When rainwater roof drains are authorized to be connected to storm sewers or combined sewers, such conductors shall be connected to the main horizontal house drain or to the sewer main line or lateral as required by the director of public works and shall be properly trapped and vented. Drain from roof and/or areas shall be of the capacity in accordance with square footage prescribed in the following areas:

Drains serving parking areas or similar impervious ground surface areas may be required to pass through a city-approved catch basin prior to connection to the public system. (Ord. 1506-88 § 13, 1988.)