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Landing at Lake Michael Storm Drainage
and Flood Study

Mebane, NC | Boylan Development

As part of a 327-lot subdivision located on 172 acres, WSP SELLS completed a flood study to confirm that the project would not impact upstream and downstream properties in this area. The flood study was used to help in the economical selection of the method to cross the stream with either traditional round or box culverts, or a single-span bottomless culvert to have access to the remainder of the property. The detailed stormwater analysis was used to ensure that the roadways were elevated above the 100-year flood stage.

The project also included nine Best Management Practices (BMP) devices to be installed to handle water quality and quantity and also to route offsite flows through the project while not impacting adjacent properties. The design concluded that to avoid environmental impacts a bottomless culvert would be needed to cross Michael’s Creek. An existing sewer line parallel to the stream complicated matters by requiring the culvert design to span the environmentally sensitive areas while allowing for maintenance and access to the sanitary sewer line.