In the construction of the ordinances of the city, the following rules shall be observed, unless such construction would be inconsistent with the manifest intent of the council. If any portion of an ordinance or the application thereof to any person or circumstances is found to be invalid by a court, such invalidity shall not affect the remaining portions or applications of the ordinance that can be given effect without the invalid portion or application, provided such remaining portions are not determined by the court to be inoperable, and to this end ordinances are declared to be severable.