790. The municipal inspector may authorize the opening of any trench or excavation in any public road, to allow a watercourse to pass through the same.
Such trench or excavation must be indicated, both by day and night, in such a manner as to prevent accident, under penalty of the damages occasioned.
Within 48 hours after the commencement of the work upon the road, a suitable and solid bridge or culvert of the width of the road must be built over such watercourse.