On Thu, 24 Oct 2019 at 10:56, John Willis via Tagging <
tagging@openstreetmap.org> wrote:

Inside, there are three “retarding basins”  (numbered 1, 2 & 3), with #1
> having with a large traditional reservoir, parks, golf course, and sports
> grounds inside.
>

There is more to the system than that.  There are also underground holding
tanks and
tunnels: https://www.youtube.com/watch?v=cfJOW2PtrGk

-- 
Paul
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