70bar.. over 1000psi. Wow!
This is a completely NON-trivial design. To have even a hope of making this work you need to provide:
Height the water must be raised. +/- 10 meters. (Use a GPS with altitude capabilities.)
Length of pipe for the entire run that's needed. +/- 30 meters. (Use a 50m tape and hike it with help.)
Estimated peak water use at the peak consumption point of the day.
Estimated daily water requirement. This can come from estimated use by a household x number of households. If they're crudely carrying water up and down hills now take what they're using and multiply it by 10 because of the increased convenience as LI mentioned.
Check if line-of-site communications can work. Running control wires that far is fraught with issues, especially somewhere that lightning occurs. A simple radio link between the upper tank and the lower pump system is a superior solution if it's viable. (Use walkie-talkies to determine if top to bottom communications is possible. Test them out to 1km on flat ground to know if they can cover the 700m distance.)
With this info we can actually devise a functional optimal system.
Anything to add to the list folks?
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Consideration should be given for solar power as carting around and burning fuel to do this is a giant waste of more time, money, and a potential pollution source around drinking water. Is there the possibility of installing some solar panels somewhere? Ideally at several stopping points up the hill.
Consideration should also be made for catching rain and storing it instead or to greatly reduce the pumping needed.
A thorough survey of the surrounding area should first be made as even a tiny creek trickling down the hill could supply all the needed water. A source 2km away but at the same or higher elevation would be vastly cheaper to harness than the one being contemplated now.
Keith Cress
kcress -