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<br />10 LOSS RATE DATA (L Cards) <br /> <br />HEC-1 INPUT DESCRIPTION <br />LOSS RATE DATA (L Cards) <br /> <br />One of four different rainfall loss rate procedures may be used for a <br />subbasin runoff computation. A different loss rate may be used for each <br />subbasin and/or plan. Snowmelt loss rate (LM card) may be used in <br />conjunction with the exponential (LE card) or uniform (LU card) loss <br />rates. <br /> <br />. <br /> <br />. <br /> <br />FIELD VARIABLE <br /> <br />VALUE <br /> <br />10.1 LU CARD - INITIAL AND UNIFORM LOSS RATE <br /> <br />DESCRIPTION <br /> <br />Col 1+2 ID <br /> <br />LU <br /> <br />1 STRTL <br /> <br />0,+ <br /> <br />-1 <br /> <br />2 <br /> <br />0,+ <br />or - <br /> <br />CNSTL <br /> <br />3 <br /> <br />RTIMP <br /> <br />+ <br /> <br />4-6 <br /> <br />( <br /> <br />i <br /> <br />Card identification. <br /> <br />Initial rainfall/snowmelt loss in inches <br />(mm) for snow free ground. If operating in <br />the optimization mode (OU card) , this <br />variable will be fixed at this value and not <br />optimized. <br /> <br />For optimization only (OU <br />supplied), program will <br />value and then optimize. <br /> <br />card previously <br />assume a starting <br /> <br />Same as (-1) above but program uses this <br />value (after sign change) as the starting <br />point for the optimization. <br /> <br />Uniform rainfall/snowmelt loss in <br />inches/bour (mm/hr) which is used after the <br />starting loss STRTL is completely satisfied. <br />See field 1 for meaning of VALUE. <br /> <br />Percent of drainage basin that is <br />~ervious. No losses are computed for this <br />portion of the basin. <br /> <br />Specify loss rate <br />Fields 1-3 <br />subcatchment. <br /> <br />variables similar to <br />for second kinematic <br /> <br />Page 37 <br />