WI: Harrapan Irrigation system

So one theory for the collapse of the IVC (the Harappan Civilization)is that the slow eastward migration of the monsoons across Asia initially allowed the IVC to develop, but as the monsoons kept shifting eastward, the water supply for the agricultural activities dried up and the monsoon-supported farming of the Harrapan civilization resulted in the IVC being forced eastwards into smaller more spread out farming settlements that could not support the cities of old. So lets assume that this theory is correct and that the shifting migration of the monsoons led to the decline of the Harappan Civilization. Is there some form of irrigation that could have been adopted to save the IVC, perhaps Mesopotamian irrigation develops that prevents the need to move eastwards? With a surviving and much better off IVC what might occur then the Indo-Europeans arrive on the scene?
 
The climatic changes and desertification of the North Western part of India appears to be the main reason of the decline of the Indus Valley Civilization. From the literary sources of Rig Veda it is clear that a large river named Saraswati did flow to the east of Indus and it was the main base of the IVC. The drying up of Saraswati around 1900 B.C.E. dealt a deathblow to the IVC which disappeared from the scene around this time. The IVC had a highly developed drainage and water supply system in their cities. Why they couldn't develop a similarly efficient irrigation system to support their agriculture is a question that seeks an answer. They could have built canals to lead water from Indus and her tributaries. Or was their technology not sufficiently developed? Hard to imagine when many of their achievements in other fields are seen. As the writing system of IVC is not deciphered yet, mysteries still surround this extinct civilization.
 
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