I've never actually had to drain down an area like this before . My experience is telling me to take levels all over it , find the low spots and run drainage from the burn to these low spots . What I don't know is would cutting the reeds down with flail help to drain it at all . I'm not a big fan of wavin coil pipe as it gets used for applications where it shouldn't in my opinion, but I am wondering would it be the right thing to go for in this instance . keeping the trenches narrow as possible and filling to the surface with 40mm drainage stone. Topsoil is about 300-450mm deep and then sandy clay . Another option would be cut V ditches all through it and leave them open so I can monitor where the water is mostly coming from . The disadvantage of this is access between the ditches whilst it is drying down would be a pain .
my thought is dry out the low lying areas first as I can't tell wether they are wet because the ground lies lower than the burn so surface water doesn't run off or wether springs are keeping them constantly wet .
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