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Highway 694: This structural. problem may <br />have created hydraulic capacity problems. <br />''` Problem - Low lake levels occur on Lake Wabasso <br />during periods of low precipitation and declining <br />ground water levels. <br />c~i„+;nnc <br />a) Ground water pumps from Ramsey County wells <br />may be used to augment the Lake Wabasso as <br />has been done since 1923. <br />b) The Lake Wabasso .outlet structure should be <br />retained to maintain the low water level. <br />Comment: The improved lake outlet is not <br />necessary based on the analysis in this plan. The <br />Shoreview plan proposed replacing the outlet <br />channel with storm sewer. This would eliminate <br />one hydraulic control point, improving the <br />efficiency of the system's inlet condition at I- <br />694. <br />Ground water pumping will be addressed in a <br />following section. <br />~' Grass Lake Problem - Culverts exist which allow flow between <br />Grass Lake and West Vadnais Lake during periods of <br />high lake stage. <br />Solution <br />a) Construct controls on these culverts to <br />separate the watersheds. Use controls which <br />can be adjusted if necessary. <br />b) In conjunction with Vadnais Lake Area WMO, <br />develop a plan for controlling flow between <br />Grass Lake and West Vadnais Lake. <br />Comment: The construction of a new outlet pipe <br />under Rice will be completed in 1990 (MnDOT). The <br />GLWMO will be able to construct a gated control to <br />manage flow between watersheds. <br />Snail Lake Problem - Snail Lake decreases the lake volume and <br />stage during low precipitation years. The lake <br />anal ground water interaction has not been <br />investigated recently. Based on 1923 monitoring <br />and lake budget analysis, Snail Lake has had a <br />large contribution to ground water for many years. <br />3.2 - 13 <br />