Twain's pump house

Water still flows into the concrete catch basin. The pump house is located about 15 yards behind this structure to the left and down the hill a bit. I believe the water was pumped up the hill using a ramp pump. It was invented about 1770-1796. It uses gravity at the water source to push the water up hill through a pulsing action of the pump. I did not find the pump but hope to search with a metal detector in the near future.