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i. Mackay has described this system as a complete ancient drainage system because it was unique, well planned, clean and systematic. It was just like the contemporary civilization especially the drainage system. 2
ii. Yes, drainage systems were similar in large and small settlements of Harappa. For example, in a small settlement like the Lethal drainage and a large city like Mohenjo Daro.
iii. The features of the drainage system were:
a) Every house was connected with the street drain.
b) The main channel was made of brick set in mortar and was covered with loose bricks that could be removed for cleaning.
c) In some cases, limestone was used for the covers.
d) House drains first emptied into a specific cesspit into which the solid matter settled while the wastewater flowed down into the street drain.
e) A very long drainage channel was also provided at intervals with sumps for cleaning
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