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Flash Flooding
Flash flooding in Pittwater, Sydney northern beaches Flash flooding usually occurs in the headwaters and results in rapid rises in water over a short period.
Especially in places where the land is steep and close to the headwaters of watercourses or streams, flooding can happen within a few hours or less of heavy rainfall and is called flash flooding. Although a warning of the chance of heavy rain might be possible, the arrival time and depth of floodwater cannot normally be predicted. Flood depth can be many metres above the ground level but flooding does not last more than a few hours. It is often safer to stay inside a house than risk getting swept away in floodwater outside.
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