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

Text · page 743 of 1174

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24-4113 WEST SENECA EXCAHNGE NY-WestSeneca_NOAA14 24-hr S1 1-yr Rainfall=1.87"
Prepared by Carmina Wood Design  Printed 7/13/2026
HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC  Page 8

  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=1.20"
  Flow Length=1,050' Tc=4.8 min CN=93 Runoff=40.40 cfs 1.915 af

Subcatchment 6S: DA Uncontrolled  Runoff Area=11.340 ac 86.77% Impervious Runoff Depth=1.45"
  Flow Length=850' Tc=6.0 min CN=96 Runoff=26.40 cfs 1.369 af

Subcatchment 12S: Slade Ave  Runoff Area=0.450 ac 100.00% Impervious Runoff Depth=1.65"
  Flow Length=90' Tc=0.9 min CN=98 Runoff=1.33 cfs 0.062 af

Subcatchment 13S: Slade Ave  Runoff Area=0.450 ac 100.00% Impervious Runoff Depth=1.65"
  Flow Length=90' Tc=0.9 min CN=98 Runoff=1.33 cfs 0.062 af

Subcatchment 14S: Proposed - East  Runoff Area=6.760 ac 97.78% Impervious Runoff Depth=1.65"
  Flow Length=890' Tc=4.8 min CN=98 Runoff=18.18 cfs 0.927 af

Subcatchment 15S: PDA-3  Runoff Area=11,375 sf 36.48% Impervious Runoff Depth=0.81"
  Tc=5.0 min CN=87 Runoff=0.36 cfs 0.018 af

Pond 16P: OUTLET PIPE  Peak Elev=605.42' Inflow=38.71 cfs 6.652 af
  58.0" x 94.0" Box Culvert n=0.013 L=641.0' S=0.0034 '/' Outflow=38.71 cfs 6.652 af

Pond 18P: POND  Peak Elev=609.62' Storage=99,248 cf Inflow=106.67 cfs 5.283 af
  Primary=20.20 cfs 5.283 af Secondary=0.00 cfs 0.000 af Outflow=20.20 cfs 5.283 af

1-yr
LinkPrimary Outflow Imported from COSTCO HYDROCAD 2026-04-13~Link 16L.hce Inflow=46.67 cfs 2.301 af
  Area= 924,495 sf 78.41% Imperv. Primary=46.67 cfs 2.301 af

Link 13L: TOTAL  Inflow=38.71 cfs 6.652 af
  Primary=38.71 cfs 6.652 af

  Total Runoff Area = 38.471 ac Runoff Volume = 4.352 af Average Runoff Depth = 1.36"
  17.87% Pervious = 6.876 ac 82.13% Impervious = 31.595 ac

  Page 743 of 1174