(A) An adequate system of storm water drainage designed for a 15-year maximum rain shall be constructed and installed consisting of pipes, tiles, manholes, inlets, catch basins or other necessary facilities which shall, under normal conditions, adequately drain the subdivision and protect roadway pavements and prevent the accumulation of storm water at any place. Such drainage system shall be subject to approval by the County Engineer.
(1) Storm drainage, including drain tile around basements, shall not be permitted to empty into any sanitary sewer. Where a public storm water sewer is reasonably accessible, as determined by the County Engineer, the subdivider shall connect with such storm drainage system and shall do such grading and provide such drainage structures, including lateral connections, as may be required by the County Engineer. Where a public storm water system is not reasonably accessible as determined by the County Engineer, but where the plans for the storm water drainage system of the district in which the subdivision is located have been prepared and officially approved, the subdivider shall install drainage facilities as may be required by the County Engineer.
(2) If the subdivision is in an area where a public storm water system is not available, the subdivider shall do such grading and provide such drainage structures as may be required by the County Engineer. No diversion of storm water shall be permitted.
(B) Backyard swales may be permitted, subject to the following regulations:
(1) Maximum and minimum slopes and general design criteria of the Federal Housing Administration’s “Minimum Property Requirements” will be acceptable, except as herein modified;
(2) No continuous swale shall have a length exceeding 600 feet;
(3) Minimum grade of the flow line shall be .4%;
(4) At no point in the swale shall the flow line be more than three feet below the finished grade of the topsoil at the foundation of the house opposite the swale; and
(5) No change in alignment of a backyard swale shall exceed 45 degrees.
(Ord. 0-2005.4, passed 11-8-2005) Penalty, see § 152.999