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(C(0) 1 PY Barr 8300 Norman Center Drive 555 West 27th Street • Minneapolis,MN 55437-1026 Hibbing,MN55746 Phone:(612)832-2600 Phone:(218)262-3465 Engineering Company Fax: (612)832-2601 Fax: (218)262-3460 May 14, 1996 Mayor and Council City of St. Anthony 3301 Silver Lake Road St. Anthony, MN 55418 Re: Drainage District 6 Partial Implementation Study Ladies and Gentlemen: We have examined the feasibility of partially implementing recommendations contained in the July, 1992 Barr report Stormwater Management Analysis, District 6 Drainage Basin. Anticipated development of a-parcel of land (now developed as a trailer park) located at the northeast corner of Stinson Boulevard and Kenzie Terrace prompted this study because the 1992 report proposed a :.stormwater detention pond at this location.- This.letter summarizes the feasibility of a partial implementation of.that.alternative which would have maximized stormwater storage in District 6, and concludes that potential flood reduction benefits may not justify the estimated construction • costs. . We also did a preliminary analysis of an alternative not previously considered, in which as much of the tailer park parcel as necessary would be converted to stormwater ponding and a larger relief sewer would be built to carry water that now accumulates in the area subject to flooding to the larger pond. We considered this additional alternative so there would be no question that the city had been thorough in considering ways to deal with the problem prior to making any decision regarding the trailer park parcel. As with the partial implementation of the alternative in the 1992 report, we concluded that potential flood reduction benefits may not justify the estimated construction costs. Background In 1992, the City of St. Anthony retained Barr to analyze flooding of city streets and private property within Drainage District 6 following intense rainstorms. The results of that analysis are described in Barr's July 1992 report. The report concludes that the alternatives to resolve the drainage problems are very expensive or require acquisition of developed property. The 1992 report discusses three alternatives: 1) increased downstream storm sewer capacity, 2) construction of a combination of stormwater ponds and diversions, or 3) flood protection of existing property. Flood protection was chosen by the city as the preferred alternative, because of the high construction costs of either adding capacity or constructing diversions and stormwater ponds in this developed area (as well as other considerations, such as elimination of parkland and tax base). Since that time, many property owners in the flood prone areas have reportedly made flood protection improvements to their homes. • The city expects increased interest in developing the 20-acre parcel of land located at the northeast corner of Stinson Boulevard and Kenzie Terrace. Before considering any development which would