Municipal drainage plans provide details of legal points of discharge for stormwater drainage. They may also provide The surface levels of a subdivision show the height at different points on the plan (eg the extremities, perimeter, invert (bottom) level of the kerb, and the pit drainage). of a subdivision.
You can download a copy of a municipal drainage plan (Word 142 KB) for a closer look.
Water authority documentation such as a sewer plan provides details of plumbing fixtures, drainage lines and points of attachment to existing building(s) on a site.
You can download a copy of water authority documentation (Word 167 KB) for a closer look.