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I'm trying to figure out within the pond storage design in Hydraflow Hydrographs extension what exactly it means by the "voids". If I'm designing a typical detention pond, what void % is typical?
If you fill your pond with large rocks, the voids are what and where the water would be stored.
I used to love PondPack during designs because if my pond failed - I could turn my voids to 125% and my pond would upsize!
Your excavation/pond would normally have a 100% void ratio.