Tag:flow_direction=both
 flow_direction = both
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| Description |
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Indicates if the flow direction of a waterway or pipeline can reverse  
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| Group: properties |
| Used on these elements |
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| Requires |
Status: approved
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| Tools for this tag |
flow_direction=both can be used to indicate that the flow direction of a waterway or the content of a pipeline can be reversed. In the case of pipelines this happens by means of control systems, while in the case of waterways there may be various natural or man-made reasons for this.
One possible cause is tidal influence, which, depending on local conditions, can be noticeable in tributaries up to several dozen kilometers inland. For drainage/irrigation ditches in completely flat surrounding areas, the flow direction can temporarily reverse if the inflow/outflow is controlled by sluice gates. Another example is streams that are connected to an estavelle .
How to map
Add flow_direction=both to the affected section of a waterway=* or a man_made=pipeline. If the change of flow direction of a tributary is caused by tidal influence, add tidal=yes. For tidal channels being part of tidal flats use waterway=tidal_channel instead.