Schedule 3, Part 4, paragraph 20(2)

For the purposes of this paragraph, the specific conditions are— the construction does not affect the structural integrity of the existing impoundment, construction of the notches does not change the water level in the main river by more than 20cm upstream or downstream from the existing structure, the existing impoundment is located on a main river with a width of no more than 5 metres measured between the top of each bank, the construction does not adversely affect the banks or established bed of the main river, and the notch is no more than 0.6 metre in width.

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Source: legislation.gov.uk · retrieved 2026-07-30