Rainfall Model

[Lee Ruddick]

Hi,

I’m looking to create a 2D precipitation model. I’m interested in surface water flowing into a development boundary, however as all rainfall falling on site will be stored in the local drainage system I do not want to rain on the site area directly.

Is there a way I can efficiently represent this in HEC-RAS? In flood modeller the rainfall area is represented through a shapefile, whilst HEC-RAS appears to only allow rainfall on a 2D perimeter? My initial thoughts were to have a separate 2D perimeter for the site with a 2D connection but that does not seem to work as HEC-RAS does not allow for islands within the 2D perimeter. Any advice would be greatly appreciated! Thanks.

[uke]

You could simply make gridded precipitation that covers only your area of interest (or make gridded precipitation over the whole area and assign value 0 over development boundary) and use that as your precipitation input (unsteady flow data > meteorological data >gridded precipitation).

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