(a) All parking areas, driveways, and interior circulation roads shall be graded and drained as follows.
(b) The pavement shall be sloped to properly drain. A minimum grade of one percent (1%) is required for all paved areas unless the developer requests that a lesser slope be permitted. The maximum grade for all parking areas is five percent (5%) unless the developer requests that a greater slope be permitted. Slopes in excess of the minimum or maximum prescribed above shall be reviewed by the City Engineer and shall only be permitted where other feasible alternatives are not available and where the excess slope will not cause any site problems. The decision to permit excess slopes shall lie solely with City Engineer.
(c) Where necessary, underdrainage shall be utilized to prevent premature failure of the parking lot and roadway surfaces.
(d) For parking areas in excess of twenty (20) parking spaces, a stormwater management report shall be submitted by the developer. This report shall be prepared by a registered professional engineer and shall include information concerning existing site conditions, the amount of run-off that will occur as a result of the development, and the proposed system of pipes, and inlets proposed to control the stormwater.
(1) For parking areas of twenty (20) spaces or less, a stormwater management report is not required; however, the system of pipes, inlets, and other facilities shall be submitted to the City for review and approval.