21.20.260   Watercourses.
   A right-of-way for storm drainage purposes shall be required and shall conform substantially with the lines of any natural watercourse or channel, stream, or creek that traverses the subdivision. If a parcel of land to be subdivided includes a portion of the right-of-way to be acquired for flood control or drainage purposes and the city council determines the boundaries of the right-of-way to be acquired, such right-of-way shall be shown on the tentative and final and parcel maps and shall either be dedicated or withheld from the subdivision.
(Ord. 3157 § 1 (part), 1979)