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/usr/share/ElmerGUI/edf-extra/richards.xml is in elmer-common 6.1.0.svn.5396.dfsg-2ubuntu1.

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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE edf>
<edf version="1.0" >
   <PDE Name="Richards Equation" >
      <Name>Richards Equation</Name>

      <Solver>
         <Parameter Widget="Edit" >
            <Name > Procedure </Name>
            <DefaultValue> "RichardsSolver" "RichardsSolver" </DefaultValue>
         </Parameter>
         <Parameter Widget="Edit" Enabled="False">
           <Name> Variable </Name>
           <DefaultValue> Total Head </DefaultValue>
         </Parameter>
 
         <Parameter Widget="CheckBox">
           <Name> Saturated Initial Guess </Name>
           <Whatis> If checked use fully saturated flow parameters for the first iteration. </Whatis>
         </Parameter>
         <Parameter Widget="Edit">
           <Name> Active Coordinate </Name>
           <Whatis> The depth coordinate aligned with the gravity vector. </Whatis>
         </Parameter>

       </Solver>

      <InitialCondition>
         <Parameter Widget="Label" > <Name> Variables </Name> </Parameter>
          <Parameter  Widget="Edit">
           <Name> Total Head  </Name>
         </Parameter>
      </InitialCondition>

      <BodyForce>
         <Parameter Widget="Label" > <Name> Source terms</Name> </Parameter>
         <Parameter  Widget="Edit">
           <Name> Richards Source </Name>
           <Whatis> Source term in the Richards equation. </Whatis>
         </Parameter>

         <Parameter Widget="Label" > <Name> Bodywise Dirichlet Conditions</Name> </Parameter>
         <Parameter  Widget="Edit">
           <Name> Total Head  </Name>
           <Activate> /Richards Equation/BodyForce/Total Head Condition </Activate>
         </Parameter>

         <Parameter  Widget="Edit" Enabled="False">
           <Name> Total Head Condition </Name>
         </Parameter>
      </BodyForce>

      <Material>
        <Parameter Widget="Label" > <Name> Material properties </Name> </Parameter>

         <Parameter Widget="Combo">
            <Name>Porosity Model</Name>
            <Type>String </Type>
            <Whatis> The porosity models for the medium. </Whatis>
            <Item> <Name> van Genuchten </Name> 
              <Activate> /Richards Equation/Material/Saturated Hydraulic Conductivity</Activate>
              <Activate> /Richards Equation/Material/Saturated Water Content</Activate>
              <Activate> /Richards Equation/Material/Residual Water Content</Activate>
              <Activate> /Richards Equation/Material/van Genuchten Alpha</Activate>
              <Activate> /Richards Equation/Material/van Genuchten N</Activate>
              <Activate> /Richards Equation/Material/van Genuchten M</Activate>
            </Item>
            <Item> <Name> Default </Name>
              <Activate> /Richards Equation/Material/Hydraulic Conductivity</Activate>
              <Activate> /Richards Equation/Material/Water Content</Activate>
            </Item>
           <DefaultValue> Default </DefaultValue>
          </Parameter>  

         <Parameter Widget="Edit"  Enabled="False" Visible="False">
            <Name> Saturated Hydraulic Conductivity  </Name>
         </Parameter>
         <Parameter Widget="Edit"  Enabled="False" Visible="False">
            <Name> Saturated Water Content </Name>
         </Parameter>
         <Parameter Widget="Edit"  Enabled="False" Visible="False">
            <Name> Residual Water Content </Name>
         </Parameter>
         <Parameter Widget="Edit"  Enabled="False" Visible="False">
            <Name> van Genuchten Alpha </Name>
         </Parameter>
         <Parameter Widget="Edit"  Enabled="False" Visible="False">
            <Name> van Genuchten N </Name>
         </Parameter>
         <Parameter Widget="Edit"  Enabled="False" Visible="False">
            <Name> van Genuchten M </Name>
         </Parameter>

         <Parameter Widget="Edit"  Enabled="False" Visible="False">
            <Name> Hydraulic Conductivity  </Name>
         </Parameter>
         <Parameter Widget="Edit"  Enabled="False" Visible="False">
            <Name> Water Content  </Name>
         </Parameter>
      </Material>


      <InitialCondition>
         <Parameter Widget="Label" > <Name> Variables </Name> </Parameter>
         <Parameter  Widget="Edit">
           <Name> Total Head </Name>
         </Parameter>
      </InitialCondition>

      <BoundaryCondition>
         <Parameter Widget="Label" > <Name> Boundary Conditions </Name> </Parameter>
         <Parameter  Widget="Edit">
           <Name> Total Head  </Name>
           <Activate> /Richards Equation/BoundaryCondition/Total Head Condition </Activate>
         </Parameter>

         <Parameter  Widget="Edit" Enabled="False">
           <Name> Total Head Condition </Name>
           <Whatis> Only apply Dirichlet conditions for total head if this expression obtains a positive value. </Whatis>
           <StatusTip> Give Total head condition value for this boundary. </StatusTip>
         </Parameter>

         <Parameter  Widget="Edit">
           <Name> Richards Flux  </Name>
         </Parameter>

      </BoundaryCondition>
   </PDE>
</edf>