Laserfiche WebLink
<br />11-6 <br />• Fhmmole ll-1-A watershed with an average elevation of 4,600 feet <br />had temperature station readings of 38° F, at a 5600-foot elevation, <br />and 48° F. at a 3000-foot elevatlon. The average temperature for <br />the watershed is then: <br />(3S) 1000 (4600 - 5600) =42.0 <br />(48) 1000 (4600 - 3000) =41.6 <br />Sum: 83.6 <br />Average: 41.8 <br />Round off to: 42 <br />While further refinements, such sa weighting, can be made, they are seldom <br />justified. <br />K factors <br />The constant K in equation 11-1 ie ]mown to vary not only from watershed <br />to watershed, but also from day to day oa a given watershed. It is <br />seldom possible to do more than make a broad estimate of K. An average <br />value of 0.06 can be used. The following table may be of assistance in <br />special cases: <br />Table 11-3. K factors <br />• <br />_'.- . <br />:... <br />Condition K <br />bctremely low runoff potential 0.02 <br />Average heavily-forested areas; .04 - .06 <br />north-facing slopes of open country <br />Average .06 <br />South-facing elopes of forested areas; <br />average open country .06 - .OS <br />ESctremely high runoff potential .30 <br />Recommended by A. L. Sharp. <br />;; <br /> <br />