Wake - The wake of a vessel is the disturbed water and waves around and behind the vessel that are set in motion by its passage.
Wash - Wash is the broken or churned water left behind a boat as it moves along and includes the water thrown aft by the propeller (i.e. propeller wash).
Both types are inevitable in dragon boat racing where the lanes are very close and you have good/bad steersperson. If your team is relatively good, and you have a good steersperson, you can ride the wash of a leading team. If your steersperson sucks and your team is weak, then you end up eating wake. Every team has ridden wash to a certain degree, without knowing they're actually doing it.
