10-10-1994 Council Packet - Laserfiche WebLink

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1,950 as ution simi- l, the re that the entire raarsh plus addi ional area is needed to effectively treat the incoiaing pollution. Excep tions to this are LL6a, LLlla, and LLllb, These narshes all have comparatively large acreage and arc able to assimilate relatively large pollution loads. b. Quantity Each marsh was analyzed for its ability to control the water runoff fiom a 24-hour, 100-year storm. Seven out of 22 marshes in this watershed needed less than their total acreage to control the storm water runoff with a fluctuation less than one half foot. It must be noted that all of these narshes ^*^5? three sub-watersheds and a majority are located witn- in two sub-watersheds. 4. Recommendations a. In order to establish storm water storage capeity, it is recommended that control weirs be placed at Dickeys Lake and Lake Lydiard, provided that higher lake levels are feasible and acceptable to the prop erty owners. b. Erosin in the creek channel between Long Lake and Holy Name Lake and Wolsfeld Lake could be decreased by construction of control weirs at the outlets of the latter two lakes. c. Long Lake’s shoreline marsh boundaries should be established based on existing or historical high water elevations xvhich are available from the DNR. d. Any new construction within or affecting the drain age area of the marshes should be closely checked to control problems which could^eve^lopj^ French Lake and T^ager Lake (Hennepin Coi^y Ditch No. 27) 1. Desc'ription In 1915 the count)\itch systen/fn this area was initiated when the Hennepin CoiAiy Boa^f Commissioners aPPOtnted W E Stoopes to surve\and^y out a system to improve Jhrs in the vici\i>y of French Lake and Tanager uL^fnote? Taniger Lako>^ called Round Lake or Mud tkke L U.S.G.S. Lpogipi^al sheets and Hennepin County records). A man showing the >Tfected ar^ within the government meandered bounda^^s of the abov^^entioned lakes, to gether with th^creages of marshdry areas and the VII-10 \