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I I I ,1":'_ -, ~, ~ ~ , :) _ ,-.'7.\ tention ina direct manner, as well as shedding light on the other two contentions. This report addresses the following questions: o Has there indeed been a change in the river call patterns!? o Is the change in call patterns (if any is found) related to the importation of water by the Harold D. Roberts I I I I I I I I I I I I I I I I Tunnel in the South platte River Basin? o IS the change in call patterns (if any is found) related to the transfers and changes of use of the numerous water rights in South Park which were formerly used for agri- cultural purposes? The~e E~i8t8 A Diffe~ence in CaZZ Patte~n8 Bet~een 1941-1963 and 1964-1981 STAPRI provided a quick and complete frequency analysis of divisional calls upon Water Distrit 8 for the period 1941-1963 and the period 1964-l98l, the pre-Roberts Tunnel and the post-Roberts Tunnel periods, respectively. Water District 8 was chosen for analysis, because it is upstream of the water rights in District 1 and District 2 which are presumably benefited by the importation of water through the Harold D. Roberts Tunnel by the Denver Water Board. Figures 1-1 through l-12 graphically depict the relation of frequency of calls between the 1941-1963 and the 1964-198l study periods for Water District 8. These figures co~lectively reveal one phenomenon which the contender of the third hypothesis would quickly believe: during the irriga- tion season, the severity of calls against the Metropolitan Denver wat~r users has noticeably decreased. For instance, a January 1, 1880, water right in District 8 has been in priority -2- 1:. i _,~____~_~----'-'--'=----_~_, o'-.._-""-__.~L ~=_~~-,,__ '~"'_"~~- ;1 'J ,+ ::~, 1 ~ T , 1 ;~ '~'