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February 21, 1978 Page 2 <br />Administrator Achen reported that again in June, 1977, heavy rains <br />caused flooding problems in Mounds View. As a result, on August 8, <br />1977, the City Council ordered a feasibility study on implementation <br />of the drainage plan for the entire city. Several meetings with the <br />City Council, consulting engineers, financial advisors, city attorney <br />and staff followed in October and November, 1977. On November 28, <br />1977, the City Council formally received the feasibility study for a <br />city -wide storm sewer improvement project and set a public hearing for <br />February 21, 1978. Administrator Achen made a slide presentation of <br />water problems that had occurred after the heavy rains, showing <br />locations around the city that were under water. <br />Roger Short, of Short, Elliott, Hendrickson, introduced Don Christopherson, <br />the project engineers, Jerry Sunde, the consulting hydrologisg, and <br />Dick Moore, an engineer, and stated that they had begun working on the <br />project in November, 1975, and that part of the contract had stated <br />that the study was to be one of ground water control, as well as a <br />study of surface water drainage. <br />Mr. Short stated that the plan his firm has presented to the city uses <br />a five year storm design, which means that the storm sewers will be <br />constructed to handle a storm of the size that is likely to occur <br />once every five years. Existing drainage facilities in Mounds View <br />are of inadequate capacity to carry storm water runoff from even a <br />three year frequency storm. The proposed drainage project would accommo- <br />date full residential, commercial and industrial development of the <br />city, and would provide a trunk system that could be expanded as <br />needed when new homes or businesses were constructed on presently vacant lands. <br />Mr. Short reported that virtually all of the city drains to Rice Creek <br />with most of the drainage entering the Creek upstream of Long Lake. <br />Project 1978 -1 would redistribute the drainage so that a major portion <br />enters Rice Creek via Spring Creek, which is downstream from Long Lake. <br />This feature would reduce runoff pollution of the lake and is an impor- <br />tant element in the Rice Creek Watershed District's attempt to improve <br />the quality of Long Lake. <br />The three existing outflow points to Rice Creek are all to be expanded, <br />with a second 54 inch pipe to be installed at the existing Hillview <br />& I -35W outlet. On Co. Rd. H east of Edgewood Dr. a 48 inch line <br />will serve as the primary outlet, and at Spring Creek the existing <br />36 inch pipe under Co. Rd. H will be paralleled with a 48 inch line. <br />Detention basins are planned in several areas to limit ponding during <br />heavy runoff periods to specially designed sites. The largest basin is <br />to be located north of the Scotland Green Apartments on Co. Rd. H -2, <br />which will detain up to 93 acre feet of storm water and is designed to <br />be part of Silver View Community Park. The second largest basin with <br />85 acre feet capacity is planned north of New T.H.10 on Judicial DitchNo. 1 . <br />Mr. Short reported that the project is proposed to be constructed in <br />three phases during the 1978, 1979 and 1980 construction seasons. Phase I <br />would include the detention basin north of Scotland Green Apartments, <br />which will drain southward via a pipe along Silver Lake Road to <br />Woodcrest Drive and then westward to Spring Creek at Knollwood Drive. <br />Spring Creek will be cleaned to handle increased capacity and its outlet <br />to Rice Creek improved. A 60 inch pipe will extend north of the Scotland <br />Green detention basin, cross existing Highway 10 at County Road I, and <br />