The Tenerife flood of 2002 (Spanish: Riada de Tenerife de 2002), also known as 31-M, was a flash flood caused by a cold drop that occurred in the Santa Cruz de Tenerife area of Tenerife, Spain, on 31 March 2002. 232.6 litres per square metre of rain fell in less than six hours, causing the deaths of eight people, and damage estimated at €20 million.