100YEAR RETURN PERIOD Q=32.32m3/s for a free board of 0.1m D=2.2m B = 1.809 * 2.1 = 3.8 Hydraulic mean depth M1= 0.5D = 0.5*2.1=1.05 B=4m By manning’s formula: = 4.76m/s >3.0m/s NOT O.K Area of flow, A= 1.909D2 =8.4m2 V=4.76m/s Capacity of channel QC = 4.07m3/s >32.32 m3/s A=8.4m2 QC=40.07m3/s CALCULATION SHEET KOBIL CULVERT SHEET NO. 14 REF CALCULATIONS OUTPUT
100YEAR RETURN PERIOD Q=32.32m3/s for a free board of 0.1m B = 1.809 * 2.1 = 3.8 Hydraulic mean depth M1= 0.5D = 0.5*2.1=1.05 By manning’s formula: = 4.76m/s >3.0m/s NOT O.K Area of flow, A= 1.909D2 =8.4m2 Capacity of channel QC = 4.07m3/s >32.32 m3/s D=2.2m B=4m V=4.76m/s A=8.4m2 QC=40.07m3/s CALCULATION SHEET KOBIL CULVERT SHEET NO. 14 REF CALCULATIONS OUTPUT
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