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<br />EXPLANATION
<br />Prel;JO,ratJ{)r1""nd1es
<br />COlolC
<br />.'Ot020
<br />_201030
<br />_JOto4Q
<br />_"'ealB'th,,n40
<br />'"
<br />~ -:\
<br />'1'~ '...4
<br />\..
<br />
<br />
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<br />
<br />0204Q611~~~-
<br />,
<br />o 204a~ '.:lOt.'ETE'lS
<br />
<br />Figure 2. Average annual
<br />preCipitation (1951--80) In the UCOL
<br />(Colorado Climate Center, 1984).
<br />
<br />during tht' winter \ Itg. J l. The
<br />primary dal;I-l,.'l)lleclioll pcrioJ for
<br />the L'COI. ...tudy was water )t'ars
<br />] I}I)fl-YX. Slre:lmtlow Juring W;llCf
<br />~t'ar... 191.)h-47 wa~ at.o\'e aVt''ragt''
<br />fllf Illlbl (If the tlaslIl. 'slre;uufluv.
<br />dunng waler year 1993 wa... about
<br />;L\'I,'ragl.".lligh :o.tn:amllow... will
<br />dilute llW1Y \\:ller-quality constitu-
<br />1:'111..., n:sulting in lower concenlra-
<br />lion.... Su:-pt.'ndL"d ,eJimt'nl and
<br />r.:on...titut'lHs associated with 'l.J].
<br />menl lTIa) han' larger CllllL'elllra-
<br />11011'0 during f'll,'rioJs ()f high lhm
<br />than during hl\V lhm-.
<br />
<br />Irrigation is the Principal
<br />Water Use Within the UeOl
<br />
<br />Irrigatlnn al.'('(lunh f(1r 97 pcr~
<br />cenl (If Illl' walcr u~e 1Il the liCOL
<br />{tig, ..:). ~lnctY-OIne percent of thl.'
<br />walcr med mlhc Study Unit I"
<br />dai\ed frolll.,urfal'C'-water snurl'C.,
<br />{U.S. Ge'ologkal SurH'~. ]\N:'iJ.
<br />Ground water aCC{lum~ for I per-
<br />('em of walcr l1'>l' and h an nnpllr-
<br />(<.lnt rl'~(lllrl'e In rl'nlLltl' and rural
<br />area~ where the \\ ah.'r i., u.,C'd pri-
<br />marily 1\lr dOlllestk purrhhes,
<br />Walt'r di\el1ed east\\ ard from
<br />the llCOL. Ihn-"ugh transmollntain
<br />
<br />djn:r~ion". I~ used by man)' munic-
<br />jpahtie~ In the ea~tl.'m plaim of
<br />Colorado. Thi, diwrted water from
<br />the CCOL constitute" about 35 per-
<br />Cl.'n1 of the water supply for thl.' cil~
<br />of Dcmcr IDemer Water Depart-
<br />ment. 19Y9) and about OS pC'n:ent
<br />l)f the water ..upply f(lr Col(lrado
<br />Spring' ,S('olt Campbell. COlll-
<br />rad(l Spring'lo Water Ltllity. oral
<br />commun., ~UOOJ. In addition. the
<br />Color.ldo Big Thomp"on proJt'l,..t,
<br />using water divl'r1l'd from the
<br />UCD!.. pnwidc'l compll.'te or
<br />
<br />partial ..upply for more than 30 cit-
<br />ies and (OWI1' In northern Colorado
<br />(;..,'orthan Colorado Waler Con'ier-
<br />valley Di~trict, .:!(J(JO). Transmoun-
<br />tain diver,jon" can affect the water
<br />quality in the ba,ln becau:,;,e the
<br />din'rslllllS c:.In account for a sub-
<br />:,;,Iantlal portlOll of the local stream-
<br />th\\\ in up"tre3m area'i.ln addilion,
<br />the diverted water commClnly has
<br />lo\'- ..Jlinil~ thaI i., no longer avail-
<br />able 1\1 dilule mure minl'raliled
<br />water in the dll\\n~trl'am pan of (he
<br />Study Unit.
<br />
<br />lO.O'JO ['=' '...-ric-i'NtloilCiIritIt-*>,,197'OoOe
<br />'-~_1I-.1Icno
<br />!iO.O'JO. Flar9o1--..m.,rm:<.......lofho5l:orlolllda..19~
<br />
<br />· ,i
<br />M I Jt
<br />~N' '~~" \v'~J .~..__
<br />
<br /><0
<br />c'
<br />"0
<br />""
<br />,"
<br />,"
<br />""
<br />."
<br />""
<br />""
<br />."
<br /><"
<br />""
<br />,"
<br />,.
<br />"0
<br />."
<br />o.
<br />
<br />50,000
<br />
<br />II
<br />
<br />~ooo
<br />
<br />~,OOO
<br />20,000
<br />
<br />10.000
<br />
<br />Coloo:1IdoP~IISliteUle
<br />
<br />.
<br />Oct Jan Aor J'-lly Oct Jan Apt J..I~ Ocl JlIn Apt July OCI
<br />WATER YEAR 1996 WATERVEAR 1997 WATER YEAR 15198
<br />
<br />Figure 3. Streamllows in the UCOL were above average In water
<br />years 1996 and 1997, Water year 1998 streamflow was near
<br />average.
<br />
<br />>- 3.Boo '.., . '00
<br />, .
<br />0 . Surface....lIler
<br />" ""
<br />"" .:1 Ground water '"
<br />"" I 0<
<br />~~ (38) Wl1.I1lnbasinpopulalion$ttl'\lf'd. "<
<br /><0 .- "'
<br />80 0"
<br />"" .0
<br />0" !2MlI ,
<br />z< 0"
<br />"0 " I ,=
<br />~"-- ,<
<br />.0 . ""
<br />"" " 0 .~ S U~
<br />"Z 0 It'ti>- "<
<br />< ' " $;:;: ~<
<br />~~ w '>:""'I!. . "
<br /> , B~ ., ~ ~
<br />, 20 " 00
<br /> ~~ w
<br /> 0 ""
<br />-
<br /> 0 .
<br /> ESTIMATED ""''''TER WIlHDRAWJ\l.S I'" 15195
<br />
<br />Figure 4. Waler use in the basin is pnmanJy derived from surface water:
<br />however. ground water is used for some domestic and public water
<br />supplies. Transmountain diverSions 10 easlern Colorado Irom the UCOL
<br />accounted for about 451 million gallons per day In 19951Upper Colorado
<br />River CommiSSion. 1999),
<br />
<br />~ "'ater QualilY In Ihe l 'pf't'r C(ll\)raJI1 River Ba-:.in
<br />
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