|
<br />Projected Plan of Operation-
<br />Water Year 1984
<br />
<br />1I.1f~'- ',-,~,,~~,','I.,
<br />\:',~~ ~
<br />,,\ . "i':."-}v ~--..~.
<br />" ' "'(.... ";~""",-7 0- ,~,:'_
<br />,_i~ \;i ',:~-- ~(f,.~;};i1-;-
<br />~, \':,\"
<br />"/' ,';:: :~.
<br />,.,~"
<br />
<br />
<br />,>,','J
<br />. ,,'!',
<br />,'.'{\ '~'i
<br />
<br />1'-i:;.":L, ,,0
<br />
<br />CI..nll1g ad.y'! catCh.
<br />
<br />A proposed operaUon plan for weter yeer 1984
<br />for the Colorado RIver reservoir system was
<br />formulated and distributed to representatives
<br />of the Colorado River Besln Stelesln OClober
<br />1983. The plan was prepared 11'1 accordance
<br />with Ihe Operstlng Criteria published Juna 4,
<br />1970,In compliance with Section 602, Public
<br />Law go-537. The plan r.l\ecl. operation lor
<br />flood control I domestic and Irrlg8tlon u~e of
<br />water. hydroelectric power ~e.nefat~O{\ I water
<br />quality control, fish snd wildlife propagation,
<br />rec.reatll3t\, and Co\orado River Compact
<br />requirements.
<br />
<br />The plan was based on Ihe need to draw tha
<br />reservoir system down after the high runoff
<br />experienced In water year 1963 to facilitate
<br />repairs to the Glen Canyon Csm spillways and
<br />to other flood damaged facilities. Large
<br />re1S8!88 are expected to contlnUB from the
<br />reservoirs through atleesl Msrch 1 g84. These
<br />relesses are necessary In order to reach a level
<br />of system storage space by April 1 , 1984, that
<br />would enable the aystem to handle a heavy
<br />runott volume wlthoul requiring spillway
<br />nows at Glsn Canyon Cam snd without
<br />-equlrlng damaging 1I00d rele..."" from
<br />-{cover, Davia and Parker Dams. Releasesln
<br />he period from AprIl \hrough July will be
<br />lased on forecasted runoff conditions but will
<br />sault In greater a'laUab.l.e 6p,a.ce on August 1,
<br />984, than the minimum flood control
<br />aqulrement of 1.5 million acre-feet.
<br />
<br />The plan calls for 8 minimum objective rele8s8
<br />trom Lake Powell of 11.6 mllllcn acre-feet
<br />under lower quartile Inflow conditions. Under
<br />average to upper decile Inflow conditions, the
<br />scheduled relesses from Lake Powell are
<br />projected to range trom H.6to 18.4 million
<br />acre-feet.
<br />
<br />The projected operation for average runoff
<br />conditions for each reservoir In the Colorado
<br />River BasIn for water year 1984 Is described In
<br />the follcwlng pages. Charts 1-8 show the
<br />projected monthly outflows from et\ch
<br />reservoir for five assumed hydrologic
<br />conditions. Each condition reflected the most
<br />current hydrologic Information available by
<br />InCluding sctual forecasted Oclober and
<br />November 1983 Inflows. Inflowa for the
<br />remainder of 1he year were bas8d on the
<br />following assumptions of 1984 modified runoff
<br />from the basin: (1) sverage based on the
<br />1906-1g81 record of runoff; (2) upper quartile
<br />based on the annuallevet of streamflow which
<br />has been exceeded 25 percent Of the time
<br />durIng 1900-1981; (3) upper decile baeed on
<br />the annual level of streamflow which has been
<br />e.ceededlll percent of the time during
<br />1906-1961; (4) lower quartile based on flows
<br />exceeded 75 percent of the time during
<br />1906-1961; and (5) most adverse based on the
<br />lowest year of record, which wss1977.
<br />
<br />
<br />,i
<br />!
<br />
<br />,.'
<br />
<br />t,'if:,,:.'l<:_,
<br />StringIng ecl.ulpment for transmIssion rtr'l8.
<br />
<br />5
<br />
|