The Ontario Building Code | Wet Site Conditions
9.14.4.4. Wet Site Conditions
(1) Where because of wet site conditions soil becomes mixed with the granular drainage material, sufficient additional granular material shall be provided so that the top 125 mm is kept free of soil.
9.14.5. drainage Disposal
In Plain Language
Wet site conditions require additional drainage measures as set out in this article, addressing locations where standard drainage provisions may not be sufficient.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.