A Model choice depends on many factors. For watershed modeling, SWAT, HSPF, HEC-HMS, or similar models are used. HEC-RAS, Qual2E are some models used in river systems. It will be helpful to explore more specific need of your research to identify the best model.
Dear, Mr. Randhir is right... if you are a beginner in this field then you may explore the Tool of ARCGIS i.e. Hydrology that will be helpful to watershed delineation and study of morphometry of a river
Dear Javed,
HYSIM is a hydrological simulation model (rainfall-runoff model) which uses rainfall and potential evaporation data to simulate the hydrological cycle (surface runoff, percolation to groundwater and river flow) on a continuous basis.
HYSIM’s parameters define in a realistic way the hydrology and hydraulics of the whole river basin (watershed). Such a model is likely to perform well in climatic conditions more extreme than those in its calibration period.
HYSIM can use data on rainfall, potential evaporation (PET), snow melt and abstractions from, or discharges to, both groundwater and surface water. Only rainfall and PET are essential. The data can be daily or any time step less than a day. The simulation time step can be daily or less than a day.
Not only is HYSIM flexible in its data requirements, it is also flexible in terms of sub-catchments and the reaches for flow routing can be either channels or reservoirs. Flow routing uses the kinematic method. Typical uses of HYSIM have included:
-Using long-term rainfall and PET data to produce long-term flow records
-Flow naturalisation
-Studying the effects of climate change
-Flood studies
-Effects of improved drainage
-Groundwater recharge
http://www.watres.com/software/HYSIM/
The Watershed Modeling System (WMS) is a comprehensive graphical modeling environment for all phases of watershed hydrology and hydraulics. WMS includes powerful tools to automate modeling processes such as automated basin delineation, geometric parameter calculations, GIS overlay computations (CN, rainfall depth, roughness coefficients, etc.), cross-section extraction from terrain data, and many more! With the release of WMS 7, the software now supports hydrologic modeling with HEC-1 (HEC-HMS), TR-20, TR-55, Rational Method, NFF, MODRAT, and HSPF. Hydraulic models supported include HEC-RAS and CE QUAL W2. 2D integrated hydrology (including channel hydraulics and groundwater interaction) can now be modeled with GSSHA. All of this in a GIS-based data processing framework will make the task of watershed modeling and mapping easier than ever before.
http://www.scisoftware.com/products/wms_overview/wms_overview.html
With my best regards
Prof. Bachir ACHOUR
Dear Javed Ali,
The best model choice depends on the conditions of watershed and other factors, if you have a data for any watershed you can make a calibration for this model, I suggest you apply MIKE SHE for hydrologic modeling
best wishes
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