One of the toughest events for athletes as the barriers constantly interfere with the tempo of running.
A 3000m steeplechase comprises 35 barriers, five for each lap with seven water jumps (one per lap).
The barriers are 91.4cm high for men and 76.2cm for women.
Each water jump is 3.66 metres long and has the same width.
The deepest part of 70cm is closest to the barrier, with the bottom sloping up towards the running level.
Each barrier weighs 80-100kg.
A lot of athletes place their feet on the water jump barrier so as to provide an extra push over the water.