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

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Drainage Design Manual for Maricopa County Hydrology: Application 2. From Figure 4.3, select the values for DTHETA (both dry and normal) and PSIF for each subbasin corresponding to the computed XKSAT from Step 1. Log-Averaged Bare Ground XKSAT . DTHETA Subbasin ID in/hr Dry Normal PSIF inches S1 0.29 0.35 0.25 4.55 S2 0.33 0.35 0.25 4.35 S3 0.20 0.38 0.25 5.30 S4 0.30 0.35 0.25 4.50 S5 0.32 0.35 0.25 4.40 S6 0.14 0.39 0.23 6.20 S7 0.23 0.36 0.25 5.00 S8 0.21 0.37 0.25 5.20 S9 0.11 0.36 0.17 6.80 S10 0.13 0.38 0.21 6.40 S11 0.24 0.36 0.25 4.90 3. Compute the arithmetically area-weighted surface retention loss (IA) for each subbasin using the data in Table 9.9: Subbasin S2: A T = 2, 816.9 acres IA = ------------------------------------------------------------------------------- ( 1189.8) ( 0.30) + ( 1627.1) ( 0.15) 2, 816.9 IA = ------------------ 601.00 = 0.21 inches 2, 816.9 Using the above procedure, the area-weighted IA values for each subbasin are as follows: Subbasin ID IA inches S1 0.15 S2 0.21 S3 0.28 S4 0.28 S5 0.26 9-30 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Application Subbasin ID IA inches S6 0.27 S7 0.24 S8 0.21 S9 0.27 S10 0.30 S11 0.17 4. Compute the arithmetically area-weighted percent impervious (RTIMP) for each subbasin for natural conditions using the data in Table 9.7: Subbasin S1: A T = 3, 480.4 acres ( 5.6) ( 0) + ( 873.3 + 167.2) ( 15) + ( 1723.5) ( 35)+ ( 50.6 + 2.4 + 137.1) ( 30) + ( 3.0 + 67.3 + 340.3 + 72.5) ( 60) + ( 36.0 + 1.6) ( 50) RTIMP N = ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 3, 480.4 RTIMP N = 112 -------------------- , 499 = 3, 480.4 32% Using the above procedure, the area-weighted RTIMP for each subbasin is shown in the table in Step 5. 5. Compute the arithmetically area-weighted RTIMP for each subbasin for developed conditions: Subbasin S3: A D = 2, 113.3 acres ( 106.9) ( 80) + ( 742.5) ( 15) + ( 81.3) ( 30) + ( 1, 103.1) ( 5) + ( 79.6) ( 0) RTIMP D = ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- 2, 113.3 RTIMP 27, 644 D = ------------------ = 13 % 2, 113.3 August 15, 2013 9-31
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