High Quality Content by WIKIPEDIA articles! The Boscastle flood of 2004 occurred on Monday, 16 August 2004 in the two villages of Boscastle and Crackington Haven in Cornwall, England, United Kingdom. The villages suffered extensive damage after flash floods caused by an exceptional amount of rain that fell over the course of eight hours that afternoon. The flood in Boscastle was filmed and extensively reported but that in Crackington Haven was not mentioned beyond the local news. The Boscastle flooding was caused by rainfall which the river could not hold. The floods were the worst in local memory. A study commissioned by the Environment Agency from hydraulics consulting firm HR Wallingford concluded that it was among the most extreme ever experienced in Britain. The peak flow was about 140m³/s (tonnes), between 5:00pm and 6:00pm BST. The annual chance of this flood in any one year is about 1 in 400. The probability each year of the heaviest three-hour rainfall is about 1 in 1300.