Southtowns Record

PB Agenda Packet 8.13.2026

Government
Town of West Seneca
Board
Planning Board
Meeting
Aug 13, 2026, 6:00 p.m.
Posted by publisher
Jul 28, 2026
Kind
Agenda packet
Topics
Water, sewer and drainage, Roads and traffic, Housing, Zoning and land use, Parks and recreation, Budget and taxes, Public safety

Original document

Same meeting

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24-4113 WEST SENECA EXCAHNGENY-WestSeneca_NOAA14 24-hr S1 10-yr Rainfall=3.39"
 Prepared by Carmina Wood Design  Printed 7/13/2026
 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC  Page 22

  Time span=0.00-150.00 hrs, dt=0.01 hrs, 15001 points
  Runoff by SCS TR-20 method, UH=SCS, Weighted-CN
  Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method

 Subcatchment 1S: Proposed - West  Runoff Area=19.210 ac 73.66% Impervious Runoff Depth=2.63"
  Flow Length=1,050' Tc=4.8 min CN=93 Runoff=86.22 cfs 4.208 af

 Subcatchment 6S: DA Uncontrolled  Runoff Area=11.340 ac 86.77% Impervious Runoff Depth=2.94"
  Flow Length=850' Tc=6.0 min CN=96 Runoff=51.57 cfs 2.775 af

 Subcatchment 12S: Slade Ave  Runoff Area=0.450 ac 100.00% Impervious Runoff Depth=3.16"
  Flow Length=90' Tc=0.9 min CN=98 Runoff=2.45 cfs 0.118 af

 Subcatchment 13S: Slade Ave  Runoff Area=0.450 ac 100.00% Impervious Runoff Depth=3.16"
  Flow Length=90' Tc=0.9 min CN=98 Runoff=2.45 cfs 0.118 af

 Subcatchment 14S: Proposed - East  Runoff Area=6.760 ac 97.78% Impervious Runoff Depth=3.16"
  Flow Length=890' Tc=4.8 min CN=98 Runoff=33.74 cfs 1.778 af

 Subcatchment 15S: PDA-3  Runoff Area=11,375 sf 36.48% Impervious Runoff Depth=2.08"
  Tc=5.0 min CN=87 Runoff=0.95 cfs 0.045 af

 Pond 16P: OUTLET PIPE  Peak Elev=606.96' Inflow=87.97 cfs 13.894 af
  58.0" x 94.0" Box Culvert n=0.013 L=641.0' S=0.0034 '/' Outflow=87.97 cfs 13.894 af

 Pond 18P: POND  Peak Elev=610.89' Storage=185,425 cf Inflow=218.75 cfs 11.119 af
  Primary=53.90 cfs 11.119 af Secondary=0.00 cfs 0.000 af Outflow=53.90 cfs 11.119 af

10-yr
 LinkPrimary Outflow Imported from COSTCO HYDROCAD 2026-04-13~Link 16L.hce Inflow=96.07 cfs 4.850 af
  Area= 924,495 sf 78.41% Imperv. Primary=96.07 cfs 4.850 af

 Link 13L: TOTAL  Inflow=87.97 cfs 13.894 af
  Primary=87.97 cfs 13.894 af

  Total Runoff Area = 38.471 ac Runoff Volume = 9.044 af Average Runoff Depth = 2.82"
  17.87% Pervious = 6.876 ac 82.13% Impervious = 31.595 ac

  Page 757 of 1174