Obtaining Data:Sample Values

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Overland Parameters


Source: From Goldman et al. (1986).


Unit conversion: 1 ton/ac = 2.267 t/ha. Sources: From Wanielista, 1978 and Goldman et ai. (1986).


Source: Wanielista (1978).


1Tread marks oriented up and down slope
2Tread marks oriented parallel to contours.
Source: From Goldman et al. (1986)


aEngman (1986), bDowner, cSenarath et al (2000)


Wetland Parameters

Stream Parameters


Source: From Lane.78


Culvert & Weir Parameters

Infiltration Parameters



Evapotranspiration Parameters

NOTE:- aThe smaller value is for high zenith angles; larger value for low zenith angles.
From b Sellers (1965); c Munn (1966); d Rosenberg (1974); e Oke (1973); f Lee (1978); g de Jong (1973); h Atwater and Ball (1981); and, i Eagleson (1970).


Source: Data from O.G. Sutton, "Micrometeorology," McGraw-Hill, New York, 1953.


from aPielke (1984), bGash and Stewart (1975), cMonteith (1975) and dSceicz and Long (1969)


NOTE: The vegetation heights listed in Table A.3 are sample values only. Those values may not be the representative, expected vegetation height-values of those vegetation/forest types.


Data from Lee (1980).


Groundwater Parameters



a Values in parentheses are standard deviations.
Data from Clapp and Hornberger (1978).




Field Capacity

From: Handbook of Hydrology, Maidment

which reproduces it from Rawls & Brakensiek, "prediction of soil water properties for hydrologic modeling", Watershed Management in the Eighties, ASCE


Specific Gravity


Weirs