Following from disbelief in a previous thread.
I found another covered reservoir whilst out on my travels at Conisborough, Doncaster
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What kind of sorcery is this?! 
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Don’t need them in Wigan
It’s always wet…
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I think it’s because we are so tight in Yorkshire they use lids to combat evaporation and birds drinking it
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Theres a covered one in london with a golf coarse on top called the aquarious golf club