No person shall discharge or cause to be discharged any stormwater, ground water, roof run-off, subsurface drainage, uncontaminated cooling water, or unpolluted water in any sanitary sewer. Stormwater runoff from limited areas which is likely to be polluted at times may be admitted to the system by a permit from the Director of Public Works. Where storm sewers or drains are not or cannot be made available, limited quantities of approved water from installations such as swimming pools may be admitted to the sanitary sewers by a permit from the Director of Public Works. City Code, 1976/83, art. 25, §6(a)(1) Ord. 75-914 Ord. 84-129 Ord. 91-775