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Glen - REC13/0146 Flood Study BSM 30 April 2014. Email 2 Attachment 2
Attached to the e-mail REC13/0146 - Response to Information Request - Email 2.
Concentration Times
Subareas 1 - 5
Average Stream Velocity: 5-6% catchment slope = hilly; T = 1206 / 0.9 x 60 = 22 mins
Components Of Flow: 40 m sheet flow @ 10% = 9 mins
530 m steep [email protected] m/sec = 7 mins
730 m [email protected] – 1.1 m/sec = 12 mins
Total: 28 mins
Bransby-Williams: T = 58 L / A0.1 Se0.2 = 58 x 1.206 / 66.8 0.1 x 1.04 0.2 = 46 mins
From 22, 28, 46 mins (average 32) : Adopt Tc = 30 mins
Subarea 7
55 m sheet flow @ 4-5% = 12 mins
230 m swale/channel @ 5% = 4 mins
Total: 16 mins
Subarea 8
130 m sheet flow, partly lawn @ 7% = 16 mins
Subarea 9
85 m sheet flow @ 8% = 13 mins
Brisbane Stormwater Management Pty Ltd Document File: ValkevSDF.Doc Page 24
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