Here is a picture of the creek in question:
seen on gardening / tracking-of-the-growth-of-a-crop-of-the-garden-miscanthus-t5256.html
To begin, a few pages for the basics of operation: https://www.econologie.com/plans-realis ... draulique/
supplements: http://www.codeart.org/technique/eau/be ... que_fr.htm
Edit after a few weeks: here is the result of this step.
ps: the reliability of the ram (defusing after 4 or 5 days) was obtained by drilling a small air intake hole (breather) of 1.5mm after the valve and before the reserve of air. A hole of 0.5mm or 1mm would probably suffice. This breather is COMPULSORY if you do not have a membrane at the air supply because the compressed air eventually dissolves in the water. It must therefore be renewed constantly.