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<br />HEC~l INPUT DESCRIPTION <br />SNOWMELT DATA (M Cards) <br /> <br />11 SNOWMELT DATA (M Cards) <br /> <br />M cards are required only if snowfall/melt computations are to be <br />made. Snow computations are accomplished in separate, equally <br />incremented, elevation zones within each subbasin. Melt may be computed <br />by the degree-day or .energy-budget method. <br /> <br />. <br /> <br />.. <br /> <br />11.1 MA CARD - ELEVATION ZONE DATA . <br /> <br />These cards are required for snowfall/melt simulation. <br /> <br />FIELD VARIABLE VALUE DESCRIPTION <br />Col 1+2 ID MA Card identification. <br />1 ARFA(l) + Drainage area in sq mi (sq km) in Zone 1 <br /> (lowest zone). <br />2 SNO(l) + Average water equivalent in inches (mm) of <br /> snowpack at start of this job (first <br /> interval of NQ) in Zone l,'corresponding to <br /> ARFA(l) . <br /> <br />3 <br /> <br />ANAP(l) <br /> <br />+ <br /> <br />Normal annual precipitation in inches (mm) <br />for Zone 1, corresponding to ARFA (1). <br /> <br />NOTE: Up to 10 cards, one for each zone. Zones must be in equal elevation <br />increments corresponding to lapse rate coefficient TLAPS (MC-l). <br /> <br />~ <br /> <br />.. Page 42 <br />