(a) The subdivider shall construct all necessary facilities including underground pipe, inlets, catch basins, open drainage ditches, and detention basins or retention ponds as approved by the Village Administrator, to provide for adequate disposal of subsurface and surface water and maintenance of natural drainage course. The developer shall also provide all necessary soil sediment pollution control. Design and construction shall be in accordance with the Design Criteria and Construction Standards and Drawings of the Village. Adequate provisions shall be included in design and construction to accommodate all upstream and downstream drainage and, where necessary, extend all drainage improvements to plat limits. It shall state on the final plat that all natural watercourses, detention basins, retention ponds, and appurtenances shall be maintained by the property owner. An easement shall be provided to ensure that there will not be any building within the drainage facility and to provide for major maintenance and inspection. See the Village of Ada Design Criteria for inspection and ownership of detention basins.
(b) All lots shall be laid out and graded to provide positive drainage away from buildings and shall be designed to assure adequate protection from the concentration of stormwater run-off on adjacent property. No storm drainage, including drain tile around basements, shall be permitted to discharge into any sanitary facility. All buildings must be connected to the storm drainage system.