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

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Drainage Design Manual for Maricopa County Hydrology: Application Compute the Time of Concentration (T c ) and Intensity (i) for concentration point C1 using Equation (3.2) and the data from Table 9.5. Use a log interpolation to compute i. Concentration Point C1: T c 11.4L 0.5 0.52 – 0.31 = K b S Start with an initial estimate for T c of 15 minutes. - From Table 9.5, i = 5.26 inches/hour for a 15-minute duration. Recompute i for T c of 13.3 minutes. i – 0.38 c = 11.4( 0.729) 0.5 ( 0.091) 0.52 ( 473.0) 0.31 T c = 0.415 – 0.38 – i – 0.38 T c = 0.415( 5.26) – 0.38 = 0.221 hours = 13.3 min - From Table 9.5, i = 5.26 inches/hour for 15 minutes, and i = 3.55 inches/hour for 30- minutes ( ( ( 13.3 – 15) ⁄ ( 30 – 15 )) ( log 103.55 – log 10 5.26) + log 10 5.26) i = 10 = 5.50 inches/hour T c = 0.415( 5.50) – 0.38 = 0.217 hours = 13.0 min Difference is less than 1%. Use T c = 13.0 min, i = 5.50 inches/hour Compute the peak discharge at C1: Concentration Point C1: Q = ( 0.63) ( 5.50) ( 78.59) = 272 cfs 7. The peak discharge at concentration point C2 can be computed in a similar manner. Keep in mind that the Combined Watershed Method is not implemented in DDMSW. 8. Compute the peak discharge for concentration points C1 and C2 using the Triangular Hydrograph Method. 9-22 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Application Concentration Point C1: Plot triangular hydrographs for subbasin S1 and subbasin S2 using the template shown on Figure 3.2. Add the hydrograph ordinates to create a total flow hydrograph at concentration point C1. Refer to Figure 9.5. Figure 9.5 RATIONAL METHOD HYDROGRAPHS AT CONCENTRATION POINT C1 Concentration Point C2: Plot triangular hydrographs for concentration point C1, subbasin S3 and subbasin S4 using the template shown on Figure 3.2. Add the hydrograph ordinates to create a total flow hydrograph at concentration point C2. Refer to Figure 9.6. August 15, 2013 9-23
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