Reducing water flow speed on cross-gabled roof

23 Jun 2008
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United Kingdom
We're having an issue that when it rains heavily the flow in the valley between the two roof sections is fast enough that it overshoots the gutter and splashes onto the patio below. This is splashing onto patio doors and causing a problem with water ingress.

Roofing and guttering is not my subject so I'm looking for some advice on what to do about it. The guttering appears to be fitted correctly, no drooping, correct fall to down pipes.

What I would like to know is if there are flow disruptors that can be fitted in the valley to slow down the flow of water, or another solution?

Thanks in advance.
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