TR20 VS HEC HMS
TR20 VS HEC HMS
(OP)
I noticed at least a 20% difference in flows computed using HEC HMS to TR 55 and TR 20 using the SCS method.
Has anyone else had this problem and if so were you able to get the models calibrated more closely?
Thanks
Al
Has anyone else had this problem and if so were you able to get the models calibrated more closely?
Thanks
Al





RE: TR20 VS HEC HMS
RE: TR20 VS HEC HMS
good luck
RE: TR20 VS HEC HMS
Are you using the same SCS loss, SCS unit hydrograph, and the same SCS storm? I haven't seen a problem running the same inputs in TR20 or HMS. What are your inputs?
20% sounds okay for different hydrologists who are making their own assumptions. I am a little concerned though that using 2 computer programs for the same methodology and procedures (I assume same model parameters) would give such a different answer.