There’s an interesting article about water shortages and the economics of Songkran festival in the Bangkok post. The Tourism Authority of Thailand (TAT) thinks that during the five-days of this famous festival more than 11 billion baht (around 378 million US Dollar) will be generated for the tourism industry, and 100 million baht (around 3,4 million USD) at Khao San Road alone.
On April 13 last year, people in Bangkok, Nonthaburi and Samut Prakan provinces consumed an additional 100,000 cubic metres of water _ presumably for splashing to celebrate Songkran. According to the Metropolitan Waterworks Authority (MWA), that amount of water was added to the tap water system. For the sake of comparison, that amount of water would need 8,333 12-tonne trucks for storage. If those 8,333 trucks lined up, the total length would be 100km _ the distance from Bangkok to Sara Buri province.