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The tunnel is usually off-limits when it is filled and coursing with a massive stream of Colorado River water.

January’s fires and the heavy rains that followed sent unprecedented amounts of ash, debris and chemical residue coursing into the sea via the L.A. region’s massive network of storm drains and concrete-lined rivers.

Another farmer, David Lemon, said hare coursing has become like "guerrilla warfare" in his area on the Wiltshire-Hampshire border.

In the usual Santa Ana storms, most of that flow streams out of the desert, through mountain passes and into the valleys along predictable pathways, like water coursing down riverbeds.

"It wasn't pressure, it wasn't nerves. I had so much adrenaline coursing through me," Laugher told the BBC.