sentences:  Each boat crossing the summit level draws off nearly of water; Barnes knew that local water supplies would not be sufficient to sustain this.Wendover is located on the north-facing escarpment of the Chiltern Hills, with a chalk aquifer feeding natural springs which could supply water all year round, and so the Wendover branch was conceived as a non-navigable feeder, to carry water from the springs and streams in the area to the Tringford reservoirs which fed the Tring summit.However, the cost of widening it was small, and so it was always a navigable channel from the time of its completion in 1799.