Abstract
Mohenjo-Daro is widely known as one of the largest cities of Indus Civilization and with its numerous brick-made structures. In particular, its drainage system is unique among the other remains flourished at the same period of Mohenjo-Daro. As yet, this system has been interpreted as simple sewer based on the results of past archaeological researches, however few researches with the engineering point of view have been made. Therefore, the authors approached to its water supply-drainage system with the civil engineering view and tried to investigate the original purposes of the drainage system. This supply-drainage system includes some pieces of software such as water supply capacity, rainfall intensity, and water use form and also hardware such as sewer, well, and soak-pit. As a conclusion, this drainage system seems to have been made mainly for the removal of waste water from floor-paved rooms near wells.
