(A) As a general rule, drainage carried in roadside channels shall be minimized and off-roadway locations shall be used as the primary drainage network whenever practicable.
(B) When roadside channels are required, they shall be contained within a dedicated right-of-way or right-of-way easement. Channel sides lopes shall be no steeper than four to one, except for curves and transitions where slope stabilization acceptable to the City's Engineer may be allowed. Roadways shall be designed for fordable driveway approaches whenever practical. All driveways shall be designed such that drainage flow from a 100-year storm shall not exceed a depth of 12 inches on any portion of the driveway. Should driveway culverts be required, the culvert design, capacity, and general location shall be shown on the construction plans. Minimum driveway culvert diameter shall be 12 inches. In no case shall driveway approaches constitute a blockage of roadway drainage.