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The most unique aspect of planning during the Indus Valley civilization was the system of underground drainage. The drains were covered with slabs. Water flowed from houses into the street drains. The street drains had manholes at regular intervals. Housewives were expected to use pits in which heavier part of the rubbish will settle down while only sewerage water was allowed to drain off. All soak pits and drains were occasionally cleaned by workmen. In every house there was a well-constructed sink, and water flowed from the sink into the underground sewers in the streets. This elaborate drainage system shows that the Indus Valley people were fully conversant with the principles of health and sanitation.