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Agenda Section: VIII-4 CITY OF NEW BRIGHTON Report Number: 9 7-2 70 REQUEST FOR COUNCIL CONSIDERATION • Report Date: December 18.1997 ITEM DESCRIPTION RECOMMENDED OPTION AND PROPOSED FUNDING FOR KARI LANE AND LONG LAKE ROAD FLOODING DEPT. HEAD'S APPROVAL: MANAGER'S REVIEW/RECOMMENDATION: No comments to supplement this report_ihl iteik:P" Comments attached EXPLANATION/SUMMARY The purpose of this report is to recommend that Council approve the recommended option in the Barr Engineering, November 6, 1997, Supplemental Report- Kari Lane Flooding Analysis, and authorize the preparation of plans and specifications for an April 1998 bid letting and spring construction. The recommended option includes: 1. the installation of a 60-inch arch pipe relief storm sewer from the low point on Long Lake Road just west of Kari Lane to the Pike Lake channel box culvert, and 2. the installation of high capacity catch basins on the box culvert to intercept drainage from the south. The 60-inch arch pipe storm sewer would be located along the north curb of Long Lake Road. Several high capacity catch basins, or possibly a special high capacity inlet device built into the curb and boulevard at the low point, will be installed to get the water into the new storm sewer. A colored aerial map of the recommended option is attached. e recommended option meets both the 10-year level of service for the storm sewers and the 100-year level of protection r the critical homes on Kari Lane. Based on feedback I have received, it appears that the residents support the recommended option and that the residents' drainage expert,Mr. Bud Johnson, believes the recommended option is sound. We are also recommending that a small berm be installed on the southeast corner of 14th Street and 16th Avenue NW and that the low area between Kari Lane and 16th Avenue NW be restricted from filling and the installation of structures that would reduce the available storage needed for protection from local flooding. The berm at the southeast corner of 14th Street and 16th Avenue NW would be approximately two feet high and twenty feet long and would keep fast running water from 14th Street from jumping the curb and flowing into the low area between Kari Lane and 16th Avenue. The berm will be located on the City boulevard and cost less than $500. RECOMMENDATION 1. To approve the recommended option for the Kari Lane Flooding problem as summarized in this report and authorize the preparation of plans and specifications. Plans and specifications to be prepared by Barr Engineering Company under the direction of the Director of Public Works. 2. To authorize the Director of Public Works and City Attorney to prepare declarations of covenants to insure no filling or structures are placed in the low area between Kari Lane and 16th Avenue NW ckat:_t_i. JO 6'W, t/ Leslie J. Proper, P.E. Director of Public Works III I IENG1NEERIENG1-97-CLIRE PORTSIKARIFRPT.WPD