01-23-1995 Council Packet - Laserfiche WebLink

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City of Orono Kelly Avenue Area Storm Drainage Improvements January 1995 Introduction The City of Orono ordered the preparation of this report to evaluate the feasibility of improving the drainage for the ponds on Kelly Avenue North of Carman Road. The drainage in this area has been a problem for 20 years or more. The purpose of this report is to define options for improvements and provide estimated project costs to determine project feasibility. The project will require permits from the Watershed and DNR. The existing storm drainage system maximizes the time it takes for storm water to discharge into Lake Minnetonica. The use of the ponding areas with the slow discharge rates make this an environmental sensitive system. It would be desirable to incorporate the principals of the existing system with any proposed improvements. The existing drainage system has been pieced together over time as development occurred. The storm sewer lines are of various sizes and don't seen to have a consistent direction of flow (figure 1). The flooding of Kelly Avenue occurs annually and the street is impassible during certain periods of time. This results in an inconvenience to the neighborhood and a safety problem for the roadway users. The objective of this project is to reduce the amount of time water stands over Kelly Avenue. The elevation of Kelly Avenue in this area is only 1.5 feet above the ordinary high water level for Lake Minnetonka. The vegetation in the ponding areas between Kelly Avenue and Carman Road make it impossible for the water to recede in a reasonable amount of time. Project Description The Kelly Avenue drainage basin includes 30 acres of residential property and 5 acres of commercial property. The basin generally drains southwest to Kelly pond and then into Carman Cove. The existing ponding areas work very well but there is an inadequate outlet for the ponds. The water quality discharging into Carman Cove needs to be considered when improving the storm drainage system. The existing storm sewer system does a good job of controlling the water quality. We would like to maintain the water quality by minimizing the discharge from Kelly pond into Carman Cove. The elevation of Kelly pond relative to Lake Minnetonka make it very difficult for any system to work efficiently. The high water elevation of Lake Minnetonka (931.5) is the same elevation as the desired high water elevation of Kelly pond. The improvements outlined in this report will maximize the storage in Kelly pond. The rate of discharge to Carman Cove will be minimized and the water quality will be maintained. Bonestroo, Rosene, Anderiik <& Associates, Inc. 13976.rpt