Simon Clark from Chorley Council said it was keeping a close watch on the River Yarrow's high tide at 20:30 BST.

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The Environment Agency said that during periods of high tide, high river levels would be unable to discharge into the sea, which was likely to lead to localised flooding at Surfleet reservoir.

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Flood-tide delta: accretionary deposit of sand found on the bay or river side of an inlet and usually formed by tidal currents.

UNESCO: L O S S A R Y

To the east was a tidal strait (the East River) teeming with striped bass, blackfish and fluke that came in with each replenishing tide.

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Tidal inlet: a river mouth or narrow gap between islands, within which salt water moves landwards during a rising tide.

UNESCO: L O S S A R Y