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<br />.'"' "- <br />":.q:\ :~..~:-i <br /> <br />. 'c..~'" <br /> <br />'''/":'. .,~ <br /> <br />1/-7i-'ft:. <br /> <br />0-5755 <br /> <br />.'~. ':-. <br /> <br />-~,. <br /> <br />'Melilorariifrll <br />To: Regional D1l'ettor. hlt,L.ke City UT <br />Attention: UC~115 (Gold) <br /> <br />,. -"'~'~':-.. <br /> <br />From: Chief, Earth Sciences Q1v\s1on <br /> <br />Subject: BaseHne Hydrologic Refe,ence Information for the Glen C~nyon Dill <br />EnvlronmentalIlllpact Statement (Environmental Impact Stateme,nt) <br /> <br />The enclosed doculIM!nt,ent1tled~GraphiC11 Detail of Historic Strealllflows, <br />Water Releases and Reservo.ir Storage for Glen Canyon Dam and Lake Powell-, ,hIS <br />been prepared in support of th, Glen C.nyon Da. Environmental Impact State.ent <br />(GCDEIS). Its purpose. 'is to facilitate GCDElS decision-making by pro.vlC1f1lg . ." <br />detailed perspectives on./listor1c (pre"dam and post-dam) hydrologic pitte~s,~ <br />in the vicinity of the G1J!n Canion DUI site. It includes appro~1i1ate17 380': <br />time series and flow-duration. ('requ~cl) graphs based on recorded streUflOllf, <br />water release, and reservoir storage 1 nforllat1 on. . '. '.' <br /> <br />OiscerniBg Information from th~ graphs is left to .the reader, though qUest~ons <br />concerniBg Interpretation are encouraged and may be directed to the Vater " <br />Management Section (Surface Water Branch) in Denver at (303) 236-0216. The <br />document has been prepared by Section engineers: Nancy Parker, Mary waUer, <br />Mark Croghan, and Mike Madigan, under the d1.rection of Craig Phillips; GCDEIS. <br />team mear for hydrology. . <br /> <br />Intended audiences 'are primarily the teams of personnel responsible 'for,the <br />preparation of the GCDEIS. However, it is recognized that others with. <br />interests in the Colorado River may fjnd this document useful as well.. The <br />document has been labeled -draft,- recognizing that refinements will be <br />possible by incorporating feedback, from users. As refinements are made, '. <br />modified pages will be.ailed to recipients of the document. A master 11$to'. <br />recipients will be maintained for .tllts purpose. Users of the document are " <br />encouraged to call the Vater Management Section with questions or suggestions. <br /> <br />'M. t~ Hyatt <br /> <br />Enc 1 osure <br /> <br />cc: Copies to persons on attached' sheet <br />(w/encl to each) <br /> <br />be: 0-5000, 0-5100, 0-5150, O~57DO; 'D-5750, 0-5755 <br />(w/o encl to each) . , <br /> <br />WBR:CPhi11 ips:ert:U/19/90:~36-0~16 (VP:PC: 5755-1b:GCOEIS.HEM)ENV 6~OO., <br />