101. The minimum discharge capacity that a culvert must possess is determined on the basis of the peak flow calculated using the method provided for in Schedule 6 for drainage basins having an area equal to or less than 60 km2 or in Schedule 7 for drainage basins having an area greater than 60 km2 and on the basis of the size of circular conduits provided for in Schedule 8. Conduits that are not circular, arches or bridges must have a discharge surface sufficient for a peak flow calculated using the method provided for in Schedule 6 or 7, as the case may be, and so that the water depth is at all times less than or equal to 85% of the vertical clearance of the structure.
Every person authorized to build or improve a bridge or a culvert must, at the request of the Minister, give to the Minister within 48 hours of the request the calculations of the peak flow performed prior to the work. The foregoing also applies to a person who repairs a bridge or a culvert.