Chamber Model = ADS N-12 15" (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +1.00' x 1.20 sf x 3 rows 18.0" Wide + 10.9" Spacing = 28.9" C-C Row Spacing 2 Chambers/Row x 20.00' Long +1.00' Row Adjustment +1.50' Header x 2 = 44.00' Row Length +8.0" End Stone x 2 = 45.33' Base Length 3 Rows x 18.0" Wide + 10.9" Spacing x 2 + 8.0" Side Stone x 2 = 7.65' Base Width 4.0" Stone Base + 18.0" Chamber Height + 4.0" Stone Cover = 2.17' Field Height 6 Chambers x 24.0 cf +1.00' Row Adjustment x 1.20 sf x 3 Rows + 6.31' Header x 1.20 sf x 2 = 162.8 cf Chamber Storage 6 Chambers x 31.9 cf +1.00' Row Adjustment x 1.60 sf x 3 Rows + 6.31' Header x 1.60 sf x 2 = 216.5 cf Displacement 751.0 cf Field - 216.5 cf Chambers = 534.5 cf Stone x 40.0% Voids = 213.8 cf Stone Storage Chamber Storage + Stone Storage = 376.6 cf = 0.009 af Overall Storage Efficiency = 50.1% Overall System Size = 45.33' x 7.65' x 2.17' 6 Chambers 27.8 cy Field 19.8 cy Stone