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. ..~ ....-. ,..., , ~_.~ ~ ~ I- -...t substantial floods oc cur, .with t he reservoir empty, Caddoa dam may interfere with streamflow conditions, But since it will do so only through impound- ing water, any disturbance of previous interstate diversion relations re- sulting therefrom can be remedied when later the impounded flood waters are re lee. sed. 12. !<hen v.e.ter is impounded in Caddoa Reservv~r the regimen of the downstreem river lull be altered, and those oonditions which govern diver- sion opportunities and operations will be changed. Suoh changes will dis- turb the established relationsl (a) between the individual appropriators downstream in Water District 67; (b) between that group and others upstream in Water Distriots 14 and 17; fUld (0) between the water users in the two States. To prevent suoh changes, resulting from the oonstruction and oper- ation of Caddoa Reservoir, from benefiting one ditch. or one group of v.ater users. or one state, to the injury of another, it becones necessary to ae- fine the relations that prevailed prior to the Caddoa project, with respect to the usable water supplies of the Arkansas River, and to provide against material or injurious disturbances of such established pre-Ceddoa relations. 13. When water is impounded in Caddoa Reservoir the decreed priority rights of ditches in Water District 67 are rendered ineffective as against those upstream. and will not serve to apportion among the individual ditches of Water District 67 the streamflow of. the district, nor serve to prevent interceptions of impounded waters released for delivery at the Stateline. Hence, in any plan for operating Caddoa Reservoir, a substitute program for the administration of water rights in District 67 becomes necessary. Any substitute administrative program must, of oourse, be acceptable to the owners of said rights. for no different arrangement can be imposed without their consent. Under the pInn of operation and administration herein de- fined, the appropriators in Water District 67 are undertaking;. by agreement among themselves a!ld with other Colorado appropriators and State officials, to investigate the effects Ofl (1) limiting the total diversions in Uater District 67 in an average year to substantially the total quantities divert- ed in the average year of the pre-Caddoa period; and (2) dividing t he said total diversions among the individual ditches of Water District 67 in ac- cordanoe with average historic ratios, or such oth'.l' percent relations as may be agreed upon in lieu thereof. 14. For purposes of defining the pre-Caddoa interstate relations, with respect to the usable water supplies of the Arkansas River, it is nec- essary to determinel (1) the aggregate diversions from the Arkansas River, exclusive of supplies imported from other stream systems, of all irrigat- ing ditches in Water Districts 14, 17 and 67 in ColoradO, including diver- sions both for direct application to lands and for storage purposes; and (2) the divertible and usable State line flows entering Kansas, during the same period. .An attached tabulation shows the said aggregate Colorado di- versions (each month, season and year of the period 1908-1942) to have varied from 423,200 to 1.204,300, and to have averaged 857,200 A.F. annual- ly. Names of the Colorado ditches are shol'll in a footnote on said tabula- tion. They include all ditches located along and diverting from the Arkan- sas River in Water Districts 17 and 67; and all in Water District 14, ex. ceptl (a) the ditches supplying the Ci ty of pueblo. which are excluded because their diversions are for municipal purposes a.nd do not reflect (5)