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Last modified
7/29/2009 8:16:25 AM
Creation date
10/9/2006 3:51:31 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8283.100
Description
Colorado River Basin-Colorado River Computer Models-Colorado River Simulation System Reclamation
State
CO
Water Division
5
Date
9/10/1985
Author
John Billings
Title
CR Colorado River Simulation System CRSS-Corres Reports etc-1984-1985-Virgin Flows and CRSS Natural Flows
Water Supply Pro - Doc Type
Report/Study
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<br />. <br /> 0028{9 . . <br />\) <br /> ( <br /> APP E N D I X .1>" W ^ T ~ !l SUPPLY <br /> ", <br /> <br />. CHAP'E..1i. IV - VIRGIN F!.O\'! - COLOR..l.1:C !lIV3:? A':i! T:,~ F3R..1.Y <br /> <br />To dotorcine the limits of the water available to sup~ly all upper <br />basin apportio~onts and meot do"~strea~ eocpact and treaty eocnitments, <br />it was neoessary to evaluate the virgin or undoplctod flow of the rivor <br />at the basin division point - Leo Ferry. <br /> <br />Tho flow of th~ rivor ?ricr to upstrc~ ~ovclc~oonts by m~~ is <br />ccnsidvTcd tho virgin or undoplotoc. flo'l'l. Tho historical flow at Loc <br />Ferry is given in Cr~pter II as the flew ef tho ?aria !liver at Leos <br />Forry added te the flow of the Colorado ?~ver at Loes Forry during thc <br />saroo pcriod. Since tho historical fle'.. reflocts the chango in tho <br />regiwen of tho river resulting from man-made de,letion. the virgin <br />flow for any poriod can be determinod by adding te the historical flow <br />the not depletions resultir~ frem upstreao man-made developmonts durir~ <br />tho SeJ:lC period. <br /> <br />Tho tabulation on the following page prosents by water years tho <br />csti~tcd ~irgi~ flow of the Colcraco ~ivor at Luo ~~rry durir~ tha <br />period 1356-1547, <br /> <br />Column 1 of this tabulation is a presentation of the ar~ual histor~ . <br />ieal flows derived in Chaptor II. <br /> <br />Col~ 2 ~rcso~ts tho cst~mat~d i=~i6atod aC=3ago for each yaar <br />d~ri~g tho poriod of study. T~oso aC=Gag~s wGro Gstimatod aftor consid- <br />eration of all availablo data :nclud:~g tne 3uToa~ cf Roclanation lane <br />classifice.::..on sur-loy of the 'basin (lS32-:3.33) t ?urca1:. of Cor.S'-:.s d..ata, <br />and da~a cssc~blod by tho ~~gi~~ori~g Ad~:sory Co~ittco. <br /> <br />Col~n 3 gives an adjustment fact:= ~ocossary to rofloct the a~~ual <br />"ta=-ia~ior.. f:-or:l the noreal '....ator S'1.ro"l'Jl:,' availablJ at sitos of 1':"50. In <br />years cf low ~~-cff the limited su~,ly a7ailablc fer storage, diversion <br />a=.:J. use :"oflocts a bolow-ncr=.al c.o~:;lct:cn to the strcar.lfl01:r at 1.00 Perry, <br />CC~7crsoly in yoars of hi&~ ru~-cff tee availa:ility of water i~ greater <br />auantitics at sitos of uscs ar.t tho cxtc~si~n c: the suu~ly throug~out <br />t~o irrigation season reflects an abovo-~c~a1 iCylotion- at Lee sorry. <br />Duo to tho lack of detailed dn~~, the ~oplotion in ench year uns ~ssumed <br />to vary frem the aVQrago ~~~~l ~c~1c~io~ in pro~crtion te ono-ha1f tho <br />variation of ~h0 virgin run-off .at Lee ?c=ry in the same yoar from tho <br />1914-1945 mean ar~al virgi~ r~n-off of the Colorado River at 100 ~~rry. <br /> <br />Cel~~ 4 prose~ts tho edj~stod unit rates 0: depletion for each year. <br />These rates woro Qct:~incd or ~~1ti,lyi~g thJ 1514-1945 ~aan an~ual ir- <br />rigation d0plctio~ rata by t~c atjustmcnt factor given in Calutin 3. ~hc <br />1914-1345 ~oan o:~~a1 irrigatio~ do~loticr. rate abovo 100 Ferry was <br />~ss~~od as tho 1914-1945 mc~~ ~~al ~~?~r basin dc,lction at l00 ~crry <br /> <br />. <br />~ <br />r <br />t. <br /> <br />49 <br />
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