Land Areas - Volume Functionality

[fcernst]

I can quickly create a detention pond but there are no preliminary design tools to tell me if it has the required volume.

Land Area Asset Card additions:

-Add a total volume property for the brim full volume of depressions, and volume for mounding (Fill).

-Add a an ellipsis button that brings out a Stage-Storage curve for pond (depression), and a Elev-Volume table for mounding (Fill).

-Automatic Volume: Allow the user to enter a desired volume and have the land area raise up or down to attain the volume. Maintain the vertices' relative elevation differences to each other so that the floor grading of the pond remains flowing to the discharge point.