Drainage channels and floodplains, which exist and which are indicated in the Comprehensive Land Use Plan, are essential for the maintenance of the health and general welfare of the people of the City. Any encroachment, filling, or destruction of these drainage channels or floodplains is a violation of this Ordinance; provided, however, that this shall not prevent development of property for its best use, when adequate facilities, as determined by the Administrative Official, are provided to maintain the prime purpose of the drainage channel or flood plain, i.e. the uninterrupted flow of surface water. Said development shall be, among other things, done in compliance with all applicable City regulations.