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

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Drainage Design Manual for Maricopa County Hydrology: Application Solution: 1. Select Runoff Coefficients (C) for each land use from the range of values in Table 3.2. This watershed is within unincorporated Maricopa County. Therefore, the following values are from the Drainage Policies and Standards for Maricopa County, Arizona (2007). Hillslopes, Sonoran Desert (NHS) C = 0.69 Undeveloped Desert Rangeland (NDR) C = 0.50 Low Density Residential (LDR, 130) C = 0.60 Medium Density Residential (MDR, 140) C = 0.71 Multiple Family Residential (MFR, 170) C = 0.94 Pavement (P, 2002) C = 0.95 Compute the arithmetically area-weighted C value for subbasins S1 through S4. Subbasin S1: Subbasin S2: ( 0.69) ( 54.72) + ( 0.50) ( 11.27) C w = ------------------------------------------------------------------------- = ( 65.99) 0.66 C w = 0.50 Subbasin S3: ( 0.50) ( 11.85) + ( 0.94) ( 8.39) + ( 0.95) ( 0.94) C w = ------------------------------------------------------------------------------------------------------------ = ( 21.18) 0.69 Subbasin S4: ( 0.50) ( 2.07) + ( 0.60) ( 16.50) + ( 0.71) ( 6.64) + ( 0.95) ( 2.59) C w = ------------------------------------------------------------------------------------------------------------------------------------------------- = 0.65 27.80 The runoff coefficients for each subbasin are: S1: C = 0.66 S2: C = 0.50 S3: C = 0.69 S4: C = 0.65 9-16 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Application Duration Table 9.4 EXAMPLE DEPTH-DURATION-FREQUENCY STATISTICS FROM GIS (Source: NOAA Atlas 14 Arizona, DDMSW GIS Method) Point Rainfall Depth Data in inches Storm Frequency, years 2 5 10 25 50 100 5-min 0.274 0.370 0.445 0.544 0.620 0.698 10-min 0.417 0.564 0.677 0.828 0.943 1.062 15-min 0.517 0.699 0.839 1.026 1.169 1.316 30-min 0.696 0.941 1.130 1.382 1.575 1.773 1-hour 0.862 1.165 1.398 1.710 1.949 2.194 2-hours 0.992 1.322 1.576 1.919 2.180 2.451 3-hour 1.030 1.354 1.608 1.960 2.237 2.529 6-hour 1.189 1.519 1.781 2.143 2.425 2.718 12-hour 1.338 1.689 1.967 2.338 2.624 2.918 24-hour 1.540 1.989 2.342 2.831 3.219 3.624 Duration Table 9.5 EXAMPLE COMPUTED INTENSITY-DURATION-FREQUENCY DATA (using Table 9.4) Point Rainfall Intensity Data in inches/hr Storm Frequency, years 2 5 10 25 50 100 5-min 3.29 4.44 5.34 6.53 7.44 8.38 10-min 2.50 3.38 4.06 4.97 5.66 6.37 15-min 2.07 2.80 3.36 4.10 4.68 5.26 30-min 1.39 1.88 2.26 2.76 3.15 3.55 1-hour 0.86 1.17 1.40 1.71 1.95 2.19 2-hours 0.50 0.66 0.79 0.96 1.09 1.23 3-hour 0.34 0.45 0.54 0.65 0.75 0.84 6-hour 0.20 0.25 0.30 0.36 0.40 0.45 12-hour 0.11 0.14 0.16 0.19 0.22 0.24 24-hour 0.06 0.08 0.10 0.12 0.13 0.15 August 15, 2013 9-17
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