18.32.070   Drainage easements.
   A.   When storm drains are necessary for the general use of lot or parcel owners in the subdivision and such storm drains are not to be installed in the streets, alleys, or ways of such subdivision, then the subdivider shall offer to dedicate upon the final tract or parcel map thereof the necessary rights-of-way for such facility.
   B.   When the property being subdivided, or any portion thereof, is so situated as to be in the path of the natural drainage from adjoining unsubdivided property and no street, alley, or way within the subdivision is planned to provide for the drainage of such adjoining property, the subdivider shall dedicate drainage rights-of-way adequate to provide in the future for the ultimate drainage of the adjoining property.
(Ord. 82-3-889 § 1 (part))