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25-4181 storm calcs - proposed Type II 24-hr 10-Year Rainfall=3.14" Prepared by Carmina Wood Design Printed 2/11/2026 HydroCAD® 10.20-8a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 17 Pond 3P: Underground Detention - Chamber Wizard Field A Chamber Model = ADS_StormTechSC-740 +Cap (ADS StormTech® SC-740 with cap length) Effective Size= 44.6"W x 30.0"H => 6.45 sf x 7.12'L = 45.9 cf Overall Size= 51.0"W x 30.0"H x 7.56'L with 0.44' Overlap 51.0" Wide + 6.0" Spacing = 57.0" C-C Row Spacing 5 Chambers/Row x 7.12' Long +0.81' Cap Length x 2 = 37.22' Row Length +12.0" End Stone x 2 = 39.22' Base Length 13 Rows x 51.0" Wide + 6.0" Spacing x 12 + 12.0" Side Stone x 2 = 63.25' Base Width 6.0" Stone Base + 30.0" Chamber Height + 6.0" Stone Cover = 3.50' Field Height 65 Chambers x 45.9 cf = 2,986.1 cf Chamber Storage 8,681.6 cf Field - 2,986.1 cf Chambers = 5,695.5 cf Stone x 40.0% Voids = 2,278.2 cf Stone Storage Chamber Storage + Stone Storage = 5,264.3 cf = 0.121 af Overall Storage Efficiency = 60.6% Overall System Size = 39.22' x 63.25' x 3.50' 65 Chambers 321.5 cy Field 210.9 cy Stone Page 47 of 65