Reference Document - RAL23/0013.02 - Part 2 (As Published)

Project Name: 33 Pavilion St
Col Fi sy Project No.: 23-0167
Author: L Gillis
be

Date: 04/10/2023
ARR: ARR2016

RATIONAL METHOD SUMMARY & RAINFALL DATA

10
15
20
25
30
45
60.00
90.00
120.00
180.00
270.00
360.00
540.00
720.00
1080.00
1440.00
1800.00
2160.00
2880.00
4320.00

1 1.0075669| 0.6553598 | 0.22487336 | -0.113584 | 0.0190669 | -0.001362 | 3.423E-05
2 1.1258065 | 0.6506015| 0.2318719 | -0.117139 | 0.0198273 | -0.001428 | 3.616E-05
5 1.424489 | 0.6620312| 0.222184 | -0.115032 | 0.0197897 | -0.001441 | 3.667E-05
10 1.5850968 | 0.6825591| 0.20021482 | -0.10711 | 0.0185666| -0.001353 | 3.418E-05
20 5% | 1.7200166| 0.7080383| 0.17219149 | -0.096592 | 0.0168551| -0.001224 | 3.048E-05
50 2% | 1.8736345| 0.7649483| 0.10527054 | -0.068783 | 0.0116344| -0.000762| 1.48E-05
100 1% 1.976603 | 0.8128499 | 0.048541624| -0.044997 | 0.0071252| -0.000359 | 1.091E-06

 

Catchment Data

 

 

 

 

Details: Variable | Value Units

Exisiting Scenario - SUB3 Area: 1.78 ha
fi 0.21 fraction
Cio 0.55 fraction

 

 

 

 

 

Rational Method Summary:

Overland flow time (min) 20.60
Pipe flow time (min)

Adopted Time of Concentration (tc) (min) 20.6
Duration (hours) 0.3

Freq Factor 0.80 0.85 1.05 1.15 1.20

Duration (hours) 20.60 20.60 20.60 20.60 20.60

Duration (min) 0.34 0.34 0.34 0.34 0.34

Intensity (mm/hr) 70.15, 78.92 142.26 165.46 183.04
Discharge (m°/s) 0.1536 | 0.1837 0.4089 0.5209 | 0.6013