Indiana Code Title 36. Local Government § 36-9-27.8-6

(1) consists of:

(2) may also include one (1) or more streams, swales, ditches, natural drains, catch basins, and other components;

(3) is designed to drain excess water from impervious surfaces like paved streets and parking areas;

(4) is located in a subdivision;  and

(5) has not been dedicated to public use and accepted by the county or any other political subdivision in which the system is located.