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WSP07106
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Last modified
1/26/2010 2:25:46 PM
Creation date
10/12/2006 2:05:46 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.101.17
Description
Glen Canyon Dam/Lake Powell
State
AZ
Basin
Colorado Mainstem
Date
9/1/1998
Author
Schmidt/et al.
Title
Science and Values in River Restoration in the Grand Canyon
Water Supply Pro - Doc Type
Report/Study
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<br /> <br />performance of the utllluri.an t.asks <br />of power produ..:tion and water trans- <br />fer; ecologic.11 integrity is a second- <br />an" value, <br />. CJrothers and Brown (1991) ar- <br />gueJ that the appropri.lte dIrection <br />for ri\"er mana~ement in the Gr;lnd <br />Canyon is to preserve the present <br />pro":t'sses and elemeJl[~ of the ri\"er <br />.b a 1/.Hllr.Jlt::.ed er::os\'stem WIth "a <br />blend of the old and the new. a mix. <br />ture at nam'e and introduced organ- <br />Isms and natural and artificial pro- <br />..:es..es""' ;-\on-nati\"e spe":les wITh <br />e..:onomlc value. or th:H .ue perm a- <br /> <br />nemly established and not a threat to <br />[he sun'ival at native spe..:ies. are <br />managed by minor alterations of d3m <br />releases. such as restrIcting the ran~c <br />of houri\" flow fluctuations and cre- <br />ating sn~all floods th.tt exceed the <br />magnituJeot averagedaily maximum <br />flows. These techniques necessitate <br />restructuring. but nor eliminating. <br />load-following power production. <br />. The :-\ational Research Council <br />(~RC 1996) proposed using ~opera- <br />tlonal tlcxlbilm' to restore .Ind main- <br />tolln ennronme'O[;]I.;-ondltions,""rhat <br />resemble a,. ne.J.dy as possible the <br /> <br />-42 <br /> <br />I-"i~ure 5. Up~tream views of the Colorado <br />River near Cardenas Creek (Figure I), <br />(toplln a photograph taken on January <br />23, 1890. lm!e riparian \"egetatlon is <br />present alon~ the nver except for scattered <br />mesquite and wh.lt appear to Ix scattered <br />dumpsof .....dlows. A large ~andbaroccurs <br />on [he downstream side of the Cardenas <br />Creek debris i.ln. III the left pan of the <br />center of the flj:ure. Fanher downstream. <br />in the leit panof the figure, an eddy occurs <br />in the lee ot thIS debns ian. Photo: Raben <br />B, Stamon: courtes~" of the Sational Ar- <br />chi\'es. (bottom) In a photograph taken on <br />February 16. 1993. the IncreJSe In npar- <br />Ian vegetaWJIl isextenslve,.lnd a smaller <br />new sandbar IS located wlthm the tor mer <br />edd~'. \lost \"egelatlOn is saltcedar. al- <br />though willow, arrowweed. and other <br />nau\'e spccll~'shave also Illcreased" Vegeta~ <br />tlon on the new s.!nJbar includes dry and <br />wet nparian marsh speCies, .lod the area is <br />a nest 109 habitat tor end.lllgered somh- <br />western willow t1\'cat,hefS" Photo; Steve <br />Tharnstrom; cour~esr of the US Geologi- <br />cal Survev Desen Laboraton' Collection" <br />Photoj:raphs repnmed trom i'ebb (1996). <br /> <br />original condition of the fiver." We <br />term this the simul.lted I1Jtllr,1I eco- <br />s)'stem 3pproach. ~RC (1996) also <br />suggested that the status of un- <br />vegetated sandh.lfs ;]nd end.lngered <br />fish habiuts should be the primary <br />measures used to evaluate [he suc- <br />cess of thIS approach. Op~'r;)tion;)l <br />changes under this Strategy include <br />dam releases that doseh' resemble <br />the pre~d;lm h}'drogr'lph~ including <br />frequent floods that greatly exceed <br />[he ma~nitude of avera~e daily maxi- <br />mum tlows. Load-followlIlg power <br />production would be substantially con- <br />trolled and would var)" seasonAlly, <br />. The fourth mAnagement ;lpproach, <br />sltbst.Jnti.J1 resfor.Jtion oj' 1l,lfurJ/ <br />processes. could be accomplished by <br />retrofittlng existing fa":llities or build- <br />109 new ones, The goal of this ap- <br />proach IS the restor.Hion of ;1 large <br />measure of pre-dam h~-drologic vari- <br />ability, includIng higher <;edlment- <br />transport rates and m-ore wide rang- <br />Ing thermal variability. The strueg}' <br />would invohe con~tructlng facilities <br />to transfer sedIment from the Colo- <br />rado Rl\"er de It.! or the San JUdn <br />River delta In L3kc Powell to the <br />Colorado River near Lees Ferrv and <br />huildlllg multilcvcllOr.lke stru~tures <br />to allow the release of water of differ- <br />ent temperatures when Lake Powell is <br />chermallv Hratliled. Con~trall1ts <br />would be' pla.:ed on power produe. <br /> <br />( <br /> <br />BIOSOnfa \'0/. 48 .\:0. 9 <br />
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