Book # 74 3-12-96-7-9-96, 96-055- 96-150

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Agenda Section: VI I I-1 CITY OF NEW BRIGHTON Report Number: 96-147 REQUEST FOR COUNCIL CONSIDERATION Report Date: July 9, 1996 ITEM DESCRIPTION: LONG LAKE ROAD AND KARI LANE DRAINAGE PROBLEM DEPT. HEAD'S APPROVAL: MANAGER'S REVIEW/RECOMMENDATION: No comments to supplement this report (Uh� Comments attached EXPLANATION/SUMMARY (attach supplemental sheets as necessary) The purpose of this item is to obtain Council approval of the attached Cooperative Agreement No. 96012 with Ramsey County and approval of Plans and Specifications and authorization to advertise for bids for the Relocation of the Pike Lake Channel Storm Sewer. Several time a year,during heavy rains,the intersection of Long Lake Road and Kari Lane floods to a depth which is impassable to vehicles. On several occasions the depth of water has risen above the curb and flowed into the backyards and basements of the homes on the west side of Kari Lane. The magnitude of the flooding problem is depicted on the attached photographs showing the Long Lake Road and Kari Lane intersection after a heavy rain. The problem has peaked since the development of Creekview Estates in 1991,the new residential subdivision north of the Long Lake Road/Kari Lane glirsection. Prior to the development of Creekview Estates,the site was lower than the road and the storm water ponded the vacant site instead of the road. The reason the existing storm sewer system is not handling the drainage in this area is because it is backed up from high water in the Pike Lake channel where it discharges. See the attached Storm Sewer System Map. The current normal water elevation in the channel is about 18 inches above the bottom of the storm sewer which keeps the storm sewer about half full of water at all times. This submerged condition reduces the storm sewer's capacity. The elevation of Pike Lake and the channel are maintained by a weir gate in the box culvert under Long Lake Road. The current normal water elevation of Pike Lake and the channel was apparently establish some time after the installation of the storm sewer system which was installed in 1968. In 1968 the normal water elevation of Pike Lake and the channel was apparently much lower as it would have been very difficult and impractical to install the storm sewer under 18 inch of water. RECOMMENDATION To 1.)APPROVE COOPERATIVE AGREEMENT NO. 96012 WITH RAMSEY COUNT FOR RELOCATION OF THE PIKE LAKE CHANNEL STORM SEWER,AND 2.)APPROVE PLANS AND SPECIFICATIONS AND AUTHORIZE THE ADVERTISEMENT FOR BIDS FOR THE RELOCATION OF THE PIKE LAKE CHANNEL STORM SEWER. Leslie J. Proper,P.E. • Director of Public Works G.IENGICCR-96195-6RPT.WPD