The grades of the several streets of the town shall be the grade at the centerline of such streets, and the grade between all points given shall be in a uniform direct line between each two (2) points so given, ascending, descending or level, as the case may be. The grades of the sidewalks along the several streets shall be the grades at the building or lot line of the property adjacent to such sidewalks, and the grades between all points where elevations are given shall be in a uniform direct line between such points ascending, descending or level, as the case may be, except when otherwise especially provided. (Ord. 183, 5-7-1991; amd. Res. 95-99, 1-5-1999)