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Prof. Terry Thomas is still the best point of reference I know - he is I believe still active at the DTU in the University of Warwick but more involved with low cost rainwater systems. Viz: https://www2.warwick.ac.uk/fac/sci/eng/research/civil/crg/dtu-old/rwh/pubs/

He can be contacted via the link at the bottom of that page.

Hydrams are great! I think COFORWA in Rwanda may still make them - I have a contact there if you need one - just PM me.

I also have some friends who made one from standard parts in the UK and sent it out to Kenya to some friends we have in common. I think a local chap was gpoing to start to make them but I have not heard any more about that.

Where in the world are you/ where is the application for? I have found something I downloaded from an ACF website some time ago but it is too big too attach through this website. You can find it here: https://recette-acf.jouve-hdi.com/sites/default/files/publications/fichiers/module_6_-_hydraulic_ram_pump_system_2009.pdf There are several modules in that series - this is number 6. Well worth a read.

Also Google this term: ram pumps filetype:pdf and you will find a lot more information.

There are manufacturers of Ram Pumps in the UK:

Blake/Allspeeds https://www.allspeeds.co.uk/blake-hydram/water-powered-pumps Green & Carter https://www.greenandcarter.com/ Aries https://ariesrampumps.org.uk/products.html.

All the best,

Steve