Natural springs in the Senchal Range provide most of Darjeeling's water supply. Water collected is routed through stone conduits to two lakes that were constructed in 1910 and 1932, from where it is piped to the town after purification at the Jorebungalow filtration plant. During the dry season, when water supplied by springs is insufficient, water is pumped from Khong Khola, a nearby small perennial stream. Increasing demand has led to a worsening shortfall in water supply; just over 50% of the town's households are connected to the municipal water supply system. Various efforts made to augment the water supply, including the construction of a third storage reservoir in 1984, have failed to yield desired results.