On 28 April 2012 16:14, Malcolm Herring <[email protected]>wrote:
> In many European canals, the convention is for the waterway authorities to > arbitrarily define a direction so that a 'left' and 'right' bank can be > defined and the appropriate navigational marks installed. So in those > cases, where you see red on one side and green on the other, the nominated > 'direction' can be deduced. If you face in the direction that places the > red marks on your right & green marks on your left, then you are facing > downstream. > > That's a good point. I never checked the navigational marks, to be honest. I only know from what is written in Wikipedia or similar sources that they are bidirectional. The purpose is that they can direct the water according to need, in particular for irrigation purposes. Volker
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