"We're asking folks to observe low-water crossing (warnings), to use common sense and to stay off the road if possible, " Mayor Julian Castro said.

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"We're likely to see a dramatic increase now in drownings and other kinds of water fatalities and other kinds of danger associated with crossing in the water, " he said.

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On Sunday, three people escaped from a car which was overwhelmed with water while they were crossing a ford at Mountjoy, near Newquay.

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Egyptian riot police stopped the people from going through the crossing and fired water cannons at the demonstrators, witnesses said.

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Although she had swum regularly for nearly 25 years, Ms Sherr realised she had to improve her efficiency in the water if she was to complete the Hellespont crossing.

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Later on, due to the crossing taking longer than expected, Allen's water supply would run out leaving him dangerously dehydrated and contending with leg cramps -- far from ideal when pedaling across the English Channel.

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On the way into town from the lakeside border crossing with Rwanda, hundreds more people have gathered at a water distribution point.

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Crossing expanses never remotely surveyed, they will gather 2.25 million data points about salinity, water temperature, waves, weather, fluorescence and dissolved oxygen.

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