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

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Drainage Design Manual for Maricopa County Hydrology: Rainfall Losses eter values for drainage areas can result in the generation of no rainfall excess which may or may not be correct. Incorrect results could cause serious consequences for flood control planning and design. Therefore, it is recommended that, for watersheds consisting of relatively small subareas of sand, the Green and Ampt parameter values for loamy sand be used for the sand portion of the watershed. If the area contains a large portion of sand, then either the Green and Ampt method should be used with the parameter values for loamy sand or the IL+ULR method should be used with the appropriately determined values for the parameters. Table 4.1 GREEN AND AMPT LOSS RATE PARAMETER VALUES FOR BARE GROUND Soil Texture XKSAT PSIF DTHETA 1 Classification inches/hour inches Dry Normal Saturated (1) (2) (3) (4) (5) (6) loamy sand & sand 1.20 2.4 0.35 0.30 0 sandy loam 0.40 4.3 0.35 0.25 0 loam 0.25 3.5 0.35 0.25 0 silty loam 0.15 6.6 0.40 0.25 0 silt 0.10 7.5 0.35 0.15 0 sandy clay loam 0.06 8.6 0.25 0.15 0 clay loam 0.04 8.2 0.25 0.15 0 silty clay loam 0.04 10.8 0.30 0.15 0 sandy clay 0.02 9.4 0.20 0.10 0 silty clay 0.02 11.5 0.20 0.10 0 clay 0.01 12.4 0.15 0.05 0 Notes: 1. Selection of DTHETA Dry = Nonirrigated lands, such as desert and rangeland; Normal = Irrigated lawn, turf, and permanent pasture; Saturated = Irrigated agricultural land. 4-10 August 15, 2013
Drainage Design Manual for Maricopa County FIGURE 4.3 COMPOSITE VALUES OF PSIF AND DTHETA AS A FUNCTION OF XKSAT (TO BE USED FOR AREA-WEIGHTED AVERAGING OF GREEN AND AMPT PARAMETERS) Hydrology: Rainfall Losses August 15, 2013 4-11
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