327. The construction of a culvert with a total opening of no more than 4.5 m is exempted from authorization pursuant to this Division on the following conditions:(1) the culvert is designed in a way that ensures that the design length is based on the width of the road or railway;
(2) the culvert has no more than 2 parallel pipes;
(3) the culvert is covered by fill no more than 3 m thick;
(4) the work is limited, in the littoral zone or on a riverbank or lakeshore, to a zone no wider than twice the length of the culvert, upstream and downstream from the culvert.