suddenly the software crashes and i have to restart it again. I cannot figure it out.

If you can help me with that.

First, please use the latest version of the software, which is version 4.9. We've fixed numerous bugs in between v4.7 and v4.9. You can download this version here: https://www.hec.usace.army.mil/software/hec-hms/downloads.aspx.

Here is a tutorial and guide that describes how to georeference existing subbasin and reach elements: "https://www.hec.usace.army.mil/confluence/display/HMSGUIDES/Geo-Referencing+Existing+Basin+Model+Elements+using+Shapefile+Information".

Let me know if you have any additional questions.