All surface water originating on a site, plus any and all surface water entering a site from adjoining property, shall be suitably collected on the site and shall be discharged to the storm sewer system where available. Determination of availability of storm sewer shall be the responsibility of the City Engineer, whose decision shall be final. Storm sewers shall be constructed in compliance with the Wisconsin Plumbing Code and other applicable regulations, as from time to time amended. If no storm sewer is available, surface water shall be discharged from or retained on a site in a manner approved by the City Engineer. This section shall not apply to single- and two-family developments.

(Code 1976, § 18.32.080)