At the time of independence, the boundary line between the two newly created independent countries i.e. Pakistan and India was drawn right across the Indus Basin, leaving Pakistan as the lower riparian.
The S.W. monsoon or summer monsoon is a major event in the agricultural life of India, which has been widely studied. The chief characteristic of the pressure distribution over India during the monsoon is the trough of low which extends from the the S.E. Punjab to the head of the Bay and the concomitant high pressure belt in the Indian Ocean.