Ottawa : Règlement no 2013-416, art. 82 — Property Standards By-law

1) Rain water from a roof area of 46.5 m (500 sq. ft.) or more of a vacant building shall be conveyed to a storm sewer, and if such a storm sewer is not available, the rain water shall be disposed of in such a manner as not to create a nuisance. 2) Roof drainage or surface water, in relation to a vacant building or vacant land, shall,

• a) be drained from the lands so as to prevent recurrent ponding or entrance of water into a basement or cellar; and
• b) not be discharged on walkways, stairs, or neighbouring property. 3) Subsurface drainage in relation to a vacant building or vacant land shall be installed where there is recurring excessive ponding caused by surface water. BY-LAW NO. 2013-416 4) Catch basins on land appurtenant to a vacant building or on vacant land shall be kept in good repair and free of debris and obstructions which would prevent them from functioning properly. 5) Where heat is not provided in a vacant building and if the outside temperature is likely to reach freezing, water systems shall be drained. ACCESSORY BUILDINGS AND OTHER STRUCTURES