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c.::) ..': .. '-. " -~) /..... ~ ..... ~ and Kansas. It is a publio improvement conoerning which there are nO repay- ment obligations, ei.ther for flood control or irrigation, on the part of lo- cal beneficiaries in either State, and in whioh there can be no private rights. Subsequent to authorization its official name was changed to the "John l1e.rtin Reservoir Project", which includes Caddoa dam and reservoir. 2. Tributary to the stretch of river between Caddoa and the State line there are 6.448 square miles of catclwmt or drainage area, whioh is about one-fourth of the total area drained by the Arkansas River and its tributar- ies in Colorado. Adjoining said channel about 120,000 aores of land are commonly irrigated. about half by diversions frcm the river above Caddoa. and half by diversions in Water District 67 downstream. Tributary runoff and return flows entering the river below Caddoa cal'not be oontrolled, regu- lated or oonserved by the Caddo a project. And. since a lnrge share of such contributions and accretions below Caddoa enter the river below Lamar, and hence below the diversion works of the major canals in Water District 67. they are subj eot to only minor depletions in Colorado. and c onsti tute a supply of water available to Kansas that is largely unavailable to Colorado. 3. To provide for the authorized dual-purposes of (1) flood control and (2) irrigation, the storage space in Caddoa Reservoir as Caddoa dam is now construoted, and as it may later be enlarged by the installation of flood-oontrol gates e.t the orest of the oonstructed concrete spillway. is segregated into an upper flOOd-pool and a lower irrigation pool. (1) The flOOd-pool will funotion only at times of major floods after the irrigation pool is filled, e.nd will be operated by or under the direction of the Corps of Engineers, to reduce damages from floods originat- ing above Caddoa to lands and property along and adjoin;i.ng the river chan- nel dowastree.m in ColoradO and Kansas. Average annual flood control bene- fits to the owners .of such la1\ds and property will aocrue in the proportionsl Z7% to ColoradO and 73% to Kansas (H. D. 308, 74th Congress, 1st Session; Vol. I, Table 53, page 498). Notel The plan of operation and administra- tion herein defined relates solely to the irrigation pool, and will not in- terfere with operations of the flood pool by or under the direction of the Corp s of Enginee r s . (2) The irrigation pool is dedicated to irrigation uses, to be operated for the purposes of (a) streamflow regulation and (b) ,,,,ter con- servation. for the benefit of water users and irrigation interests along the Arkansas River downstream in Colorado and lCansas and upstream in Colo- rado. 4. Regulation of streamflow involves previously used or appropriated v.e.ter supplies. and creates benefits by impounding the flows which formerly were diverted downstream, when and as availab Ie from the unre gula ted river, and later releasing the impounded waters more nearly when and as needed by lands and crops. Suoh regulation benefits wi 11 necessarily accrue most largely to those ditches nearest Caddo.. whose diverted supplies are most largely subjeot to regulation by Caddo.. Reservoir. However, some regula- tion benefits wi 11 also acorue to ditches further domstree.m in Colorado and Kansas. But because their diversions include larger proportions, and at times consist wholly, of tributary inflows, return flows and accretions (2)