The subdivider shall provide on-site grading and on-site and/or off-site drainage; all of which shall take into consideration the drainage pattern of adjacent property and shall treat upstream areas; where appropriate; as though fully improved.

For those residential; commercial; industrial or other projects which drain into the Petaluma River and which exceed normal runoff; the subdivider shall provide; at the discretion of the director of public works/city engineer; pursuant to Chapter 17.30; on or off-site detention areas to accommodate such runoff; or pay fees. Calculation of runoff fees and payment of the fees shall be made pursuant to Chapter 17.30. (Ord. 1653 NCS §4, 1986; Ord. 1530 NCS §2, 1982.)