Advice on creating all weather turnout area

[horse_nut]

Please can I have your experiences and advice.
I am wanting to make an all weather turnout area, about 20m x 20m, as the winters are getting wetter and wetter.
2 quiet horses, they would not be fed in there and would be out for maybe 2 hrs at a time when we are having very wet weather in the winter. Plus doing in hand work .
The ground is flat, and is wet in winter, drains well in the summer.
I am thinking of
Weed kill grass and flatten any lumps in the soil
Put membrane down
Put subbase down and compact with a wacker plate. This is what we did for the drive, and it drains well. I was thinking MOT type 1 subbase? 4 or 6 inches.?
The turnout area would then be higher than the field.

I was thinking it would be nice to top it with sand, so they can roll, and it would give a better surface . Would this work, and what type of sand? How thick
Any advice or comments greatfully recieved. Thanks

 

[Errin Paddywack]

Just use Mud Control slabs with sand over the top. Absolutely brilliant and can take away if you move or need to change the area.

 

[horse_nut]

Thanks for your reply. I don't think the mud control slabs are suitable. When there has been days of torrential rain in the winter, there has been standing water, so the mud control slabs would be partly submerged. This would be the exact time that we would want to use the area.

 

[lamlyn2012]

If its that wet I would suggest digging out and putting in some drainage pipes but you would need somewhere to drain into.