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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 33 Pond CH-1: Chambers - Chamber Wizard Field A Chamber Model = ADS_StormTechMC-3500 d +Cap (ADS StormTech® MC-3500 d rev 03/14 with Cap volume) Effective Size= 70.4"W x 45.0"H => 15.33 sf x 7.17'L = 110.0 cf Overall Size= 77.0"W x 45.0"H x 7.50'L with 0.33' Overlap Cap Storage= 14.9 cf x 2 x 6 rows = 178.8 cf 77.0" Wide + 9.0" Spacing = 86.0" C-C Row Spacing 20 Chambers/Row x 7.17' Long +1.85' Cap Length x 2 = 147.10' Row Length +12.0" End Stone x 2 = 149.10' Base Length 6 Rows x 77.0" Wide + 9.0" Spacing x 5 + 12.0" Side Stone x 2 = 44.25' Base Width 9.0" Stone Base + 45.0" Chamber Height + 12.0" Stone Cover = 5.50' Field Height 120 Chambers x 110.0 cf + 14.9 cf Cap Volume x 2 x 6 Rows = 13,373.0 cf Chamber Storage 36,287.2 cf Field - 13,373.0 cf Chambers = 22,914.2 cf Stone x 40.0% Voids = 9,165.7 cf Stone Storage Chamber Storage + Stone Storage = 22,538.7 cf = 0.517 af Overall Storage Efficiency = 62.1% Overall System Size = 149.10' x 44.25' x 5.50' 120 Chambers 1,344.0 cy Field 848.7 cy Stone Page 500 of 1174