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<br />I <br /> <br />I <br />I <br /> <br />Supplementary Report <br />Page Two <br /> <br />I <br /> <br />On Weir Gulch, four reservoirs or flood storage areas were <br />found to have a substantial effect on the IOO-year storm <br />runoff within the basin. In the upper reaches of the basin <br />are Main Reservoir and East Reservoir, owned and operated <br />by the Agricultural Ditch Company. It was assumed, that <br />because of the present irrigation use and regular maintenance, <br />as well as resulting flood control effects, these reservoirs <br />could be considered perpetual. Downstream of these reservoirs <br />is Kountz Lake near Wadsworth Boulevard, which presently has <br />an effect on the flood magnitude in Weir Gulch. Kountz Lake <br />is an off-channel storage facility. The fourth area along <br />Weir Gulch, where storage and flood routing has an effect, is <br />at Wadsworth Boulevard. Because of the roadfill and the <br />existing culvert configuration, a flood routing effect exists. <br />This effect will be maintained as the area upstream of the <br />roadfill and is within the Belmar Park area, presently owned <br />by the City of Lakewood. In addition, the importance of <br />Wadsworth Boulevard as a main traffic artery is well recog- <br />nized. Therefore. the effect of all four water storage areas <br />was considered in the development of the flood flows used to <br />delineate the flood hazard areas on Weir Gulch. <br /> <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />On Sanderson Gulch, upstream of Sheridan Boulevard, six <br />reservoirs have an effect on the flood flow magnitude along <br />the gulch. At the upstream end of the gulch are Smith and <br />Kendrick Reservoirs. These reservoirs were originally irri- <br />gation reservoirs with Smith Reservoir still utilized by the <br />Agricultural Ditch Company. These reservoirs are among the <br />oldest in the State and will undoubtedly continue to function <br />in their historic manner. Downstream of Kendrick Reservoir <br />at Jewell Avenue is the Jewell Park Pond. This pond has a <br />negligible effect on detaining the IOO-year runoff hydrograph <br />The next downstream reservoir is the Green Gables Golf Course <br />entrance road which is an "unintentional" reservoir. The <br />routing effect results from the substantial roadfill coupled <br />with the small outlet pipes. This "unintentional" pond has <br />a major effect on the downstream flood flows. Downstream of <br />this location are Clairfield and Bit-a-Sea Reservoirs. Un- <br />der present conditions, these reservoirs have a minor effect <br />on the IOO-year flood flow hydrograph and would surely be <br />overtopped in the event of a major storm. <br /> <br />I <br />I <br />I <br /> <br />The latter three reservoirs are all under private ownership <br />and do not have a particular prescribed use requiring con- <br />tinued maintenance and perpetuation of the facility. For <br />this reason, it is felt the flood hazard areas along Sander- <br />son Gulch below these facilities should be defined to reflect <br />the condition of the reservoir embankments being breeched or <br />totally removed. <br />