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Nfnp To:Athanasia Lewis, City AdministratorFrom:Kellie Schlegel City of CentervilleStantec Project/File:193807350Date:September 3, 2025 Reference: Brian Drive Pond Water Level and Drainage Background: The City has been aware of drainage concerns associated with a small private pond (ÐBrian Drive PondÑ) adjacent to several properties along the north side of Eagle Trail and the east side of Brian Drive. The concerns are primarily driven by the poor drainage in the rear yard of 6996 Brian Drive. Over the last several months, Staff and Council have been working with the property owners and exploring options to address the concerns. I have attached previous memos regarding this issue for background information. Most recently, this issue was discussed at the July 9, 2025 Council meeting. At that meeting, it was determined that the previously proposed option of installing a piped outlet to the pond was not an amenable solution, and Council directed staff to explore other options to address drainage concerns associated with the pond. Existing Conditions: On July 23, city staff, Councilmember Koski, and I visited the site and reviewed the conditions of the pond, the rear yard of 6996 Brian Drive, and the outlet channel. Subsequently, we collected additional survey information on August 19, 2025. The following is a summary of the site observations and preliminary survey results: 6996 Brian Drive has a walkout basement. The rear yard of 6996 Brian Drive is relatively flat between the house and the pond, with areas of ponding and saturated turf. Based on the surveyed elevations, there does appear to be a small area within the backyard that is higher than the existing low floor elevation that may be partially preventing water from draining away from the home. The lowest home elevation adjacent to the pond (6996 Brian Drive) is 905.54. The other homes adjacent to the pond all have low elevations that are higher than that of 6996 Brian Drive. The only outlet for the pond is a swale at the northeast corner. The swale is rather small in size, (approximately 1Ó wide and 1Ó deep in areas), undefined in areas, and flow appears to be inhibited in several locations by sediment, debris, and brush. The swale flows through the rear yards and brushy areas approximately 375Ó to the east to an existing culvert roughly 24Ñ in diameter. The water level of the pond at the time of the survey was approximately 903.50. The highest point of the swale is 904.1, roughly 22Ó downstream of the pond. This indicates that the pond level would need to rise roughly another 0.6Ó before water would freely outlet the pond via the channel. The attached Figure displays the existing conditions, including surveyed elevations and the channel profile. 87