Manholes shall be installed at all changes in grade and/or direction and at distances not greater than 400 feet apart. All manhole covers shall be water-tight and self-sealing, incorporating an O-ring gasket. All covers shall have concealed pick holes. Where manhole covers may be subjected to frequent and extreme submergence, additional water-tightness shall be ensured by using bolt down covers.
(1999 Code, § 38-5-46)