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 139

  Subcatchment DA 3: Drainage Area 3
  Hydrograph

  Runoff
  0.75  0.70 cfs
  0.7  extreme_precip_tables_output (29) 24-hr S1 25-yr
  Rainfall=3.85"
  0.65  Runoff Area=0.150 ac
  0.6  Runoff Volume=0.044 af
  Runoff Depth>3.50"
  0.55  Flow Length=75'
  0.5  Slope=0.0100 '/'
  Tc=7.2 min
  0.45  CN=97
  Flow (cfs)

  0.4
  0.35
  0.3

  0.25
  0.2

  0.15
  0.1
  0.05

  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)