Ottawa : Règlement no 2013-416, art. 41 — Property Standards By-law

1) Sanitary sewage or organic waste shall be discharged only through the building drain and building sewer into a sewage system. 2) Rain water from a roof area of 46.5 m (500 sq. ft.) or more 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. 3) Roof drainage or surface water 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. 4) Subsurface drainage shall be installed where there is recurring excessive ponding caused by surface water. BY-LAW NO. 2013-416 5) Catch basins shall be kept in good repair and free of debris and obstructions which would prevent them from functioning properly. SAFE PASSAGE