|
<br />RESERVOIR
<br />OJ:JERATIONS
<br />
<br />TIll' HIl;~) SlloWIlWh rUlloff in 1I11' UPP1'f Colo-
<br />rado I{ivi'f Baslll for tl1l' .\prij.July Jwriod was
<br />ahout 8,1(;0,000 al'rp-fl't't, or ahout iH; pt'f-
<br />et'nl of lilt' long.tim,. .l\'t'ragt' fur thi.... period.
<br />Till' total runoff fot lhl' wall't Yt'ar {'ndin~
<br />Sl'ptt'mllt'f :W. 19li!J, was J].5 miJJion ant'-
<br />[1'1'1, whit'h is 9;l Ilt'rn'nt of normal. TIll' dis-
<br />position uf this total nUlOff will hI' about as
<br />follows:
<br />
<br />Nt'{ ~loragt' Ilh'fplISl.'
<br />Evaporation ilnd Bank
<br />Slorage
<br />Rt'Il'ases to LOWl'f Basin
<br />Total
<br />
<br />.\.,:re.fppl
<br />2.100,000
<br />
<br />tiOO,OOO
<br />H,800,000
<br />II.SOO.OOO
<br />
<br />s
<br />
<br />All of tilt' Upper H<.Lsin n'sl'rvoirs haw gainpU
<br />storagl' during watt't year 19m1 t'Xl't'pt Flam-
<br />ing Gorge and ~lorrow Point from whkh
<br />about 26-1,000 and 3(i,OOO aere.ft't't, l\'SIK.'c.
<br />tiVt'ly. has bt'l.'/1 movl'(l dOwllstn>am. During
<br />tilt' sanw 12.month period, l..akt' ;\It',l(j has
<br />gailwd about Ollt' million al'n'-fl'et of storagl'_
<br />
<br />Lakt' Powell's water surface rt'adwd an all-
<br />tinw high at :3581 fl'd t'lt'vation on July 21,
<br />1!)(i9, with a slora~w of 10,:190,000 LtcH'-ft'l't.
<br />During ils riM' il passt'd, on i\.lay:W, 1969. pit'-
<br />vat ion :1,570, or "ratl'd hpad," "Ratt'f..llH'ad"
<br />is tilt' lowl'st level at whi('h walpr flowing-
<br />through tht, turhilws ('an driV{' tlw gt'lwralors
<br />at t1wir nanwplatt' t'apat'itj'. The lakt' is I'X-
<br />pt'dt>d to rt'main nt'ar L'levaliun :1575 until
<br />tilt' spring runoff starts in J ~J7U.
<br />Ahollt 8.8 million ;It're.fl't,t of water must hI:'
<br />rt'll'<.ISt'd to tlw LOWN Basin durlllg walt'r y{'ar
<br />191i!J. For tll(> nt'xt thwp years, annual rp-
<br />leases should also bt' lwar this amount in
<br />urdt'r to delivt'r 75 million aere-fl,t't to t1w
<br />tOWN Basin in the HHi3-nJ72 di'eade Ita ful.
<br />fill a l'ompact eommitnwnt). This partieular
<br />10-y('<.U" Iwriod is eSI){'eiaJly critical bt'(.<liISl' of
<br />tlw smaJl wlt'aM's during thl' lirst two )'f'ars
<br />when we Wert.' at'quiring minimum pm\'l'r
<br />POOlli in Lake Powell and Flaming Gorge
<br />Hl'Sl'rvoir. The i'ntirl' fl'1t'i1st' will Ll' llSl>d to
<br />gl'nerau' powpr for pOWf'r customers in both
<br />tlU' Uppt'r and ulwpr Basins.
<br />TIlt' water surfal'e level of Flaming Gorgt'
<br />Ih':-;('rvoir on tht' Green Hivi'r has f{'l'l'(h"tl
<br />from its spasonal high at. I'll'vation 5!J!JO fept
<br />to its pres<'llt level of 5!I85 ft'pL. '1'111' April
<br />through July spring runoff abm't' llw ft'Sl'rvoir
<br />was ahout 1,27:1,000 ;u:rf'-fpt't, or 108 IwrcI'llt
<br />of normal. St'ht'duled power releast's should
<br />draw tilt' n'st'rvllir down lu abuut 5\J70 f{'l'l
<br />with a total t'onh'llt of 1,583.000 Hcre-fl't't by
<br />the timt' of spring runoff in 1970.
<br />"'ontl'lwlll' Hl'servoir in tlH' Upper part of tilt'
<br />Grt'l'n River, \Vyoming, is now at e1pvation
<br />
<br />
<br />11502 fpt'l afh'r filling parly in JUlll'. During
<br />tilt' coming winlt'r thl' t'lpvation will b{' drawn
<br />down to approximah'ly (jiI85. In future ypars
<br />the rt'st>rvoir will normally fillpaeh spring, pit..
<br />vatiOIl 650n fl>t,t, and hI' drawn down lo t'lt'-
<br />vation f).185 ff'('l latt' t'at'h winlt'r. Within this
<br />typP of (Jut'tuatio!l, all purposl's of tilt'
<br />Projt'l't will lip sl'rvl'd and minimulll amounts
<br />of waler wiIJ hypass tilt' Jlowt'r plant.
<br />
<br />Thl' watt'r Ipvf,1 of NavajO Ht'Sl'rvoir on lilt'
<br />San Juan HiVt'r ft'adlt>d an all.tinlt' high at
<br />60-15 fl'd I'll'vatioll on t\ugust n, HUi!), wIth a
<br />~urfan' storaw' of 1,IfH,OOO ;u"rt,.fpl't. T1\1'
<br />n'sl'rvoir should gradually n'n'e1l' tu f'h'va.
<br />tioll {iO:m ft'd by tilt' t'nd of NOVt'mtwr 1!lliH,
<br />and by tlw pnd of J\larl'h 1!170 it should 1Jt' at
<br />or ,1!JOVP t'h'Val]on ti010 f{-'pt, The snowl1wlt
<br />runoff abow Navajo Hps{'rvoir was ahout lOa
<br />pt:'f('t'nt of tilt' long-tinw aVt'r<lgt' and tilt' in-
<br />flow rt'adwd as high as (i,:lOO ('ubil' f('t't ppr
<br />Sl'l'()IJd during parly spring, Thpsl' high flows
<br />wt'n' rt'tlun'lJ Iwlow till' dam hy storag-t' in tht'
<br />n'wrvoir to ~,OOO l'uhic fl'pt ppr !>I'cond.
<br />
<br />"Iso on till' C:ullnilion Hiwr. Bltlp J\1t'sa Hl'St'r.
<br />voir f('adlt'd <111 all-lillii' high at 750H ft'pl t'1t'v.
<br />ation with a ('OIltt'nt of 72R,OOO acrt'-ft'l't.
<br />Bllw Mpsa will Ill' drawn tu ahout I'll'valion
<br />7.142 by Hii' 1'11<1 of ~larl'h HI70. It was nol
<br />1lI'l"t'ssary to makl' Sllt'dfie flood l'ontrul rt'-
<br />I('ast's sinn' t1w runoff ..hoVl' tht' n'sl'rvuir was
<br />ahout HH Iwn'pnt of normal and tht-' f('ll'as('s
<br />rl'yuin'f..l for normal pOWl'r olwration providpd
<br />('no ugh l'l1\pty liloragl' ~pal't' in till' rt'sprvolr
<br />for pOlt'l1tial flood flows.
<br />
<br />J\lorrow Point Ht'Sl'rvoir, whidl is locatt'd illl-
<br />llu"tlialt'ly dowlIstrpam from BIlll' J\1i'sa Dam,
<br />was fillt'd during" till' watl'r j"t'ar and occasion_
<br />al spills Wt'rt' IW{'pssary oW'r till' ,~p{'('ta('ular
<br />31;{).foot frt't' fall spillway. Spills art' n('t.t's~ary
<br />at Morrow Point bf'l'aust-' tl1t' powt'rplanl is
<br />not Yl't in operation,
<br />
|