Regulations, Guidelines, and Environmental Assessments
Enter "drainage manual" in the search box to locate all the documents associated with the manual.
You can also download a PDF copy of the manual at this link: https://dr6j45jk9xcmk.cloudfront.net/documents/1757/195-stormwater-planning-and-design-en.pdf
This is a non-government website that includes the 2017 Ontario building code for reference.
e-Laws provides access to official copies of Ontario's statutes and regulations. An official copy of a statute or regulation is an accurate statement of the law unless otherwise proved. e-Laws is updated continually. New source law is usually published on e-Laws within two business days. The currency of each consolidated law on e-Laws is shown at the beginning of that law.