The storm water detention facilities shall be constructed and in use according to the following criteria.
(A) For commercial, industrial and multi-family developments, the facilities shall be constructed concurrent with site grading. A certificate of completion shall be furnished by the developer’s engineer certifying that they have been constructed according to the approved plans before a certificate of occupancy is issued by the city.
(B) For single-family and two-family residential building, the developer’s engineer shall certify that the structural improvements have been substantially complete and the detention facility rough graded before a building permit is issued. A certificate of completion shall be furnished by the engineer certifying that the facilities into which the lot(s) drain have been constructed according to the approved plans before a certificate of occupancy permit is issued by the city.