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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 Subarea 7 As per “Pre-Development”, Tc = 16 mins Subarea 8 QUDM std inlet time, 6 – 7% slope = 10 mins Subarea 9 Most of the area is within the 100 yr flood boundary: adopt Tc = 5 mins. Subareas 10 - 18 50 m sheet flow across lawn @ 8% = 13 mins 50 m swale/pipe @ 1% = 1 min Total: = 14 mins Subarea 19 30 m sheet flow across lawn @ 3% = 10 mins 45 m pipe / swale @ 2% = 1 min Total: = 11 mins Subarea 20 Most of the area is within the 100 yr flood boundary: adopt Tc = 5 mins Subarea 29 - 35 70 m sheet flow across lawn @3% = 17 mins 65 m pipe/kerb @ 2 m fall = 1 min 160 m pipe @ 6 m fall = 2 mins Total: = 20 mins Brisbane Stormwater Management Pty Ltd Document File: ValkevSDF.Doc Page 27
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