09-19-1994 Planning Packet - Laserfiche WebLink

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r 1 I1 4 i I ! I 4 \ 1 1 i i I !• J 1 i Elevation Lake -“(no nane) School - • - --(no nane) Wolsfeld Holy Name Lydiard Dickeys (ft. MSL)Acres Location 1,000 7S Medina 990 11 II >12 • f -36 If 994 80 If 976 20 Orono 982 13 • 1 The average level of Long Lake is 944 feet, A fish trap combined with a stop log control is maintained by the DNR in the concrete box culvert outlet structure located north of Old Long Lake Road on the Union Ceme- tary property owned by the City of Orono, From this point, the lake outlet flows are carried via Long Lake Creek and County Ditch No, 27 to Tanager Lake ar.d Lake Minnetonka (see Figure 2). 2. Simulated Storm Water Runoff Hydrology A simulation of a 24-hour, 100-year storm was done on the Long Lake Watershed, The Long Lake Watershed has a very intricate flow network with many sub-watershcds flowing into others. For instance, sub-watershed LL14, which is located mostly in Medina (see Figure 2) flows into LL4 and then directly into Long Lake, This flow network is interesting because of its volume, LL14 has 2 950 total acres and discharges into LL4 at a rate of 195,3 c,f,s, (see Table 1), LL4 then temporarily stores part of this water and discharges into Long Lake at a rate of 90,8 c.f,s. This type of situation exists to a certain degree in many of the other sub-watersheds. Marshes and Wetlands The total watershed area consists of approximately 1,950 acres and is comprised of the following catagories: Acres Percent 1,417 11 17 Land (approx,) Marshes and Wetlands (approx,) 208 Lakes 525 To effectively evaluate the marsh and wetlands areas within this watershed, they were analyzed for pollution from storm water runoff and potential pollution assimi lation within each sub-watershed. a. Quality VII-9