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<br /> <br />waf~r R~$Ctlrct1$ CCn$../fChI$ Inc. <br /> <br />FIGURE- 2 <br /> <br />, <br /> <br />~. v,- <br />~;- "-. ., <br /> <br />Soul. 1 <br /> <br />CHAP!ERJII <br />STUDY AREA DESCR!PTION <br /> <br />A. DrainaKe Basin Characteristics <br /> <br />c <br />" <br />-',' <br />" <br />, " <br />:10j" <br />" <br /> <br />-' <br /> <br />The drainage basin of St. Vrain Cteek abo~e the Boulder/Weld County Lin<' <br />extends to the Continental Divide, as shown On Figure-2. Major tributaries <br />of St. vfain Creek affecting the study re"ch includ~ North St. Vrain Creek, <br />South St. Vrai" Cre~k, Dry Creek No. I, and Lefthand Creek. North ~nd South <br />St. Vrain Creeks draio the higher elevations of the drainagc basin along the <br />eastern slopes of the Continental Divide and ~et at Lyun., Colorado to form <br />~he main stream of St. Vrain Creek. Th~ Creek flows southeasterly froro Lyons <br />to Longmont, thence northeasterly to th~ South Platte Ri~er. <br /> <br />The TIl.a"iroum b~sin elevation is approdmately 14,255 feet On Long'" <br />Peak and the minimum ele~ation at tile do",ustredm limit of the study is approx- <br />imately 4906 feu abovc m~an sea level (MSL). <br /> <br />TI'-<' drainage area for St. Vrain Creek and its triblltaries at .1 numbel. of <br />poillts is lht,'d ill Tahl~-2. <br /> <br />A ~Umbcr of small lake. "nd rcscrvoit. exist in the upper portions of <br />the basLn including Longmont's major ra\lwater storage rcsprvo ir. Bl1tton <br />Rock Reservoir, cOmplc~ed io 19&9 by the City of Lo~gmont On ~orth St. Vrain <br />Creek about si" miles "est of Lyons, imp<<cts tlw p~"k flows g~ner"ted Oil ~orth <br />St. V rain Creek b>. a ~ tenuat ing the pe ak f 10"'" a. they are routed th rOl1gh the <br />reser~oit. The faci li~y "as constructed for municipal war..r supply storage alld <br /><loes [lot provi<le tor a HOOd storag<, tunnion, altbol1gh it provldes so::", residual <br />floud control effects downstrea~. The dToinagc area dbove th~ dam is appTOx- <br />i""'tely 109 square miles. NUmCTOl1S s",<llleT reservoirs art' loc<lted throl1gh"ut <br />the J"","r St, Vrain Creek ba.in cOllstrl1ctcd priIIlsrily fOT l1gricuhural purposc.'. <br />These reservoir., at though con"truttccl f,,., irrigatio~ pur.p""es, pnNide '00>;, <br />res idual flood cont rol benet its. b,,~ ~o a less" r degree than t~.at ::>rovide~ <br />by Buttoo Rock Re.~tv~ir. <br /> <br />-))- <br /> <br />-14- <br /> <br />~ <br />~ <br /> <br />~ <br />tI) <br />~ <br /> <br />~. <br />. <br />~ <br />~ <br />~ <br />~ <br />! <br />. <br />, <br />~ <br />~ <br />,- <br />" <br />&:iil <br />~>:! <br />~ ~l;j <br />~ 0.;::", <br />