[Tagging] tagging extremely large flood control features.

[Graeme Fitzpatrick]

In a *much* smaller way, we've got a similar area just near us, where an
area has been built to be filled with flood water after very heavy rain. I
think it's probably only filled 3-4 times in ~15 years since it was put in.

Some photo's, wet & dry!

https://ibb.co/SdVF7kt
https://ibb.co/4N3mWzQ

https://ibb.co/S0Rzqtr
https://ibb.co/bF4Pf2g

There is actually a 1m flood depth sign that should be visible in the
middle of that last shot, so it's about 1.2 - 1.5m deep out there.

It's here:
https://www.openstreetmap.org/way/538666044#map=18/-28.07363/153.42448

I mapped it as:

natural=water
water=basin
basin=retention
intermittent=yes
description=After heavy rain only

which seems to cover it all nicely?

Thanks

Graeme
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