Glen - REC13/0146 Flood Study BSM 30 April 2014. Email 2 Attachment 2

Subareas 12 — 16

Std inlet time for 10% grade = 9 mins
150 m pipe/kerb along Tewantin Rd@ 6% = 1.2 min
60 m pipe/kerb along Kauri St@ 4% grade = 0.6 mins
115 m pipe/kerb along Pearl St @ 4% grade = 1.2 mins
115 m pipe flow to sapphire [email protected]% grade = 1.8 mins
260 m open easement [email protected]% grade = 6.0 mins

370 m natural floodway @ hydraulic model 0.8 m/sec = 7.7 mins
Total: = 27 mins

Subarea 17

130 m sheet flow @ 4% = 19 mins

Subarea 18

90 m sheet flow @ 4%, partly lawn = 16 mins

Subarea 19
85 m sheet [email protected]%, average grass = 19 mins

85 m natural [email protected] m fall = 5 mins
Total: 24 mins

Q=0.00278 x FxCxIx A

(F = 0.80 / 0.85 / 0.95 / 1.00 / 1.05 / 1.15 / 1.20)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Subs Fi | C10 Tc I (mm/hr) A Q (m3/s)
(min)| 1/2 / 5 / 10 / 20 / 50 / 100 | (Ha)} 1/2 /5 / 10 / 20 / 50 / 100
1-5 | 0.21 | 0.74 | 28 60/67 / 90 / 107 / 123 / 140 / 155 | 66.8 | 6.0/7.6/11.5/14.2/16.9 /21.5 /24.6
7 0.20 | 0.74 | 16 80/90 /120/ 140 / 158 / 183 / 202 | 2.2 | 0.29/0.35/0.52/0.63 /0.75/ 0.95/ 1.10
8 0.06 | 0.71 16 80/90 /120/ 140 / 158 / 183 / 202 | 2.0 | 0.25/0.30/0.45/0.55 / 0.65 / 0.83/ 0.96
9 0.10 | 0.72 | 13 89 /100/133/ 155 / 175 / 201 / 221 | 1.64 | 0.23/0.27/ 0.40 / 0.49 / 0.59 / 0.74 / 0.85
12-16 | 0.50 | 0.80 | 24 61/73/ 98 / 116 / 130 / 153 / 165 | 44.4 | 4.8/5.8 /8.6 /10.8 /12.8 /16.3/ 18.7
17 0.00 | 0.70 | 19 73: 182/109 / 129 / 148 / 167 / 186 | 1.9 | 0.22/0.26/ 0.38 / 0.48 / 0.57 / 0.71 / 0.83
18 0.04 | 0.71 16 80/90/120/ 140 / 158 / 183 / 202 | 1.7 | 0.21/0.26/0.38/0.47/0.56/0.71/0.81
19 0.09 | 0.72 | 24 65/ 73/ 98/ 116/ 130/ 152 / 166 | 1.99 | 0.21/0.25 / 0.37 / 0.46 / 0.54 / 0.70 /0.79

 

 

Brisbane Stormwater Management Pty Ltd Document File: WalkevSDF.Doc

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