2011/1/5 Steve Bennett <[email protected]>:
>  On 4/01/2011 7:20 AM, Paul Norman wrote:
>>
>> They both have elements of flow control, but function in quite different
>> ways and look very different. A weir is used to raise the water level or
>> control flow, with water flowing over the top. A sluice gate is
>> essentially
>> a valve for small waterways.


+1


> In this case, why not something like:
> waterway=weir
> weir=sluice_gate


-1
If I interpret the information from wikipedia correctly sluice_gates
are not weirs (they can be part of weirs). weirs are overflown, while
sluice_gates can be opened and then let the water flow underneath
them.

cheers,
Martin

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