29. Dewatering or narrowing work on a watercourse must meet the following conditions:
(1) the equipment and materials used must make it possible to limit the discharge of suspended matter in the littoral zone;
(2) if granular materials are used, they must originate from a duly authorized quarry or sand pit or a site located more than 30 m from the littoral zone and a flood zone;
(3) if the pumped water contains suspended matter visible to the naked eye, it must be discharged (a) into a sedimentation basin located within the right-of-way of a road, if the work is carried out by a government department, public body or municipality, subject to the following conditions:
i. the basin must not be located in the littoral zone;
ii. the basin must not be located in the bank of the watercourse, unless it is impossible to find another location, in which case it must not be located in any wetland present therein;
(b) into an area of vegetation located more than 30 m from the littoral zone, such as a field of grass or forest litter, provided the point of discharge is regularly shifted to a new location.