The drainage system in Harappan cities indicates town planning because:
(i)The road and street were laid out along an approximate grid pattern.
(ii) The streets and drains were laid out first and then houses were built along them. All domestic waste water had to flow into the streets, every house needed to have at least one wall along the street.
(iii) Every home was connected to street drains. The main channels were made of bricks set in mortar and were covered with bricks that could be removed for cleaning. lt,brgt (iv) House drains first empticd into a sump or cesspit into which solid matter settled, while waste watcr flowed into street drains
(v) Very long drainage channels were provided at intervals with sumps for cleaning. It is important tonote that drains were found in smaller settlement too, such as Lothal.
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