Under buildings this heavier walled pipe is mandatory. Only fittings required by B.C. Plumbing Code can be used. Joining of horizontal pipes may be accomplished by the use of 45 degree elbows or Wye and 45s. Joining of a downspout to the horizontal collection pipe shall be accomplished by the use of a Wye and 45 degree elbow. The storm drainage system may be installed at higher elevation than the drain tile.
All joints are to be glued and made watertight.
The completed work has to be inspected by a Plumbing Inspector. Floor Drains Floor drains in basement are to be connected to the sanitary drainage system or the storm drainage system. Crawl space drains shall be connected to the storm sump only. Catch Basins Catch basins are installed to collect runoff from exterior paved surfaces, like driveways, and provide an intercept for sand and grit which would otherwise be washed into the storm drainage system. They shall be connected to the storm drainage system, not the drain tile.