What the Harappans Also
The Harappan civilisation (2500-1900 BC) comprised a number
of urban centres. Dholavira, in the great Rann of Kutch (in
present-day Gujarat, western India), is one of them.
The city was built in a semi-arid region averaging 260 mm
rainfall annually. There were no perennial water sources.
Subterranean water was saline, potable water scarce. How did
Two storm water channels, Manhar (north) and Mansar (south)
flanked the city. The city was laid out on a 13 m gradient
(higher in the east to lower in the west), ideal for reservoirs.
It seems the planners knew this. They made a series of 16
reservoirs between the inner and outer walls of the city to
collect the monsoon runoff from the channels, which amounted
to 250,000 cu.rr. of water.
Inside the citadel (inner city), there are large storm drains
with apertures. These were not for wastewater, as archaeologists
first thought, since they were not connected to housing or
bathing platforms. These were for rainwater. The air-apertures
ensured easy passage of rainwater.