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 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 29

  Subcatchment ASP: Area to Southern Property
  Hydrograph

  0.21  Runoff
  0.2
  0.19 cfs
  0.19  extreme_precip_tables_output (29) 24-hr S1 10-yr
  Rainfall=3.14"
  0.18
  Runoff Area=0.170 ac
  0.17
  Runoff Volume=0.019 af
  0.16  Runoff Depth>1.35"
  0.15  Flow Length=135'
  0.14  Slope=0.0138 '/'
  0.13  Tc=25.4 min
  CN=80
  Flow (cfs)

  0.12
  0.11
  0.1
  0.09
  0.08
  0.07
  0.06
  0.05
  0.04
  0.03
  0.02
  0.01
  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)