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 133

  Subcatchment DA 1: Drainage Area 1
  Hydrograph

  Runoff
  0.38  0.35 cfs
  0.36
  extreme_precip_tables_output (29) 24-hr S1 25-yr
  0.34  Rainfall=3.85"
  0.32  Runoff Area=0.060 ac
  0.3  Runoff Volume=0.018 af
  Runoff Depth>3.62"
  0.28
  Flow Length=80'
  0.26  Slope=0.0100 '/'
  0.24  Tc=1.6 min
  CN=98
  Flow (cfs)

  0.22
  0.2
  0.18
  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)