12th Class History Solved Paper - History 2017 Delhi Set-III

  • question_answer Describe the drainage system of the Harappan cities.

    Answer:

    The most distinctive feature of Harappan cities was the carefully planned drainage system. In the lower town the roads and streets were laid out along an approximate grid pattern, intersecting at right angles. If the domestic waste water has to flow into street drains, every house needed to have atleast one wall along a street.
                Every house was connected to the street drains. The main channels were made of bricks set in mortar and were covered with loose bricks or lime stones that could be removed for cleaning. House drains were first emptied into a sump or cess pit into which solid matter settled while waste water flowed out into the street drains. Very long drainage channels were provided at intervals with sumps for cleaning. Drainage systems were not unique to the larger cities but were found in smaller settlements as well.


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