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<br />001821 <br /> <br />. <br /> <br />The percentage figures illustrate the progressive shUt Of <br /> <br /> <br />melting - and runoff - from lower to higher levels. From October through <br /> <br /> <br />February the base flow is apt to be nearly proportionnl to area at all <br /> <br /> <br />levels, nl though the large areas of' bare rock at the highest levels do <br /> <br /> <br />tend to reduce base f'low at these levels below a strictly ar<lal propor- <br /> <br /> <br />tion, especially after dryer nod warmer summers. As melting bep,ins at <br /> <br /> <br />the lower levels, f'low from the upper levals, while increasing somewhat, <br /> <br /> <br />drops to a very low percentage of total runoff, usually much below that <br /> <br /> <br />directly proportional for the ereas involvod. <br /> <br /> <br />Upon rising limb of the spring flood, runoff from the higher <br /> <br /> <br />areas continues less th1lIl proportional to area and it is only atter the <br /> <br /> <br />pock of the flood is passed late in Moy or early in Juno that the higher <br /> <br /> <br />areas bogin to sho~\' runoff that is greatly in excess of areal proportions. <br /> <br /> <br />Such proportionally high rates of runoff continue from the higher areas <br /> <br /> <br />until practically the end of the wator year, on September 30, although <br /> <br /> <br />thi s fact is often ob anured by the usual fall rains. <br /> <br /> <br />Theso facts are indicated by the percentage figures shown in <br /> <br /> <br />Table No. 5 showinG the ralations between rates 01' flow at SOmerset, <br /> <br /> <br />Horse Ranch and Lllke Brennuu, ~:nd are very well illustrated by the rela- <br /> <br /> <br />tions between SUcll rates at the two lower stations. It is concluded <br /> <br /> <br />that the annual runoff from the area above Lake Brennon will be about 20% <br /> <br /> <br />of thnt rl10wn or estimated for the Horse Ranch station. The area above <br /> <br /> <br />Lnke Brennon is 16% of that above Horse R~Jlch, and at 1,100 feet higher <br /> <br /> <br />nveragu elevation. While it is logicnl to expect deeper anow and greater <br /> <br /> <br />water content at the higher elevations it seems probable that losses from <br /> <br /> <br />the hard bare summits of the mountains are as great end probably greater <br /> <br />. <br /> <br />.., <br /> <br />-14- <br />