10-11-2023 Council Packet - Laserfiche WebLink

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STAFF REPORT TO: Mayor Fischer and Members of the City Council FROM: Bill Dircks, Public Works Director DATE: October 11, 2023 RE: Drainage Improvements at 209 Ryan Drive ACTION TO BE CONSIDERED: Motion to approve drainage improvements at 209 Ryan Drive by Klein Underground in the amount of $12,750. BACKGROUND: The Ramsey Washington Metro Watershed District installed a new, larger culvert underneath Ryan Drive in 2021 as part of a system-wide effort to reduce flooding in the District. The existing culvert was too small to convey stormwater under the road and flooding occurred on a few occasions. The new culvert necessitated the raising of Ryan Drive by up to three feet in certain spots so the culvert would fit under the road. Following the project the City improved Ryan Drive and added sanitary sewer in 2022. The raising of Ryan Drive resulted in different drainage along the road and into the property at 209 Ryan Drive. In effect, there is more standing water for a longer period of time in the parking lot than there used to be before the culvert project. The ultimate overflow is still lower than the buildings on the property so there should not be any threat of flooding the buildings but the property owner has renters that work on vehicles and the vehicles in the lot have had water up to the doors after some of the rain events we have had over the past six months. Staff and the City Engineer have worked with the property owner in trying to find a cost effective way to reduce the amount of water standing on the property after rain events. The Engineer put a technical memorandum together on the issue and it is attached to this staff report along with exhibits. Staff feels the most cost effective way to reduce the amount of water on the property is to lower the ultimate overflow, which is on the east side of the east driveway. By lowering it six inches, the water should escape the property faster and reduce the temporary flooding that has been occurring. The project involves lowering the east driveway and pitching the grade back to the east toward the ditch rather than to the west as it is currently constructed. A concrete valley gutter is also proposed to be installed across the driveway to better hold up against the amount of water that will be running across the driveway. The water will slowly erode the asphalt if it is channelized whereas the concrete will hold up.