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

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Drainage Design Manual for Maricopa County Figure 3.1 RESISTANCE COEFFICIENT K b AS A FUNCTION OF WATERSHED SIZE AND SURFACE ROUGHNESS CHARACTERISTICS Hydrology: Rational Method 0.20 0.18 0.16 Resistance Coefficient, K b 0.14 0.12 0.10 0.08 0.06 0.04 0.02 D - Maximum Roughness C - Moderately High Roughness B - Moderately Low Roughness A - Minimal Roughness 0.00 1 10 100 1000 160 acres Watershed Surface Area, in acres 3-4 August 15, 2013
Drainage Design Manual for Maricopa County Hydrology: Rational Method Table 3.2 RUNOFF COEFFICIENTS FOR MARICOPA COUNTY Runoff Coefficients by Storm Frequency 1, 2 Land Use 2-10 Year 25 Year 50 Year 100 Year Code Land Use Category min max min max min max min max VLDR Very Low Density Residential 3, 4 0.33 0.42 0.36 0.50 0.40 0.60 0.45 0.65 LDR Low Density Residential 3, 4 0.42 0.48 0.46 0.55 0.50 0.64 0.53 0.70 MDR Medium Density Residential 3, 4 0.48 0.65 0.53 0.72 0.58 0.78 0.60 0.80 MFR Multiple Family Residential 3, 4 0.65 0.75 0.72 0.83 0.78 0.90 0.82 0.94 I1 Industrial 1 3 0.60 0.70 0.66 0.77 0.72 0.84 0.75 0.88 I2 Industrial 2 3 0.70 0.80 0.77 0.88 0.84 0.95 0.88 0.95 C1 Commercial 1 3 0.55 0.65 0.61 0.72 0.66 0.78 0.69 0.81 C2 Commercial 2 3 0.75 0.85 0.83 0.94 0.90 0.95 0.94 0.95 P Pavement and Rooftops 0.75 0.85 0.83 0.94 0.90 0.95 0.94 0.95 GR Gravel Roadways & Shoulders 0.60 0.70 0.66 0.77 0.72 0.84 0.75 0.88 AG Agricultural 0.10 0.20 0.11 0.22 0.12 0.24 0.13 0.25 LPC Lawns/Parks/Cemeteries 0.10 0.25 0.11 0.28 0.12 0.30 0.13 0.31 DL1 Desert Landscaping 1 0.55 0.85 0.61 0.94 0.66 0.95 0.69 0.95 DL2 Desert Landscaping 2 0.30 0.40 0.33 0.44 0.36 0.48 0.38 0.50 NDR Undeveloped Desert Rangeland 0.30 0.40 0.33 0.44 0.36 0.48 0.38 0.50 NHS Hillslopes, Sonoran Desert 0.40 0.55 0.45 0.60 0.48 0.66 0.50 0.70 NMT Mountain Terrain 0.50 0.70 0.65 0.80 0.70 0.90 0.75 0.90 Notes: 1. Runoff coefficients for 25-, 50- and 100-Year storm frequencies were derived using adjustment factors of 1.10, 1.20 and 1.25, respectively, applied to the 2-10 Year values with an upper limit of 0.95. 2. The ranges of runoff coefficients shown for urban land uses were derived from lot coverage standards specified in the zoning ordinances for Maricopa County. 3. Runoff coefficients for urban land uses are for lot coverage only and do not include the adjacent street and right-of-way, or alleys. 4, Values are based on the NDR terrain class. Values should be increased for NHS and NMT terrain classes by the difference between NHS (or NMT) and the NDR C values, up to a maximum of 0.95. Engineering judgement should be used. 5. Maricopa County has adopted specific values of C for each land use and storm frequency in the Drainage Policies and Standards for Maricopa County, Arizona (Maricopa County, 2007). These are the standard default values. The engineer/hydrologist may develop a computed composite value of C based on actual land uses, but must fully document the computations and assumptions and submit them to Maricopa County for approval. Many jurisdictions in Maricopa County may have adopted specific C coefficient values and procedures. The user should check with the appropriate agency before proceeding. August 15, 2013 3-5
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