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<br />..; ". " .'" <br />~~ 1...) " ...'J <br /> <br />These, "s well i'!S the Colorado-Big Thompson Project, the city of <br /> <br />Denver's transmountain diversions, and all other transmountain <br /> <br />diversion projects .'hich divert w~.ter from the Colorado River <br /> <br />Basin cause an unknown increa.se in th8 concentration of Colorado <br /> <br />River dissolved solid load. <br /> <br />B. Description of the Environ~ent <br /> <br />1. Existing Environment Without the Proposal <br /> <br />a. Climate.--Dati'l for this area and ~.ltitude is very scarce. <br /> <br />The nearest official data for the same altitude, 10,000 feet <br /> <br />pluS, is Climatoloeical DOlt" for Leadville, Colorado, on the <br /> <br />eastern slope of the Continental Divide. They recor0ed an <br /> <br />avernge annual temperature of 36.20 and ~n average aanual <br /> <br />precipitnticn of 18.48 inches. Because of East-I'lest Sl,'pe <br /> <br />differences it is estimi'\ted that the collcction system <br /> <br />precipi tat ion may be as hieh '"'s 30 - 40 inches per year rind <br /> <br />winter lows may reach -200. Climate is severe wi th possible <br /> <br />frost year-round. The area can be classified as subhumid <br /> <br />and most precipitation occurs as snowfall. (See Figure 6, <br /> <br />Weather Conditions) (1) <br /> <br />b. Topo<;raphy.--The Project arei'! west of th", Continental Divide <br /> <br />was formed by ancient geological upaenv~ls and structural <br /> <br />disturbances which resulted in an extensive uplift and <br /> <br />20 <br />