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

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Drainage Design Manual for Maricopa County Hydrology: Application 1. Point Rainfall Depth: From Figure A.58 and Figure A.60 of APPENDIX A, P 6 100 = 2.70 inches P 24 100 = 3.62 inches 2. Depth - Area Reduction Factors: Inspection of Figure 9.1 yields the following: • Subbasin areas range from 0.83 to 22.87 square miles • Drainage areas at concentration points (CP) range from 0.44 to 22.9 square miles • Selected index areas and corresponding depth-area reduction factors from Table 2.1 or Figure 2.1 for the 6-hour storm, and Table 2.2 or Figure 2.2 for the 24-hour storm are: 6-hour 24-hour Area sq. miles Depth-Area Reduction Factors Area sq. miles Depth-Area Reduction Factors 0.01 1.000 0.01 1.000 0.50 0.994 0.50 0.998 2.80 0.975 2.00 0.990 16.00 0.922 10.00 0.950 25.00 0.900 25.00 0.909 Rainfall Distribution 3. The 6-hour pattern numbers corresponding to the selected index areas are 1, 2, 3 and 3.3. Dimensionless rainfall distributions for pattern numbers 1, 2 and 3 are taken directly from Table 2.4. The distribution for pattern number 3.3 is determined by linear interpolation between pattern numbers 3 and 4 as listed in Table 2.4. The dimensionless distribution for pattern number 3.3 is: 9-6 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Application Time hours Pattern 3.3 Time hours Pattern 3.3 Time hours Pattern 3.3 0:00 0.0 2:15 13.1 4:30 86.0 0:15 1.7 2:30 14.8 4:45 90.5 0:30 2.5 2:45 16.7 5:00 94.0 0:45 3.6 3:00 19.2 5:15 95.6 1:00 5.5 3:15 24.0 5:30 97.0 1:15 7.0 3:30 32.2 5:45 98.6 1:30 8.5 3:45 48.0 6:00 100.0 1:45 10.1 4:00 66.6 2:00 11.6 4:15 78.9 For the 24-hour storm, the SCS Type II distribution is taken directly from Table 2.5 and is not a function of area. August 15, 2013 9-7
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