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1936 -. Chapter III.--Sediment control by potential project The waters of the Colorado River have not been allocated by agree- ment emoung the Upper Basin States. For that reason the potential Gunni- son Arkansas Project has been designed to fit within two possible alloca- tions of Colorado River water. Essentially, two cumulative plans or phases have been formulated which are: (1) a minimum plan called the "Initial Development" and (2) an expansion of that plan known as the "Maximum Gravity Diversion". The Ini tial Development involves onlY the minimum diversion of water from~e Oolorado River Basin to the Arkansas River Basin consistent with economic develop~ent. It could readily be expanded into the Maximum Gravity Diversion. Each plan is self_suffi- cient and not dependent upon subsequent construction. Each plan pro- vides for the maximum beneficial utilization of water that is assumed divertible under the Upper States Compact end under Colorado State lawS. Each plan is susceptible to a certain degree of stage development. It is anticipated th~t the Maximum Gravity Diversion would not be con- structed in the near future. _ ': ~ --: , The -d.i vel'S ion ,!or:';'the;iiliti'al,=Developoeiit -i ~. -~5ns1ctered -tc6fe';tieii-' :- ,- ~ ,~ih~n' th~- pfo b~~re1:l:r.iits=of..::tlie__O~,!orad'o:~ly~r~C~p~ct~--Fc'l-r=that===- --, ':-"_ reas,o.:ri_the~eI!.giheeri!i'g~~fi'd'-ecoIloriic=:f'ep.si'bi'U,t1:e~~of-_,t~e~I!l~t!~r:Develo~"o. :--:ment'-hSve=1ieen~det erm:ined-:-:in_oiil:eEthaLCOns,t1'uctl'on-i:i1'ghto,begtn"at;:an-:-~ ~- ..:., early-date; '----'::-~ _ =-:---- --=--:-':'--:-:.'c __ ' --==--=,',_~ ',__ - ,-' n_, ' ", ------ ---- .1 However. detailed investigations, including firm designs and eeti- matee, for a determination of feasibility for the Maximum Gravity , Diversion have not yet been undertaken and only the general plan is pre- sented herein. As no new reservoirs would be constructed on the Eastern Slope under the Maxim~~ Gravity Diversion, the sediment control provided in that phase would be the same as that in the Initial Develop~ oent. Adequate space for sediment retention would be provided in all project reservoirs. As strea~s which flow into potential reservoirs on the Western Slope and in the headwe,ters of the Arkensae River carl')" only a small aQount of sediment, deposition of sediment in theee reservoirs would be negligible. However, heavy contributione of sediment would be made to the potential Pueblo Reservoir by the Arkansas River. None of the strep.ms in the Arkansas Valley in Colorado ie cap"ble of producing any considerable ~.mount of debris. -."'------,- r -- --- - - 12