Sediment Basin / Trap Storage Volume
Settling storage a construction general permit requires per disturbed acre.
Example
You enter
- Disturbed drainage area (acres) 5
- Required storage per acre (cf/acre) 3600
- Usable settling depth (ft) 3
You get
- Required storage 18000
- Required (cy) 666.667
- Pond footprint at depth 6000 sf
Details, formula, and sources
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.
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.
The per-acre storage rule is set by the construction general permit or AHJ and entered here (no copyrighted table reproduced).
Estimate. AHJ and licensed professional govern.
Field names used by the API: disturbed_ac, storage_rule_cf_per_ac, basin_depth_ft, required_cf, required_cy, surface_area_sf
- Per-acre storage ~3,600 cf/acre wet storage default (doubled for wet+dry); the general permit / AHJ governsconstruction general permit / AHJ
- Scope settling storage only; spillways, dewatering device, and emergency spillway designed separatelysediment-basin design practice