A.
No development, except as provided in Subsection B below, shall be allowed in floodplain areas which will:
(1)
Cause an obstruction to flow, defined in § 143-34 as any development which physically blocks the conveyance of floodwaters by itself or in conjunction with future similar development causing an increase in regional flood height; or
(2)
Cause an increase in regional flood height due to floodplain storage area lost, which is equal to or exceeding 0.01 foot.
B.
Obstructions or increases equal to or greater than 0.01 foot may only be permitted if amendments are made to this chapter, the Official Floodplain Zoning Maps, including floodway lines and water surface profiles, in accordance with Article VIII, and only if the total cumulative effect of the proposed development will not increase the height of the regional flood more than 1.0 foot for the affected hydraulic reach of the stream unless a waiver is secured from FEMA for the maximum increase of 1.0 foot.
C.
The Zoning Administrator shall deny permits if it is determined the proposed development will obstruct flow or increase regional flood heights 0.01 foot or more, based on the officially adopted FIRMs or other adopted map. NOTE: This section refers to obstructions or increases in base flood elevations as shown on the officially adopted FIRMs or other adopted map. Any such alterations must be reviewed and approved by FEMA and the DNR.