No human habitation, cottage, tent, camp site, or residence of any kind, either temporary or perms, shall be hereafter built, set up or constructed upon any land within 660 feet of the high-water line of Lake Claremore or Reservoir or of a watercourse in Claremore Water District, except upon such or any part of such lands, the natural drainage of which is not into such reservoir or watercourse, provided, however, that the city may construct and maintain such structures within such prohibited territory as may be necessary in the furtherance of the protection of such reservoir from contamination and pollution.
(`83 Code, App. 5, § 13)  Penalty, see § 10.99