Many communities require a Final Grade Survey before the issuance of a Certificate of Occupancy. The builder/owner is required to submit an accurate survey for the lot, including the following: All one-foot contour lines, all topography, all inlets, catch basins, cleanouts, and associated piping. All site features inclining swales, retaining walls, drainage infrastructures, the elevation of all drainage breakpoints, and drainage patterns within the lot. This survey is also known as As-Built/Final Survey. It is carried out during or immediately after the construction is finished. The Final Grade Survey is often presented as an overlay over existing design plans for direct comparison with design information.