The Tourism Authority of Thailand describe it as follows;

Songkran, is the ''Thai New Year''. Calculated by the lunar cycle, this year's date fell on April 13. Shortly after dawn, devout Buddhists gather at the neighborhood temples to offer food for the monks and prayers for the New Year. By mid-morning, though, the town degenerates into a battlefield as the good people of Songkhla abandon themselves to a mad ... (more)