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':'> "', '. J ......,,, ~ ~ ;.... <Xl variations in supplies available for irri@ation, and, being largely non-con- sumptive. are in fact included in the totals when the return flows arc re- diverted by downstreo.m irrigation ditches; and (b) the Collier ditch, ...dch is excluded because its record is incomplete and its diversions, largely of drainage interceptions, are minor in total a11lOunt. The said total diver- sions w.,re compiled largely from daily repor'!;s of the Division Engineer of Irrigation Division No.2, issued in cooperation with the Arh:ansas Valley Ditch Assooiation. Surface runoff and drainage vaters intercepted by some ditches below their official measuring flumes y.,ere dis!'egarded. Haters eli- verted from but returned to the river via sand-gate" and sluioeways located above the irrigated lands were not included, but regulation returns via lower reaches of the canals were included in said total diversions. Those diversions by the Colorado and Holbrook Canals, involving reservoir-to- river exchanges, were excluded to avoid duplication, - such volumes having previously been recorded when originally diverted into storage. Imported vaters wore excluded. to the end that Kansas _y not share in the reoently increased or proposed greater future importations. 15. Total stateline flows consist of and are measured as the sum ofl (1) Arkansas River at Holly; (2) Hild Horse Creek at Holly; (3) fully drain near State line; and (4) Cheyenne Creek near Stateline. During 1903-1942. the total Stateline flows including floods varied from 30.900 to 1,341,300, and averaged 278,600 A.F. annually. Exclusive of flows at undivertible rates (in excess of 2,000 second-feet in summer months April to September inclusive, and in excess of 800 second feet in winter months October to tlarch inclusive), and exclusive 01' volumes considered unusable (in excess of ;;0,000 A.F. in ane sUllllller month, or in excess of 120,000 Ad". in one summer Season of six months; and in excess of 10,000 A.F. in one winter month, or in excess of 40.000 A.F. in one winter season of six months), the divertible and usable Stateline flows entering Kansas during 1908-1942, as ShOWl by months, seasons and yeal's in a second attached tabulation. varied from 30,900 to 160,000, and averaged 106,200 A.F. annually. Notel Of the total State line flow including floods, the foregoing definition cIassifies 172,400 A.F., or 62% thereof, as undivertible and un- usable, e.nd 106,200 A.F., or 38). thereof, as divertible and usable. 16. Average pre-Caddoa interstate relations may be expressed as 12.4% - that being the ratio between the usable Stateline f'ows entering Kansas and the total diversions in Hater Districts 14. 17 and 67 in Colorado, during the average year of the 1908-1942 period. l1anifestly, a greater percent figure would result froml (a) reduoing the Colorado diversion figure by exc luding therefrom the diversions of return flow and storage waters; or (b) inoreas. ing the divertible and usable Stateline flow figure by increasing the limi- tations imposed by definition; or (c) both in combination. Notel Considered by years. the. said pre-Caudoa interstate relation, averaging 12.4%. varied from 5.7% in 1918 to 18.9% in 1925. As an average for three consecutive years, it varied from 7.1% during 1916-1918. to 15.7% during 1923-1925. By five-year averages the ratios war'", 12.2% during 1908- 1912; 10.5% during 1913-1917; 11.7% during 1918-1922; 14.2;10 during 1923-1927; 11.2% during 1928-1932; 14.7% during 1933-1937; and 11.2'10 during 1938-1942. During 1908-1917, the first 10 years of the pre-Caddoa period, the relation averaged 11.35%, and during 1933-1942, the last 10 years of the period, it was 12.99%. (6)