I am creating a detention pond for a site. In order to determine the Water Surface Elevation (WSEL) for the detention pond, I am using the current existing grade on site based on Topo drawings. The existing grade elevation is 36 ft. We will excavate the earth to create the proposed detention pond and size the pond that it should match the existing grade when it is full of water. Please let me know if this accurate? Any suggestions/comments are appreciated.
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