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| The [[WMS:Hydraulic Modeling Introduction|HEC-RAS interface]] tools in WMS can be used to developing a working HEC-RAS model. It is important that this model be running effectively (i.e. calibrated and/or adjusted to give credible results) prior to using it for the Stochastic Modeling simulation.
| | #redirect [[WMS:Stochastic_Modeling#Step_2._Develop_a_working_model_in_HEC-RAS]] |
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| [[Image:image279.gif]]
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| The only parameter at this point that can be varied within a range of probable answers are Manning's coefficients for the different material types. This is done by setting the roughness to be a negative number in the [[WMS:Material Properties|HEC-RAS Materials]] dialog. This negative number is a key number and should be unique for each stochastic variable you create. When running the stochastic simulation WMS will substitute the simulation specific parameter for the defined key. You can then setup a stochastic variable for HEC-RAS in the ''Stochastic Run Parameters'' dialog. A key value (matching the key you defined in the materials property) starting value, minimum value, maximum value, standard deviation and distribution type.
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| [[Image:image84.jpg]]
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| [[WMS:Hydrologic Model|Previous Step in Stochastic Modeling]]
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| [[WMS:Flood Plain Delineation|Next Step in Stochastic Modeling]]
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| ==Related Topics==
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| *[[WMS:Stochastic Modeling|Stochastic Modeling]]
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| *[[WMS:Overview of Flood Plain Delineation|HEC-RAS Modeling]]
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| {{WMSMain}}
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