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"
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