sent from a phone

> On 4. Jun 2019, at 17:09, Peter Elderson <pelder...@gmail.com> wrote:
> 
> There is no main usage, except keeping water levels in all parts of the 
> polders within very narrow range



this seems to be a very distinct usage, albeit not only irrigation or drainage 
but both. Maybe usage=regulation or gauge_regulation? or usage=polder / 
polder_management? 

Cheers, Martin 
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