Southtowns Record

5A.-ENGINEER'S REPORT

Government
Town of Aurora
Board
Town Board
Meeting
Feb 4, 2026
Kind
Other
Topics
Water, sewer and drainage, Zoning and land use, Public safety

Original document

Same meeting

Text · page 144 of 351

Read the whole document on one page (all 351 pages, each with its own heading)

WNY-2500056.00_HydroCAD  extreme_precip_tables_output (29) 24-hr S1 10-yr Rainfall=3.14"
Prepared by Greenman-Pedersen, Inc  Printed 12/18/2025
HydroCAD® 10.20-7a s/n 04560 © 2025 HydroCAD Software Solutions LLC  Page 69

  Summary for Subcatchment ATO: Area to Offsite

Runoff  =  0.20 cfs @ 12.39 hrs, Volume=  0.021 af, Depth> 1.35"
  Routed to Link POST : Post Development

Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs
extreme_precip_tables_output (29) 24-hr S1 10-yr Rainfall=3.14"

  Area (ac)  CN  Description
  0.190  80  >75% Grass cover, Good, HSG D
  0.190  100.00% Pervious Area

  Tc  Length Slope Velocity Capacity Description
  (min)  (feet)  (ft/ft) (ft/sec) (cfs)
  30.0  60 0.0050  0.03  Sheet Flow,
  Woods: Light underbrush n= 0.400 P2= 2.20"

  Subcatchment ATO: Area to Offsite