{HEAD ~ Actuation} of the piston heads serves to force water under pressure through a suitable discharge pipe to a remote location such as {TAIL ~ a reservoir} where the water can be converted into a usable form of energy 
{ HEAD ~ Actuation } of the piston heads serves to force water under pressure through a suitable discharge pipe to a remote location such as { TAIL ~ a reservoir } where the water can be converted into a usable form of energy
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH