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<br />Winter Draw-down <br />Pros <br />Inexpensive <br />Convenient for the City <br />Cons <br />May cause fish kills (not evident in 2003) <br />Need a DNR permit <br />Results may be hard to determine until growing season <br /> <br />Mechanical Harvesting <br />Pros <br />None <br />Cons <br />Can be costly <br />ALL plants must be removed from the lake <br />Need a DNR permit <br />Temporary solution <br /> <br />Herbicide Control <br />Pros <br />Contact herbicides act quickly and kill all plant cells that they contact <br />Aeration, particularly at night, for several days after treatment may help control the <br />oxygen depletion <br />Cons <br />Temporary Water-use restrictions are imposed in treatment areas <br />Requires a DNR permit <br />Costly <br />Sometimes only the stems and leaves die <br />Oxygen depletions can kill fish <br />Determining area and/or volume of the pond or area to be treated (much harder when <br />dealing with a reservoir that has constant water flowing through it) <br /> <br />The DNR has suggested that if the City decides to draw down the lake in 2005. we <br />begin October I" and October I Sth at the latest. This will give the turtles time to move <br />down below the new water line. The DNR does understand that this may interfere <br />with recreational activities on the lake. However, City staff is recommending that the <br />draw down occur in 2005. <br /> <br />2 <br />