I am new to HEC HMS. and i am thinking to perform rainfall runoff modelling of a basin near my area using HEC HMS. The data i have is rainfall time series data and flow data of my outlet point. I want to estimate the discharge and compare the discharge obtained from the model to that of the real observed data..how can i perform the modelling without using soil data as i dont have any soil data or soil classification data of my region (for SCS CN method)?
Hi Kushal,
I don't think you require soil data for computing discharge in HEC HMS. The following links might be useful for your case:
https://www.hec.usace.army.mil/software/hec-hms/documentation/HEC-HMS_Technical%20Reference%20Manual_(CPD-74B).pdf
https://nepis.epa.gov/Exe/ZyNET.exe/P100D9XD.TXT?ZyActionD=ZyDocument&Client=EPA&Index=2011+Thru+2015&Docs=&Query=&Time=&EndTime=&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDay=&IntQFieldOp=0&ExtQFieldOp=0&XmlQuery=&File=D%3A%5Czyfiles%5CIndex%20Data%5C11thru15%5CTxt%5C00000003%5CP100D9XD.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=1&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=hpfr&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x&ZyPURL
Cheers
Hi, follow this link to get the Soil Data
(http://www.fao.org/geonetwork)
Kushal Pokhrel In my view a runoff model that does not take into account any soil data is not realistic.
You actually do not need a soil map to set a HEC-HMS model or to calibrate it. It is a conceptual model, so lot of things are approximated. Of course you can use soil and land use to get the Curve Number and other related parameters in GeoHMS but during calibration they are likely to change also. So, a better idea is, do a literature search, start with reasonable values of soil related parameters and do the calibration and validation for streamflow simulation.
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