Two neat videos from Approtechie on pvc pumps that can be made. He shows in the second video a pump that he says will pump 50 gallons per minute. This could come in handy off grid or possible even down the road sometime.
Simple PVC Hand Pump
4-inch PVC Handpump, 50 gal/min!
Hand and power pumps for all uses; cistern and force pumps, well pumps and cylinders, spray pumps and nozzles, hydralic rams and pneumatic water … pumps, air compressors and pumps for spe
Smart Water Solutions: Examples of Innovative, Low-Cost Technologies for Wells, Pumps, Storage, Irrigation and Water Treatment (Smart Solutions Series)