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Errors in HEC-HMS


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When running the HEC-HMS, there are warning and errors as follows:

WARNING 20657:  Hyetograph gage "NAKHIEL" for subbasin "691B" contains 596064 missing precipitation values that were set to zero.

WARNING 41784:  Simulation time interval is greater than 0.29 * lag for subbasin "630B"; reduce simulation time interval.
ERROR: 10000  Process could not be completed because of a lack of memory.  Contact HEC for recommendations.


The precipitation values of the Hyetograph gage are as follows:

12/5/2001 1:00:00 AM    0.25
1/3/2002 1:00:00 AM    0.76
1/9/2002 1:00:00 AM    0.51
1/10/2002 1:00:00 AM    4.06
1/28/2002 1:00:00 AM    0.51
2/11/2002 1:00:00 AM    1.02
10/28/2002 1:00:00 AM    2.03
10/30/2002 1:00:00 AM    10.92
10/31/2002 1:00:00 AM    32.0
** up to 2016

The time interval in the job control is 15 min

How to fix these problems

Best regards

Edited by Ayman98
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For WARNING 41784, you can try decreasing the time step. Usually a 30 minute time-step does not return that warning. 

As for the other errors, if you would be able to email Tech Support at support@aquaveo.com and include your project file, it will be much easier for us to find a solution for you.



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The problem is that you need consistent time intervals between your precipitation values.  If there is no precipitation for a certain time interval, enter a value of 0 for the precipitation.  If you try to do too large a time interval between precipitation values, you may also get this error message.  I'd try to keep your precipitation time interval to less than an hour, though a single value for each day might work (I don't know that I've tried it).


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