Splish-splash Record number of river rats dive in for regatta Spirits were high, coolers were packed and tubes were inflated Saturday for the start of the 11th annual Wateree River Rat Regatta. A final total of 501 tubers registered for the event, delighting organizers. The regatta is a benefit for Lugoff-Elgin High School. ...For many river rats, the August ritual is a long-time tradition.