A violation of any provision of CVMC 14.08.010 or the failure of the owner of property over which there exists a watercourse to keep and maintain the portion of said watercourse located on his property free of obstructions to the free flow of drainage water is hereby declared to constitute and be a public nuisance; provided, however, that existing drainage facilities constructed prior to February 17, 1967, which have not decreased the capacity of the natural watercourse, shall not be construed as a nuisance for purposes of this title. (Ord. 2597 § 9, 1994; Ord. 2466 § 9, 1991; Ord. 2199 § 1, 1987; Ord. 1032 § 1, 1967; prior code § 26.116).