Sediment Basin / Trap Storage Volume
Settling storage a construction general permit requires per disturbed acre: required volume = disturbed acres x per-acre rule (commonly ~3,600 cf/acre wet storage), surface = volume / depth. A 5-acre disturbance needs 18,000 cf (667 cy), a 6,000 sf pond at 3 ft. Sizes settling storage only; the spillways are designed separately. Distinct from flood-control detention.
Formula and source
required_cf = disturbed_ac x storage_rule_cf_per_ac; required_cy = required_cf / 27; surface_area_sf = required_cf / basin_depth_ft.
Sediment-basin storage identity by name (per-acre wet-storage rule); first-principles volume arithmetic.
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