10-14-2002 Council Packet - Laserfiche WebLink

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REQUEST FOR COUNaL ACTION ••'OPTING 1 4 2002 DATE: October 14,2002 ITEM NO.: /j Department Approval: Niinc Gregory A. Gappa Title Director of Public Services Administrator Reviewed: Agenda Section: Public Services Director's Report Item Description: Accept Quotation Livingston Avenue Drainage Project This property has a large drainage swale through the middle of the property that flows between the house and the garage. This swale drains 3 acres of land that is fully developed at an urban density. The drainage across this property has been a concern for many years with a substantial amount of storm water runoff through this property. In 1998 a feasibility study was completed for a possible assessment project to install an 18" storm sewer pipe from the low point in Livingston Avenue though several properties up to the south side of the old Dakota Rail tracks from where the water would then flow north. This project was never completed because there was opposition from the neighborhood residents concerning the assessments for this project, and the impacts of project construction across neighborhood yards. There is not a very good outlet for this water downstream, so installing a pipe could be problematic and result in drainage problems further downstream. Our recommendation is that, in many cases, installing storm sewer pipe to solve drainage problems is not the most ideal solution. Whenever possible, maintaining existing overland flow drainage patterns is the best solution in terms of environmental, financial, and property disturbance impacts. Once you start piping water there is no end to the process of building pipes. No matter where you end the pipe there is the possibility of complaints of too much water in the area. In existing developed areas, there are normally not any drainage easements inplace, and obtaining easements and constructing storm sewer projects can be expensive and difficult. We have worked with the property owners and developed a project to solve the drainage problems on this property while at the same time not changing the existing overland drainage pattern downstream. The property owners have spent substantial money to reduce the drainage problem between their house and garage with the construction of a rock lined swale to get the storm water runoff past the house and garage. Before improvement of the drainage swale the house and garage were subject to flooding. There is currently a catch basin sump structiue at the edge of the street that does not have an outlet. This catch basin overflows and the water then flows across the front yard and then into the rock swale. This area is relatively flat which results in a wet yard with ponded water in the yard and swale. The proposed solution is to install a 12" diameter perforated draintile outlet from the sump catch basin that will outlet into the rock swale behind the garage. This should result in minimal downstream drainage impacts as the water will continue to flow through the swale and then across Page 1 of 2