On Sat, 23 Feb 2019 at 23:33, Hufkratzer <hufkrat...@gmail.com> wrote:
> On 23.02.2019 18:47, Paul Allen wrote: > > [...] As I see it, ditches are unlined. [...] > > > I googled for "ditch lining irrigation" and got these examples for lined > ditches: > > - > http://www.northwestlinings.com/services-available/installation-services/irrigation-ditch-liner-system/ > - http://www.skidmarkgeomembrane.com/Ditch-Lining.html - Irrigation Ditch > Lining > - http://www.smartditch.com/markets-agg-irrigation.html - "SmartDitch" > They all appear to be conversion kits. For people who did their irrigation on the cheap and used a ditch to deliver the water to the irrigation ditches instead of using a drain and then found they were losing too much water. You can get away with a ditch for delivering irrigation water, but it will be inefficient. You can't use a drain at the edge of a field to lower the water table. Yes, we can merge the tags and have drain for both. And then have to create a lined=yes/no subtag to differentiate. Or we can use, as some suggest, ditch for narrow and drain for wide, and then have to create lined=yes/no and width=n (which might be useful anyway). It seems silly to move away from UK usage of ditch/drain and introduce ambiguities that we then have to resolve a different way. YMMV. -- Paul
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