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ENGINEERING.ARCHITECTURE.ENVIRONMENTAL.PLANNING 300 State Street, Suite 201 ● Rochester, NY 14614 Phone 585.454.6110 ● Fax 585.454.3066 www.labellapc.com Project: West Seneca Apartments Project No.: 2241067 Subject Pipe Sizing Calculations Calc By: JB Date: 6/15/2026 Catchment # Total (Acre) Weighted Value Pervious (SF) Impervious (SF) COLUMN C COLUMN D COLUMN E 1 ST-3.4 816.00 8,177.00 0.21 0.84 2 ST-3.3 300.00 4,946.00 0.12 0.86 3 ST-3.2 3,905.00 12,827.00 0.38 0.74 4.1 CHAM 0.00 7,189.00 0.17 0.90 5 ST-3.1 1,198.00 17,386.00 0.43 0.85 6 ST-2.1 760.00 15,654.00 0.38 0.87 7 ST-2.2 548.00 6,725.00 0.17 0.85 8 ST-6.1 41,805.00 0.00 0.96 0.20 4.2 ST-3.0 0.00 7,189.00 0.17 0.90 4.3 ST-3.3 0.00 4,388.00 0.10 0.90 4.4 ST-3.4 0.00 6,627.00 0.15 0.90 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! 0.00 #DIV/0! Totals for System 48516 SF 82931 SF Catchment 3.02 Acres 1.11 Acres 1.9 Acres Page 661 of 1174