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<br />i'l, ,f r;, q"!.l <br />'1) 'v: ,j " .. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />H;y'drology <br /> <br />Water rights are administered under the authority of the State <br />Engineer by division engineers and water commissioners who apportion <br />the waters of the stream to the appropriators in order of priority <br />until the supply is exhausted or until all demands are met. <br /> <br />The State is divided geographically into seven divisions. <br />These divisions are further subdivided into districts, the adminis- <br />tration of which is charged to a water commissioner who is respon- <br />sible to the division engineer. <br /> <br />The St. Vrain Creek basin is composed of Water Districts <br />Nos. 5 and 6 of Division 1. Data on historic diversions to ditches <br />and reservoirs in Water Districts Nos. 5 and 6 were obtained from <br />the Colorado State Engineer's office and the Lefthand Ditch Company. <br /> <br />Municipal and Industrial Water Utilization <br /> <br /> <br />There are 14 communities in the St. Vrain Creek basin ranging , <br />in population from nearly 38,000 persons in Boulder (includes University;; <br />of Colorado students) to 120 in Jamestown, as reported in the 1960 <br />population census. With the exception of some of the larger communi- ' <br />ties, very little is known about their historic use of water. Some <br />of the smaller communities share canal and reservoir facilities with <br />agricultural users. Allocation and delivery of water in these systems <br />are based on share ownership, but data on individual user water supply <br />cannot be obtained without detailed study beyond the scope of these <br />investigations. <br /> <br />Water is both exported from and imported into the basin for <br />municipal and industrial use. Boulder, Longmont, Mead, and the <br />Great Western Sugar Company's facility near Longmont have received <br />water imported by the Colorado-Big Thompson Project. Broomfield, <br />Denver, Thornton, and Westminster, which are outside the drainage <br />basin, divert water from South Boulder and Coal Creeks. The quantity <br />of municipal" and industrial water supply historically imported into <br />the basin is known. However, the quantity of water exported by <br />Broomfield, Thornton, and Westminster was not determined because <br />these communities use agricultural canal and storage facilities and <br />their water supply situation cannot be easily evaluated. Data on <br />exportations by Denver from South Boulder Creek are available but <br /> <br />16 <br /> <br />,j <br />