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i ~~ ~~c~ <br />S <br />1, 0 S iJTL`SARY <br />A study was performed on a 4,6 mile reach of. the Yampa <br />River near Craig, Colorado on 28-3I August 1978 to determine if <br />the river gains or loses flow in the vicittity of Big Bottom. <br />Flow and weather conditions were considered ideal. Field data <br />were cons istenc and the hydrologists felt that most of the data <br />gathered were excellent. ' <br />The results of the investigation were as follows: <br />• ~~ <br />i <br />A. <br />!, <br />~.i <br />• The reach of interest was from S.H. 13 to <br />the confluence of the Yampa River and Williams <br />Fork (the area known as Big Bottom). A net <br />loss of eight to nine cubic feet per second <br />(cfs), exclusive of evapotranspiration, was <br />~ observed across this reach. A 2.2 mile por- <br />tlOn of this reach was iden~ified as the <br />area in which all potential and confirmed <br />sL~face/ground-water exchanges were occur- <br />ring, <br />The river was losing 10 to 17 cfs to ground- <br />water recharge over an 800 foot stretch be- <br />ginning 1.0 miles upstream of the confluence <br />with William Fork. <br />• As suggested by the difference between the <br />above two loss rates, some ground-water dis- <br />charge to the Yampa River may have been oc- <br />curring over a one mile stretch beginning <br />two miles downstream of the S.H. 13 bridge. <br />However, the data were inconclusive and fur- <br />ther study is required to verify [his. <br />1-1 <br /> <br />