This article shall not apply to the construction of any drainage facility for subdivisions, the final subdivision map of which has been approved by the department of planning and permitting within 30 days of the approval date of this article, nor to any drainage improvement where participation by the city has been approved by the chief engineer before the approval date.
(Sec. 16-6.17, R.O. 1978 (1983 Ed.)) (1990 Code, Ch. 14, Art. 12, § 14-12.17)