Friend sent me this, he went past it on his bike an im miffed as well. Anyone have a clue? https://www.google.co.uk/maps/@51.8752657,-0.8227113,224a,20y,90h,45t/data=!3m1!1e3?hl=en
Unlikely given it's raised My guess would be some sort of caravan site or a pitch for numerous different sports.
Its an irrigation reservoir but not used. There is a similar one near me that is in use. https://www.google.co.uk/maps/@53.2253829,-0.4207403,469m/data=!3m1!1e3
You'd be surprised, earth covered above ground reservoirs are quite common, and make really nice homes if you can buy a disused one.
I'm not convinced. The one in the OP is simply a flat surface which is raised. The other one that is linked has raised edges but is still lower in the middle.
The OPs isn't an irrigation reservoir, it's an earth covered above ground one in the same style as this http://www.bbc.co.uk/news/uk-england-35473995
I'm a bit late to the party, but as someone who works in the water industry I can confirm you are correct sir(s)!