3.2 Water Quantity
- The City of Shorewood has identified a future need to consider the construction of outlets for two landlocked basins, LMC-7 and LMC-8 (see Figure 2). Outlets would increase downstream volumes conveying additional pollutant loading to Lake Minnewashta. Outletting will generally be discouraged unless there is a demonstrated threat to property structures or public safety.
- Development, redevelopment, and reconstruction in the subwatershed are predicted to increase nutrient and TSS loads from the watershed as well as increase the volume of stormwater runoff.
- Increased volumes would have a negative impact on channels and culverts conveying stormwater, increasing erosion potential. Specific problem areas identified in the HHPLS were a small channel draining LMC-5, and the Minnewashta Creek culvert under TH 7.
- The HHPLS identified two locations that are predicted to overtop during 100 year or larger events: a private driveway and an old driveway or trail at the outlet of LMC-4.