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 100-yr Rainfall=5.25"
Prepared by Greenman-Pedersen, Inc  Printed 12/18/2025
HydroCAD® 10.20-7a s/n 04560 © 2025 HydroCAD Software Solutions LLC  Page 56

  Subcatchment AQR: Area to Quaker Road
  Hydrograph

  Runoff
  0.85  0.78 cfs
  0.8  extreme_precip_tables_output (29) 24-hr S1 100-yr
  0.75  Rainfall=5.25"
  Runoff Area=0.130 ac
  0.7
  Runoff Volume=0.049 af
  0.65  Runoff Depth>4.55"
  0.6  Flow Length=79'
  Tc=8.0 min
  0.55  CN=94
  0.5
  Flow (cfs)

  0.45
  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)