Drainage Design Manual, Hydrology - Flood Control District of ...

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Drainage Design Manual for Maricopa County Hydrology: Rainfall 2.4.3 24-hour Storm Distribution The 24-hour storm distribution that is to be used for flood studies and design of stormwater drainage facilities in Maricopa County is the SCS Type II distribution. This distribution is shown in Table 2.5 and Figure 2.6. The 24-hour storm distribution is used for flood studies of drainage area larger than 100 square miles (see Policies and Standards Manual). This distribution is also to be used in combination with the 6-hour storm distribution for drainage areas between 20 and 100 square miles to determine whether a local storm or a general storm will produce the greatest flood peak discharges or the maximum flood volumes. 2-16 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Rainfall Rainfall Table 2.5 24-HOUR DISTRIBUTION Rainfall Rainfall Time Depth Time Depth Time Depth hours % hours % hours % 0.00 0.0 8.25 12.6 16.50 89.3 0.25 0.2 8.50 13.3 16.75 89.8 0.50 0.5 8.75 14.0 17.00 90.3 0.75 0.8 9.00 14.7 17.25 90.8 1.00 1.1 9.25 15.5 17.50 91.3 1.25 1.4 9.50 16.3 17.75 91.8 1.50 1.7 9.75 17.2 18.00 92.2 1.75 2.0 10.00 18.1 18.25 92.6 2.00 2.3 10.25 19.1 18.50 93.0 2.25 2.6 10.50 20.3 18.75 93.4 2.50 2.9 10.75 21.8 19.00 93.8 2.75 3.2 11.00 23.6 19.25 94.2 3.00 3.5 11.25 25.7 19.50 94.6 3.25 3.8 11.50 28.3 19.75 95.0 3.50 4.1 11.75 38.7 20.00 95.3 3.75 4.4 12.00 66.3 20.25 95.6 4.00 4.8 12.25 70.7 20.50 95.9 4.25 5.2 12.50 73.5 20.75 96.2 4.50 5.6 12.75 75.8 21.00 96.5 4.75 6.0 13.00 77.6 21.25 96.8 5.00 6.4 13.25 79.1 21.50 97.1 5.25 6.8 13.50 80.4 21.75 97.4 5.50 7.2 13.75 81.5 22.00 97.7 5.75 7.6 14.00 82.5 22.25 98.0 6.00 8.0 14.25 83.4 22.50 98.3 6.25 8.5 14.50 84.2 22.75 98.6 6.50 9.0 14.75 84.9 23.00 98.9 6.75 9.5 15.00 85.6 23.25 99.2 7.00 10.0 15.25 86.3 23.50 99.5 7.25 10.5 15.50 86.9 23.75 99.8 7.50 11.0 15.75 87.5 24.00 100.0 7.75 11.5 16.00 88.1 8.00 12.0 16.25 88.7 August 15, 2013 2-17
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