5179Flood Report_REV_3

ail

Callaghan & Toth

 

1 Pluviographs:

Location. ARR_TEMPORAL_DATA
13 Subareas:

1234567

8 9 10 11 12 13

End of Pluviograph Data.

End of Gauging Station Data.

5. RATIONAL METHOD FLOWS —- POST DEVELOPMENT

ae

 

Catchment Area = 1.80 (Pearsons Rd) + 1.47 (Elm St) = 3.27 Ha
C10 Runoff Coefficients: 0.78 (Pearsons Rd) and 0.79 (Elm St)
Concentration Times:

From Pearsons Rd: 60m sheet flow @ 4% = 13.0 mins
45m driveway @ [email protected] m/sec = 1.5 mins

60m pipe/road @ [email protected] m/sec = 0.4 mins
60 m swale @ 3% = 0.8 mins
Total: 15.7 mins
From Elm St: 8m sheet flow @ 1% = 8.0 mins
60 m swale flow @ 1% = 4.0 mins
80 m pipe/path @ 4% @ 1m/s = 1.3 mins
57 m pipe/road @ [email protected]/s = 0.7 mins
78 m swale/path @ 1m/s = 1.6 mins
60m pipe/road @ [email protected] m/sec = 0.4 mins
60 m swale @ 3% = 0.8 mins

 

2035 2 Pearsons Road — Flood Study — Revision 3 April 2021