The embankment beside Palmerston Street aqueduct, pictured below is quite unique in its construction. It is built entirely of rock, the most readily available material around here. There is no other on the British waterway network like it. Most embankments are built mainly of earth, often that which has been excavated from nearby cuttings. Earth embankments tend to have flatter profiles with a maximum slope of 2:1 (33%).
Building with rock enables a steeper sided profile and ours is 1:1 (50% or 45deg).