HEC-1, error help

[jbrown1981]

I am attempting to verify a design report done by another Engineering firm, which used HMR51 and HEC-1 to calculate the PMS and PMF for a class C dam. We have the output data from HMR51 and HEC1. When I enter in the storm data into HEC-1, I get an erro that states "specified start and end dates result in too many time periods. This is the input line I believe I need to revise:

IT 15 0 0000 288
IN 120

The curious part is this is what was shown in their output data, so I don't understand why I'm getting an error.

Any suggestions would be greatly appreciated. I should also mention that this is my first experience with HEC-1, so I am still in the learning phase.

 

[gbam]

Its been a while since I used HEC-1. I remember that there was an extended or expanded version for HEC-1 if your hydrograph points exceeded the maximum allowable; you may want to check that out.