![]() There was simply too much water for this small river and the surrounding hillside to cope with, and the water gushed rapidly down the steep slopes into Boscastle. A small, steep river flows through Boscastle and the thundery showers came one after another in a short space of time, over the same spot at the head of the river. Heavy thundery showers developed over the moors to the southwest of Boscastle. The village of Boscastle in Cornwall experienced flash flooding on 16 August 2004 when an exceptional amount of rain fell over eight hours. This leads to surface overflow and can often overwhelm local drainage systems, leading to flash flooding. It can also occur from small rivers in built-up urban areas, where hard surfaces such as roads and concrete don't let the water drain away into the ground. With flash flooding, there is often very little time between the rain falling and flash flooding occurring.įlash flooding commonly happens more where rivers are narrow and steep, so they flow more quickly. ![]() Therefore, when a river floods it does so quite slowly as it takes time for the rain to percolate through the ground and into the rivers and out to sea, allowing time for some warning. Most rivers flow fairly gently as they slope slowly towards the sea. Flooding Hazardous hydrological events resulting in temporary inundation of land areas not normally covered by water, often caused by excessive rainfall. So, if the rain is falling too fast for the ground or drains to cope, there is a risk of flash flooding. Areal flood warnings are issued when flooding is occurring over a large area or when significant flooding is expected to occur. A flood warning means that flooding is already occurring or will occur shortly. Roads can become like rivers and if there is a lot of water, it can flood buildings and carry cars away. A flood watch implies that situations are satisfactory for flooding to happen. Flash flooding happens when rain falls so fast that the underlying ground cannot cope, or drain it away fast enough.
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