4.3. Measures relating to the low-velocity zones of floodplains
The following are prohibited in the low-velocity zone of a floodplain:
(a) all structures and undertakings which are not flood-proofed; and
(b) filling works other than works required to flood-proof authorized structures and undertakings.
Structures, undertakings and works may be permitted in the low-velocity zone of a floodplain if flood-proofing measures other than those listed in Annex 1 have been found to be sufficient in connection with an exemption granted under the Act respecting land use planning and development (chapter A-19.1) by a metropolitan community, a regional county municipality or a city exercising the powers of a regional county municipality.