sentences:  This put an extra load on the pumps at Tringford, as the Wilstone reservoir is at a lower level than the Tringford one.A pipeline was therefore laid from a sump at Drayton Beauchamp to the Tring pumping station, along the bed of the disused canal, so that water arrived at the pumps at a higher level.The new system was still not satisfactory, due to the large variations in flow along the feeder, and it was redesigned in 1912.