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the entire narsh plus additional area is needed to <br />effectively treat the incoming pollution. Excep­ <br />tions to this are LL6a, LLlla, and LLllb. Those <br />marshes all have comparatively large acreage and arc <br />able to assimilate relatively large pollution loads. <br />b. Quantity <br />Each marsh was analyzed for its ability to control <br />the water runoff from a 24-hour, 100-year storm. <br />Seven out of 22 marshes in this watershed needed less <br />than their total acreage to control the storm water <br />runoff with a fluctuation less than one half foot. <br />It must be noted that all of these marshes <br />three sub-watersheds and a majority are located with­ <br />in two sub-watersheds. <br />4. Recommendations <br />a. In order to establish storm water storage capeity, <br />it is recommended that control weirs be placed at <br />Dickeys Lake and Lake Lydiard, provided that higher <br />lake levels are feasible and acceptable to the prop­ <br />erty owners. <br />b. Erosin in the creek channel between Long Lake and <br />Holy Name Lake and V/olsfeld Lake could be decreased <br />by construction of control weirs at the outlets of <br />the latter two lakes. <br />c. Long Lake's shoreline marsh boundaries should be <br />established based on existing or historical high <br />water elevations which are available from the DNR. <br />d. Any new construction within or affecting the drain­ <br />age area of the marshes should be closely checked to <br />_ _ _ _cont'ol problems which could develop. <br />French Lake and T^ager Lake (Hennepin Cou^y Ditch No. 27) <br />1, Desc'fiption <br />In 1915 the county \itch system/in this area was initiated <br />when the Hennepin Couiity BoardXof Commissioners appointed <br />iV. E. Stoopes to surveXand J<ay out a system to improve <br />the drainage in the vieof French Lake and Tanager <br />Lake (note* Tanager LakerOs called Round Lake or Mud <br />bkke on U.S.G.S. topogix<ph\^al sheets and Hennepin County <br />records). <br />A map showing the Effected are^within the government <br />meandered boundaXes of the abovVmentioned lakes, to­ <br />gether with th^p^creages of marsh a^d dry areas and the <br />VII-10