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

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WNY-2500056.00_HydroCAD  extreme_precip_tables_output (29) 24-hr S1 25-yr Rainfall=3.85"
Prepared by Greenman-Pedersen, Inc  Printed 12/18/2025
HydroCAD® 10.20-7a s/n 04560 © 2025 HydroCAD Software Solutions LLC  Page 130

  Subcatchment ATO: Area to Offsite
  Hydrograph

  Runoff
  0.3  0.28 cfs
  0.28  extreme_precip_tables_output (29) 24-hr S1 25-yr
  Rainfall=3.85"
  0.26  Runoff Area=0.190 ac
  Runoff Volume=0.030 af
  0.24
  Runoff Depth>1.91"
  0.22  Flow Length=60'
  Slope=0.0050 '/'
  0.2
  Tc=30.0 min
  0.18  CN=80
  Flow (cfs)

  0.16
  0.14
  0.12
  0.1

  0.08
  0.06
  0.04
  0.02

  0
  0  1  2  3  4  5  6  7  8  9  10  11 12 13 14  15  16  17  18  19  20  21  22  23  24
  Time (hours)