Settling chamber surface area Settling chamber surface area

Settling chamber surface area for sand filters and perimeter sand filters.
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Sand Filter		Maximum Ponding Depth (feet)
		< 4	4 to 10
Impervious	≥ 75%	(0.25 Vwq) / Dmax	(0.25 Vwq) / Dmax
	< 75%	(0.25 Vwq) / Dmax	0.066 Vwq
Perimeter Sand Filter		Maximum Ponding Depth (feet)
		<7.5	8 to 10
Impervious	≥ 75%	(0.5 Vwq) / Dmax	(0.5 Vwq) / Dmax
	< 75%	(0.25 Vwq) / Dmax	0.066 Vwq