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WATERSHED CHARACTERISTICS: <br />A. The size of the watershed is approximately 110 acres. <br />Land use in the watershed is about 30% open space, 5% <br />parking lot and large institutional buildings, 65% urban <br />residential with average lot size about 1/3 acre. The <br />soils in the watershed are predominantly Hayden fine <br />sandy loam with slopes ranging from 0 to 24 percent. <br />The average slope is 8 to 10 percent. <br />B. Stormwater runoff from the new development to the west <br />of the outlined watershed boundaries does not drain into <br />Lake Forest. Instead it drains into the ditch along <br />I--694 and then into Pike Lake. <br />DETERMINATION OF PROBLEMS: <br />The problems associated with this body of water are outlined <br />below: <br />A. Fluctuations in the water level. This results in a <br />weedy type of vegetation around the shoreline between <br />-the high water elevation and the normal water elevation. <br />B. A rise in the high water elevation has resulted in the <br />loss of some trees. More trees will be lost if the high <br />water elevation is increased from what it is at the pre- <br />sent time. <br />C. The water quality of the lake was not determined, but <br />it can be expected to be polluted to some degree. Because <br />of the urban nature of thw watershed, the following <br />-pollutants could be expected to appear in the lake: lawn <br />fertilizers and herbicides, road de-icing salt, sand from <br />streets, organic debris deposited in streets (primarily - <br />-grass clippings and leaves), oil from automobile traffic <br />=and driveway and street maintenance, and sediment from <br />-- construction sites. Because the lake has no outlet these <br />v pollutants tend to have a cumulative effect. <br />