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| [[Image:image84.jpg|thumb|400 px]]
| | #redirect [[WMS:Stochastic_Modeling#Step_2._Develop_a_working_model_in_HEC-RAS]] |
| The [[WMS:Hydraulic Modeling|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.
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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:Area Property Coverage#Material Properties|HEC-RAS Materials]] dialog. This negative number is a key number and should be unique for each stochastic variable created. When running the stochastic simulation WMS will substitute the simulation specific parameter for the defined key. Then setup a stochastic variable for HEC-RAS in the ''Stochastic Run Parameters'' dialog. A key value (matching the key defined in the materials property) starting value, minimum value, maximum value, standard deviation and distribution type.
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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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| [[Category:Hydraulic Modeling]]
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| [[Category:WMS Dialogs]]
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| [[Category:Needs Update]]
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