More on this story'Enormous' pressure blamed for maximum tax rise
Photograph: Simon Hill
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First, the pipes will be fed by new wide inlet heads, which slow the water so that fish are not sucked in. And to prevent fish swimming within two metres (6.5ft) of the intakes, the new acoustic system is being tested.
Equal (1): Everything in this purple space must be equal to 1. The answer is 1-4, placed horizontally; 3-1, placed horizontally.