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4/90 <br />694 and the Soo Railroad, and the ditch from the Soo <br />Line Railroad to Grass Lake. The culverts beneath <br />` Interstate Highway 694 and Soo Line railroad are the <br />responsibility of the .State Department of <br />Transportation and the Soo Line Railroad, respectively. <br />3. Excessive high lake stages and an associated flooding <br />could occur on private property. Flooding has created <br />difficulties with piers, boats and shoreline erosion. <br />4. High stages can best be avoided by maintaining the lake <br />stages close as close as possible to the normal lake <br />stage period. Increased discharge to Grass Lake curing <br />severe events is not expected to cause any flooding <br />problems around Grass Lake because the flood-prone <br />houses have been removed. <br />5. The existing Lak® Owasso outlet reaches a peak capacity <br />of about 16 cfs at a stage of 887,4 AtG~7D, about 1.® <br />feet above normal stage.. To handle the June, 1978 <br />storm or a similar 100-year occurrence interval event <br />without increasing the lake stage more than 1.0 foot, <br />the outlet must have a capacity of about 50 cfs at <br />886.0 NGVD and about 80 cfs at 887.4 ATGt1D. The Lake <br />Wabasso outlet and culverts to Grass Lake must also <br />have the capacity to convey slightly greater flows to <br />prevent excessive stages on Lake Owasso and Lake <br />Wabasso. The outlet from. lake Wabasso to Grass Lake <br />;rust convey 70 cfs and 885.9 NGVD on Lake Owasso and <br />1.00 cfs at 886.4 NGVD, to handle 100-year reoccurrence <br />interval storm event. The outlet structure should also <br />be designed to minimize any collection of debris and <br />consequent plugging. <br />6. A control structure should be designed and constructed <br />to prevent uncontrolled flow of water between Grass <br />1.3 - 2 <br />