Surface irrigation is within the scope of WikiProject Soil, which collaborates on Soil and related articles on Wikipedia. If you would like to participate, you can choose to edit this article, or visit the project page for more information.SoilWikipedia:WikiProject SoilTemplate:WikiProject SoilSoil articles
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I do not think this subheading should be located on this page. The rest of the page is talking about irrigation while this section is focussing on a type of drainage.
It has been some time since I posted this message and as I have had no objections from others I will remove this section
