Originally , the delta used to receive almost all of the water from the Indus river , which has an annual flow of approximately , and is accompanied by of silt . Since the 1940s , dams , barrages and irrigation works have been constructed on the river Indus . The Indus Basin Irrigation System is the " largest contiguous irrigation system developed over the past 140 years " anywhere in the world . This has reduced the flow of water and by 2018 , the average annual flow of water below the Kotri barrage was , and annual amount of silt discharged was estimated at . As a result , the 2010 Pakistan floods were considered " good news " for the ecosystem and population of the river delta as they brought much needed fresh water . Any further utilization of the river basin water is not economically feasible
2010 Pakistan floods
2010 Pakistan floods
Indus River