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Assuming flow is available at even flow over the day then 125m3/day gives about 1.4lts/ sec. Power(in watts) = dynamic head (in m) x Flow (in lts/sec) x efficiency x 9.81 So assuming no pipe friction head loss and that the full 10m will be available (no residual pressure for other needs) then your flow and height will give about 100watts of continious power. Or 2.4kWHrs/day. Is this enough for your needs? A solar PV system might be easier since it is likely to be more readily available, more cost effective and easier to maintain.

Also in energy terms it would be better to tap the power from whatever is powering the borehole rather than having that pump push the water to the top of the tank. The borehole pump pumps the water from drawdown level to top of the tank but the proposed hydro only drops the water to the ground level.

If the tank is on a hill then uou could get more power by running the pipe down the hill. 20m drop would double your power.

I think more information is needed on the reasons for the tank, what powers the borehole, how much electricity you need (and when you need it), the water use profile during the day through the pipe, etc....