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REQUEST FOR COUNCIL ACTION <br /> DATE: May 11, 2015 <br />ITEM NO: <br />___________________________________________________________________________________________ <br />Department Approval: Administrator Reviewed: Agenda Section: <br />Name Adam Edwards ATE JML Public Works Director/ <br />Title Public Works Director/City Engineer City Engineer’s Report <br />____________________________________________________________________________________ <br />Item Description: Kelly Avenue Drainage <br />________________________________________________________________________________________________________ <br />List of Exhibits <br />A- Kelly Avenue Drainage Study Dated November 24, 2014 <br />B- Kelly Avenue Drainage Study Estimate Date November 24, 2014 <br />C- Carmen Bay 18in Outlet Engineer Estimate Dated April 20, 2014 <br />D- Kelly Avenue Drainage Improvements Engineer Fees Dated May 6, 2015 <br />1.Purpose. The purpose of this action item is to gain council approval for drainage improvements in the <br />Kelly Avenue Area. <br />2.Background. Residents of Kelly Avenue reported excessive flooding in the street during larger <br />rainfall events and are further concerned about the impact of future development on the storm system in <br />the area. Last fall Bolton & Menk, Inc was contracted to conduct a drainage analysis and provide <br />recommendations. The results of the study are Exhibit A. <br />3.Drainage Study Findings and Options. (Exhibit A) <br />a.The drainage study found that the constriction of flow by undersized culverts is the likely cause <br />of the flooding of Kelly Avenue during large rainfall events. The study provided three potential <br />improvements which are listed in the table below with their associated costs. <br />Phase Description Cost Estimate <br />1 Upsize Outlet to Carman Bay – 18” (Exhibit C) $58,768 <br />Engineering Fee (Exhibit D) $11,900 <br />Total for Phase 1 $70,668 <br />2 Kelly Avenue Culverts –Replaced $27,000 <br />3 Replace Outlet for West Kelly Avenue $44,000 <br />Total $141,668 <br />b.The other concern with Kelly Avenue is the relatively low elevation of the roadway with respect <br />to the high water level of Lake Minnetonka. Regardless of any culvert work completed the roadway will <br />still be threatened during years with very high lake levels combined with major rain events. These issues <br />cannot be addressed without significant work to Kelly Avenue itself. <br />4.Recommendation. I recommend that we start from the downstream end and work our way back. We <br />will start this summer with Option 1, upsizing the outlet to Carmen Bay. Next year we will complete <br />Options 2 and 3. <br />5.Funding. This project was not included in the current CIP however funds are available in the Storm <br />Water Fund. <br />COUNCIL ACTION REQUESTED: Motion to authorize Bolton and Menk to manage the design and <br />construction of a new 18” Culvert at Carmon Bay Road. <br />13 <br />Item #13 - CC Agenda - 05/11/2015 <br />Kelly Avenue Drainage <br />[Page 1 of 8]