2014022_71_SeaviewTce_SWMP-revC_full · OPW16/0021

Flow Calculation                                                                                                             3



  Flow Calculations
 Step 1 Select time of concentration calculation method
 Ensure you fill in the "Time of Concentration" sheet first
 Elect one method - 1 for Bransby Williams, 2 for Pilgrim and Mcdermot, 3 for Qld DMR method, 4 for Modified Friend or 5 for adopted Tc
 Method                         5            Adopted Tc          6 min

 Step 2 Select which IFD table to use
 Elect to use either the calculated IFD table on the first sheet or the user input IFD table input below
 Input 1 for calculated IFD or 2 for user input IFD
 IFD table                      1

 Step 3 Select Runoff Coefficient Model
 Elect either the rural or Urban Model
 Input 1 for Rural or 2 for Urban
 C Model                        1


                                        Flow by Rational Method Q=0.278*C*I*A
 Return Period                 1           2           5        10       20                  50          100            25
                   C        0.48        0.48        0.48      0.48     0.54                 0.6         0.63
            tc (min)        6.00        6.00        6.00      6.00     6.00                6.00         6.00
                  I10      120.6       153.2      188.9      209.3    237.6               274.6        302.7

             Q m3/s         0.19        0.24         0.30        0.33        0.42          0.54            0.62        0.4




Z:\AquaIntel Projects\2014022_Seaview_Tce_SWMP\hydrology\Rational Method_Seaview.xls                        9/24/2014 2:51 PM