Page 17 - 2022 SDCA Project

Another, more actionable solution, would be to add a waterproof
membrane against the exterior foundation of the building and a
french drain with perforated pipe and drainage stone immediately
adjacent to the building wall. This would route stormwater to the
southeast corner of the building, where it could be tied into the
existing drainage system. This possibility should be explored by
soliciting input from foundation waterproofing and landscape
contractors.

A second drainage issue occurs at the rear of the building in the
concrete detention basin. The I-shaped weir, designed to release
water slowly, regularly clogs with magnolia leaves from the adjacent
property. A solution to this problem would be to saw-cut the concrete
notch to a more conventional V-shape, as indicated in the adjacent
photo. This would create a larger outlet and prevent clogging with
debris. This intervention would modify the rate of stormwater
drainage from the site and thus require consultation with the City of
Decatur Stormwater Department, the permitting authority for the
existing detention structure.

Image: this photograph displays the existing weir construction and the
proposed cut lines to widen the notch while retaining its stormwater 18
detention function.