Either parent may petition the Court for a modification of a child support order based upon a showing of a change of circumstances that are substantial and continuing. A substantial and continuing change of circumstances will be presumed if, at the time of application for the modification, support as calculated under this chapter would be more than 15 percent greater or less than the amount provided for in the existing support order. Such petition shall require the other parent to appear and show cause why the decision previously entered should not be prospectively modified. A hearing shall be set for not more than 50 days from the date of service of the motion for modification and order to appear and show cause. [Ord. 50 § 7.8(2), adopted, 3/23/2017.]