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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 />L.ower Big Dry Creek Hydrologic Study <br /> <br />EXECUTIVE SUMMARY <br /> <br />Since the Big Dry Cre(lk Watershed Association (BDCW A) began meeting in 1997, landowners <br />in the lower portion of the watershed in Weld and Adams Counties have raised concerns about <br />increased erosion, higher flows in the creek and more frequent flooding along Big Dry Creek. <br />The storm events during the summer of 2004 heightened these concerns regarding current and <br />future flow conditions. As a result, the BDCW A has sponsored this study to answer questions <br />regarding Big Dry Creek's current and expected future hydrology and to identify potential <br />solutions to landowner problems. Funding for this study has been provided to the BDCW A from <br />the Colorado Water CDnservation Board, the cities of Broomfield, Westminster and Thornton <br />and Weld County. <br /> <br />This report summarizes the findings of the study, addressing the following topics: <br /> <br />. Changes in Big Dry Creek hydrology over time. <br /> <br />. Future expected. changes in Big Dry Creek hydrology. <br /> <br />. The role of base: flows in Big Dry Creek hydrology. <br /> <br />. Expected changes in base flows in the future. <br /> <br />. Stormwater management strategies in place in the upstream cities. <br /> <br />. Stormwater management strategies used in other Colorado communities and other parts <br />of the country. <br /> <br />. Strategies for stormwater management in Big Dry Creek. <br /> <br />. Approaches that can be used to mitigate existing problems along lower Big Dry Creek. <br /> <br />· Recommendations for future activities with regard to Big Dry Creek. <br /> <br />971-179.092 <br />June 2005 <br /> <br />Wright Water Engineers, Inc. <br /> <br />Page 1 <br />