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<br />F.
<br />
<br />G.
<br />
<br />H.
<br />
<br />I&K,
<br />
<br />J&L,
<br />
<br />M,
<br />
<br />I'Hp70fl
<br />v '<.._ ..~ , ,J OJ
<br />
<br />TABLE 4 Footnotes
<br />"Explanation of Columns"
<br />
<br />A.
<br />B.
<br />
<br />River basin, name, row description.
<br />The average annual natural flow (undepleted, unregulated flow) between 1906 and 1985 from the tributary basins as"computed'by
<br />the U.S. Bureau 'of Reclamation. '
<br />The percent of natural flow which originates in each tributary basin. It is computed by dividing the tributary value in Column b
<br />by the s~ total at the bottom or end of column B,
<br />The maximum annual consumptive use reported by the U.s. Bureau of Reclamation in their consumptive uses and 'losses repo~
<br />between 19:-81 and 1985 and then adjusted up to account for maximum transmountain diversion which occurred in 1978 and more
<br />detailed Inrpnnation concerning M&I uses as reported by the U.S. Geologiual Swvey In 1985. The maximum adjusted
<br />consumptive use values were used to reflect the full extent of existing development which has occurred to date.
<br />The lower limit of futurO compact development was computed by taking the pen:ent of natuq1 flow (column C) times the
<br />remaining Undeveloped compact apportionment to reach the 3.079 million acre~foot level of compact development (3,079,125 ~
<br />2,628,700" 450,425 acre feet). This distributes the remaining compact apportionment on the basis of tile, percentage of natural
<br />flow origin~g in each the seven subbasin. This seemed equitable to the Workgroup and in cases like the Yampa seemed to be
<br />adequate to' BIlow for most foreseeable development over the next 4o-years or so. This also provided results which were fairly
<br />consistent WIth the resullS of the Yampa FeasibUity Study currently being perfonned by Hydrosphere for the Colorado River
<br />Water Con$ervation District and the ewCB. The state total of column (0) plus column (E) is 3.079,125 acre feet'or Colorado's
<br />lower limit~f compact development
<br />The upper ~imit of future development was comp~ to allow for flexibility and the most optimistic projection of future comp~
<br />developmeqt(3.855 mat). The upper limit was compated by allowing for one-half of the remaining compact apP,l'rtionment to
<br />reach the 3;079 mar level of compact development (225,213 acre feet) to occur in each basin except wherein so doing would
<br />exceed the ~vail~le water supply of the basin (note: this only occwred on the Uttle Snake and would not have occurred here . '
<br />either had ~ considered all the flow passing the Lily gauge approximately half of whlcl1 o~ in WyomIn8). Doing this, '
<br />also alloweil for ,lbe uncertainty In assumptions made concerning the "Law of the River" by providing for the totalC9nsumptlv~
<br />use of water to reach 3.855 mlllion acre feet The 'State Subtotals" of columns (0) plus (F) In this ease total 3.843,975 acre ~t
<br />or approxil\iately 3.855 mafwithoutlneludlng CRSP evaporation, The values In this ease could be adjusted to total exactly 3:~55
<br />maf If des~ but the Workgroup eleeted not to do so,
<br />The lower limit .ftotal consumption refleelS the I11lIllimum a<ljusted depletions In each basin to cIate plus the full utilization of
<br />projects allCady in1'lace as reflected on Colorado's current 'depiction schedule.' The curreot depletion sehedule was used as a
<br />cheek On tliepotentla1 validity of the values used. However, In nO ease was the value in column G permitted to be less than the
<br />total of col_D plus E. For the Colorado MaInstem, Dolores and San Juan Basins, the:values used aehtallyexceed lbes"",of
<br />column (0) plus(E) by 91.726; 10.813; and 10,148 .... feetresPeetlvely or 1I2,687af overaIlin order to refleet lbe full
<br />utilization qfprojects alread~ 1n1'1aee. By doing this we 8SS\!fC that we did notcomprom1se any exlsIing majorprojeets and yet
<br />still provide for Colorado's full use of its compact cntidemeIit in an equitable manner.
<br />The upper limit of total colI$umption was computed by adding the present day consumption (column D) to the upper limit of
<br />future develupment (column F). The only restriction was that column H had,to be greater than or equal to the lower limit
<br />(column G). For the Colorado Mainstem, it was necessary to raise the upper limit 16,787 afln order to make it equal to the lower
<br />limit Thut column H subtotals Slightly exceed 3,855 MAP even before CRSP evaporation is added In. '
<br />Given these values you can now compute the upper and lower limits of an instream flow appropriation. The upper limit is
<br />compured by subtracting column G from column B. This also becomes column K In the table and represenlS the total recovery
<br />instream appropriation. Please note this level of recovery instream flow does not contain any water that would be used to reaCh
<br />full compa4t development at approximately at 3.079 MAF level of development However. it does include the utilization of
<br />341,000 acie feet which would be lost to evaporation off the primary CRSPA storage units (Lake Powell, Flaming Gorge and
<br />Aspinall) "lid chluged to Colorado's apportionment.
<br />The lower ~imit instream flow appropriation is computed by subtracting column H from column B. This becomes column L ill ,the
<br />table and njprestnts one possible level of appropriation of paragraph 3 water. In this case it represents the volume of water wtlich
<br />must leave Colorado on average at full compact development in the basin. The value also includes the 341,000 acre feet which
<br />would go to meet Colorado's portion ofCRSP evaporation. which because it is not used in Colorado can be added to the ins~am
<br />flow appropriation.
<br />Column M 'is, the difference between columns I and J or alternatively, the difference between column K and column L. This
<br />represents Qne possible level of paragraph 4 water and can be described as the water that takes you from 3.079 MAF of
<br />developmeQt to at leaSt 3.855 MAF with a little cushion (346,,388 AF).
<br />
<br />C.
<br />
<br />D.
<br />
<br />E.
<br />
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