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<br />'l'Oi(jl02 1.-- T dentil'ication and definition of the parameters used in thS' digi tal model <br /> <br />Component <br /> <br />Definition <br /> <br />Parameter <br />identifier <br /> <br />Units <br /> <br />Antecedent- <br /> <br />moisture <br /> <br />accounting <br /> <br />EVC <br /> <br />RR <br /> <br />BMSM <br /> <br />DRN <br /> <br />Inches <br /> <br />Inches <br /> <br />per hour <br /> <br />Pan coefficient that converts pan evaporation <br /> <br />to potential evapotranspiration. <br /> <br />Coefficient that proportions daily rainfall into <br /> <br />infiltration and surface runoff. <br /> <br />Maximum effective soil-moisture storage vol~rne <br /> <br />at field capacity. <br /> <br />Constant coefficient that controls drainage <br /> <br />rate of infiltrated soil moisture. <br /> <br />Infiltration <br /> <br />SWF <br /> <br />RGF <br /> <br />KSAT <br /> <br />Inches <br /> <br />Inches <br /> <br />per hour <br /> <br />Capillary potential, or soil suction, at wetted <br /> <br />front for field-capacity conditions. <br /> <br />Ratio that varies SWF over the soil-moisture <br /> <br />range from wilting point to field capacity. <br /> <br />Minimum saturated value of hydraulic conduc- <br /> <br />tivity used to determine infiltration rates. <br /> <br />Routing <br /> <br />TC <br /> <br />KSW <br /> <br />Minutes <br /> <br />HOUTS <br /> <br />Time characteristic for translation of rain- <br /> <br />fall excess by distance-area histrograms. <br /> <br />Time characteristic for linear reservoir <br /> <br />routing. <br /> <br />-7- <br />