 They are held on Sundays at fortnightly intervals starting 8 weeks from Easter and the races are progressively longer in distance.It is common to use the Waterside Series as a warmup event for the longer, 125 mile Devizes to Westminster International Canoe Marathon, however despite the reputation as a warm-up event, it is considered a gruelling challenge in its own right.The races take place as a time trial format, whereby competitors choose their own start time within the start window and must finish within the finish window.