Waste weir

A canal constantly consumes water due to leakage, evaporation, and the operation of lift locks.

For instance, on the Morris Canal, the Lopatcong Creek went into the canal to feed it, but it had a tendency to flood, hence the need for a couple of waste weirs in the area around the bottom of Inclined Plane 9 West near Port Warren, New Jersey (near Strykers Road today).

[7] Various values of Cd can be given as follows:[8] Construction methods varied depending on the canal.

Since a waste weir was part of canal property, it would sometimes be explicitly protected by law.

On the Morris Canal, New Jersey Statue 136 section 61 stated that for willfully and maliciously opening the gates of waste weirs the penalty was $25.