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Read the following passage and answer the following questions: About the drains, Mackay noted: 'It is certainly the most complete ancient system as yet discovered.' Every house was connected to the street drains. The main channels were made of bricks set in mortar and were covered with loose bricks that could be removed for cleaning. In some cases, limestone was used for the covers. House drains first emptied into a sump or cesspit 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. It is a wonder of archaeology that 'little heaps of material, mostly sand, have frequently been found lying alongside drainage channels, which shows ... that the debris was not always carried away when the drain was cleared'. Drainage systems were not unique to the larger cities, but were found in smaller settlements as well. At Lothal for example, while houses were built of mud bricks, drains were made of burnt bricks.
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