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,06-30-1995 10:23 784 3114 MOUNOSVIEW — PUBLIC WORKS P.03 <br /> 03.'30:05 11:0a FAX <br /> ST. PAUL R1003:005 <br /> • <br /> • <br /> Mr.Paul Harrington <br /> June 30, 1995 <br /> Page 2 <br /> Watershed Management Organization by William W.Walker. as methods meet requirements of <br /> the Metropolitan Council and the City's LWMP. Table 1 summarizes the results. <br /> Table 1 <br /> Estimated Retention Pond Sizes for Each Lot <br /> Storage Volume Approximate Area Total Lot <br /> Required Required Area <br /> I= ac Ft.) (Acresl ihigLe l <br /> 1 0.55 .21 3.94 <br /> 2 0.34 .13 2.59 <br /> 3 0.39 .15 2.85 <br /> In order to evaluate the feasibility of the City providing detention storage in Outlot A,a computer <br /> . model was ran to determine existing and proposed flow rates. The allowable storage in Outlot A <br /> was estimated based on the City's contour maps. Additional storage was assumed to exist in Lots <br /> 1, 2 and 3 based on the proposed plat for the Bridges Technology Center and contour map. The <br /> results of the analysis area summarized in Tables 2 and 3. <br /> Table 2 <br /> Storage Area Assumptions <br /> Elevation Area Storage Volume <br /> (Feed !Acres) (Ac-Ft.1 <br /> 902 1.12 0.0 <br /> 904 2.78 3.9 <br /> 906 3.84 10.5 <br /> Table 3 <br /> Flow Rate Determinations <br /> Qin Qout 100-Year Elevation <br /> Condition 1 feet1 Isisl. <br /> Existing 10 —No ponding— <br /> Future 81 10 903.2 <br /> SNote: Outlet assumed to be a 3 foot weir structure,storm distribution was an SCS Type 1I, <br /> with AMC condition 2. <br />