What does “By-Pass” Mean?

Definition of By-Pass in Construction
A by pass describes any piping system that is installed to provide an alternate route for an established system, to enhance the ability of a contractor to construct a new system. For example the use of a sanitary by pass when replacing existing sewer lines and sanitary manholes, is normally a good idea, to prevent the contamination of the new system with the old sewage during the construction, or to eliminate the possibility of a backflow of sewage into residential properties. The use of a by- pass system, although more costly and time consuming, is usually a good insurance policy for the municipality engaging the work, as well as the contractor hired to perform the work. In some instances in an effort to be competitive, the contractor will eliminate a by- pass option in the bidding procedure. This can be a very dangerous decision and should be clearly identified when presenting the bid.