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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 /> <br />Throughout the operational stages of the project <br />impermeable building and paved surfaces will <br />contribute runoff. This runoff is to be subjected <br />to sedimentation and skimming in conjunction with <br />peak runoff storage in depressed grassed areas. <br />Following release from the storage areas the flow <br />will pass through skimming weirs and be discharged, <br />via underground piping, to Silver Lake for further <br />peak storage. Silver Lake, at an overflow eleva- <br />tion, discharges into a network of storm sewers <br />and open ditches which ultimately flow to pike <br />Lake, Long Lake, and Rice Creek. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Rainfall on the impervious roof and pavement sur- <br />faces will collect sediment, oils, salts and other <br />pollutants prior to reaching the 1.01 acre grass- <br />ed depressions and weir systems. The landscaped <br />areas and weir system will retard the runoff flow <br />and enhance the quality of runoff. They will pro- <br />vide time for sedimentation and skimming of float- <br />abIes and permit the grassy swales to absorb and <br />trap many of the pollutants that might otherwise <br />be released into Silver Lake. The proposed drain- <br />age system will accommodate 1.7 acre feet of storm <br />water runoff. Detailed discussion of the proposed <br />system will be presented in the following sections <br />of this report. <br /> <br />I <br />I <br /> <br />II-7 <br />