a. Public mainline, lateral or connector pipe storm drains shall not be less than 12-inches inside diameter, and shall begin at a structure and terminate at an approved point of disposal per City Engineer.
b. When two parallel pipes are installed in lieu of a box culvert, the minimum separation between the pipes shall be one foot or 1/3 the diameter, whichever is greater. This requirement may be waived if the void between the pipes below the springline is filled by grouting or other approved method.