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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />.i, . f, ! :-~ 'I <br /> <br />Why Have DivisionaZ CaZZ Patte~ns Changed? <br /> <br /> <br />Divisional call patterns have ~ changed due to changes in <br /> <br /> <br />climatic conditions. Changes in climatic conditions between the <br /> <br /> <br />1941-1963 and the 1964-l981 periods are not evident. <br /> <br /> <br />It appears to the author that divisional calls have <br /> <br /> <br />decreased in severity due to the increasingly significant intro- <br /> <br /> <br />duction of transmountain diversions and consumptive use transfer$ <br /> <br /> <br />of water from south park to the Metropolitan Denver area. <br /> <br /> <br />One cannot attribute the change in calls solely to impor- <br /> <br /> <br />tations of transmountain waters from the Roberts Tunnel. While <br /> <br /> <br />the Roberts Tunnel importations contributed some 50,000 acre-fee,t <br /> <br /> <br />per year to the South platte River Basin, the other .Metro <br /> <br /> <br />Contributions. increased in the 1964-l98l period by almost 25,OOp <br /> <br /> <br />acre-feet annually over the earlier period. <br /> <br />SOME ADDIfIONAL QUESTIONS <br /> <br /> <br />Based on the demonstrated capabilities of computer analysis, <br /> <br /> <br />of river call data by the program STAPRI and the other programs <br /> <br /> <br />described in the Appendix, answers to many of the following <br /> <br /> <br />questions may be obtained. <br /> <br /> <br />o Are the .new. call patterns likely to endure? <br /> <br /> <br />o IS the pronounced shift in call patterns in the late- <br /> <br /> <br />irrigation season months of september and October due to <br /> <br /> <br />d~layed return flow from urban lawn and landscape <br /> <br /> <br />iorrigation? <br /> <br /> <br />o I'S there now water, ~, new water, available for <br /> <br /> <br />a~propriation and diversion directly from the South <br /> <br /> <br />~latte River downstream from the Metropolitan Denver <br /> <br />-19- <br /> <br />.'0.,;\;:",.;. <br /> <br />" .~ <br /> <br />i; <br /> <br />,~ <br /> <br />.,,-' <br /> <br />~i,l <br />~~ <br /> <br /> <br /> <br /> <br />/: <br /> <br /> <br />