25. The maintenance work on a watercourse covered by section 335 of the Regulation respecting the regulatory scheme applying to activities on the basis of their environmental impact (chapter Q-2, r. 17.1) must meet the following conditions:(1) it must be carried out in the lower one third of the height of the bank;
(2) it must not be carried out during a period of flooding in the watercourse;
(3) it must be solely for the purpose of removing accumulated sediment or, where the original plans of the watercourse are available, the work must not allow the watercourse to be excavated beyond the depth indicated in the original plans of the watercourse.
In addition, during the carrying out of the work covered by the first paragraph, the sediment removed must meet the following conditions:(1) it must be deposited and graded outside the littoral zone or a wetland located in a lakeshore or riverbank;
(2) for the cleaning work covered by subparagraph 1 of the first paragraph of section 335 of the Regulation respecting the regulatory scheme applying to activities on the basis of their environmental impact, it must be deposited more than 3 m from the boundary of the littoral zone for work carried out on a cultivated parcel and outside the lakeshore or riverbank in other cases;
(3) for the cleaning work covered by subparagraphs 2 and 3 of the first paragraph of section 335 of the Regulation respecting the regulatory scheme applying to activities on the basis of their environmental impact, it must be deposited more than 3 m from the top of the bank;
(4) it must not modify the topography of the site if it is deposited and graded in a flood zone, including the lakeshore or riverbank, where applicable.