Tidal phenomena in Blackwater

DanTribe

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I noticed this report of a rescue in the RNLI log.

"Clacton-on-Sea’s Atlantic 75 lifeboat Robert George Alexander launched at 3.30pm after reports of a capsized dinghy off Point Clear.

While under way the crew were told that the dinghy crew had managed to right the boat and were ashore, but a call had been received from a twenty-six foot yacht with one man on board, had a fouled propeller near the Molliette beacon off Mersea Flats at the entrance to the river Blackwater.

On reaching her the crew found she had blown out her jib sail and the tender she was towing had capsized. She was in five and a half feet of water and in the ten minutes it took the crew to get a tow line secured the tide had dropped to three and a half feet, just enough water to pull her clear of the mud. The lifeboat took her into Brightlingsea."




Three and a half feet in 10 mins! Crikey, that's a range of about 130 feet. I'd better keep clear of that area.
 

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