Laserfiche WebLink
<br />6. Water Resourcea <br /> <br />a. Water Yield <br /> <br />(1) Alternative One <br /> <br />Estimated water yield for Alternative One is: shown in Table <br />IV-3. Sane increased water yield above bas,e1ine may occur <br />during intense surmner thundershowers (runoff Ifran irrpervious <br />surfaces such as roofs and asphalt) and !from irrigation <br />reduction although the net change would be ~ery minor. For <br />comparison purposes with Alternatives '!Wo ahd Three, then, <br />Alternative One water yield is assumed to ibe the same as <br />existing conditions (Table IV-3). <br /> <br />(2) Alternatives Two and Three <br /> <br />Tree ranoval, primarily in the form of patch and strip <br />cutting for ski runs will increase wate~ yield through <br />increased efficiency of snow accumulati~n and reduoed <br />evapotranspiration loss. On the cutover ~reas, fall soil <br />moisture deficits will be considerably lesf than prior to <br />forest cover removal, making more wate~ available for <br />streamflow. More snow will accumulate in ,the openings in <br />strip and patch cuts and less will accumu1at~ in the adjacent <br />uncut forest. The snow in open areas will imelt earliest in <br />the spring, resulting in higher streamflow o? the rising linb <br />of the hydrograph. , <br />I <br />streamflow levels on the rising side of thr hydrograph will <br />be increased on all watersheds. Sane increa e in late stmner <br />flows will also occur as the result of deve o~ent. Highest <br />increases fran the proposed develo~ent will occur on Windy <br />Pass Creek. Although highest percentage inqreases will be on <br />Bootjack Creek, annual r;e<<k flows will occur about seven to <br />nine days earlier each spring and with: about the same <br />magnitude as the pre-logging and develo~f.nt peaks on all <br />watersheds. Peak flows in Apr il and May w~ll be increased 7 <br />but the highest peak flows (late Mayor earfly June) will not <br />change. Changes in streamflow during Jljne and July are <br />expected to be insignificant, and late-sea~on (winter) base <br />flows should remain at near-baseline levels after <br />developnent. Table IV-3 compares the var,ious alternatives <br />with existing water yields. <br /> <br />Snowmaking equipnent will most likely be pnly on the lower <br />slopes. Snow density and water content ofl manrnade snow are <br />dependent on the variables of pressure~ temperature and <br />nozzle equi~ent. More recently, state-oft-l:he-art equipnent <br />and procedures include additives that pr04uoe a drier snow. <br />The net effect of snowmaking is to even put the snow pack <br />over time. Artificial snow is proclucedonly to supplement <br /> <br />166 <br />