§ 8106-8.1.4. If there is a difference in grade levels on the two sides of a fence, the height shall be measured from the higher grade, provided that the distance from the lower grade to the top of the fence shall not exceed ten feet, and further provided that in a required setback adjacent to a street, fence height shall be measured from adjacent grade of the street side of the fence. "Grade" shall be the lowest level parallel to and within five (5) feet of the fence in question.