"Public baths (probably often part of temples), private baths for most inhabitants, sewerage through underground drains built with precisely laid bricks, and an efficient system of water management with numerous wells and reservoirs testify to the care that was taken of the ordinary inhabitant. Mohenjo-daro, for instance, probably had over 700 wells, some of them fifteen metres deep, built with special trapezoid bricks (to prevent collapse by the pressure of the surrounding soil), and maintained for several centuries; quite a few of those wells were found in private houses. Dholavira had separate drains to collect rain water and six or seven dams built across nearby streams (apart from several large reservoirs located in the lower town)."