Currently the UK experiences about seven days a year where rainfall is more than 80mm a day – considered a heavy rainfall event. If 30mm of this falls in an hour it typically triggers a flash flooding warning.
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Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).