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<br />SECTION X <br /> <br />SUMMARY AND CONCLUS IONS <br /> <br />The major dralnageway planning study or preliminary design for Big <br />Dry Creek is a part of the 1972 work p,'ogram of the Urban Drainage and <br />Flood Control District. The study was funded in conJunct.ion with the City <br />of Westminster, Adams County, and Jefferson County. <br /> <br />The Big Dry Creek draInage bas In is ffii9de up <br />sub-basins; the total area of the drainage basIn <br />elevations ranging from 5040 feet to 6S00 feet. <br />study allows for prevent ive measures ,"ather t.han <br />sary In other basins. <br /> <br />mostly of agricultural <br />is 86.3 square miles, with <br />The timeliness of the <br />correctIve measures neces- <br /> <br />The summary and conclusions are tabuiated below: <br /> <br />1. The study was broken I nto two phases. Dur i n~1 Phase A, the .a I ternat I ve <br />and design frequency were chosen for study in this Phase (Phase B). <br /> <br />2. The results of the IntensIve study of the chosen alt.ernative are pre- <br />sented in this two"volume report. <br /> <br />3. Volume One Is the narrative report" Volume 1'1,'0 contains a draInage <br />basin drawing and 21 drawings reduced to one"half scale from I" ~ 200' <br />and shows: <br /> <br />a. Proposed Improvements. <br /> <br />b. 100"year future flood pialn .. existing channel cClnditIons. <br /> <br />c. 100-year future flood plain -Improved ch.annel conditions. <br /> <br />4. It Is antIcipated that a large portIon of the predominantly agricultu- <br />ral basin will be urbanized by 1990. IBlg Dry Creoek offers" good <br />opportunity for wise flood-plain management. <br /> <br />5. During Ph.,se A a"non-structural" approalch and a IOO-year return fre- <br />quency were chosen. <br /> <br />6. The study area of the Big Dry Creek drainage basin is in Townships <br />I and 2 South, Ranges 67, 68, 69, and 70 West, of the 6th Principal <br />Meridian. <br /> <br />7. Due to the historically recent addition of Standley Lake and the Great <br />Western RElservoir, Big Dry Creek hi3S belcome " meandering, eroding <br />stream that Is still seeking to balance Its energy regime. <br /> <br />X'- J <br />