218. Unless otherwise provided for, for the purposes of this Division,(1) “culvert” does not mean a culvert laid out in a watercourse;
(2) “ditch” does not include a swale, a percolation trench or a grassed ditch;
(3) “grassed ditch” has the meaning given by the Design code of a storm water management system eligible for a declaration of compliance (chapter Q‑2, r. 9.01); (4) “high-risk site” means one of the following sites, when exposed to the elements:(a) a landfill site;
(b) a site where industrial activities likely to contaminate storm water are carried on;
(c) an outdoor bulk storage site;
(d) a site where hazardous residual materials, chemical products or salts are loaded or unloaded;
(e) a site where activities to repair, refuel or clean heavy vehicles are carried on; or
(f) a site where vehicle recycling, long-term storage, crushing and shredding activities are carried on;
(5) “discharge point” means a place where wastewater or storm water is discharged into a wetland or body of water, but not a place where storm water is discharged into a ditch or sewer system;
(6) in addition to what is required by section 174, modifications to a storm water management system include(a) work performed in a ditch, including the installation of a pipe, manhole, catch basin or culvert in a ditch;
(b) work performed on a retaining works;
(c) the addition of a pumping station;
(d) the addition, to an existing system, of equipment, an accessory, a device or a works to manage or treat storm water;
(e) the replacement of an existing pipe by a ditch;
(7) a watershed is delimited using the Base de données topographiques du Québec at a scale of 1:20 000;
(8) the area of forest cover is calculated using the most recent forest cover map in the ecoforest information system;
(9) the establishment and extension of a storm water management system discharging into Rivière des Mille-Îles are not exempted.