Re: 200,000 people affected by floods in interior Sindh: NDMA
That is called barrages, lakes natural or man made lakes which store and regulate water. Examples in Sindh are Kalri aka Kinjhar and Machar, Sukkur, Guddu and Ghulam Mohammad barrages, which store water and regulate, when Indus river is high in floods due to rains or otherwise.
For dams you need sharp gradients to store water at considerable height, which can produce electricity too. Sindh is mostly flat land except few patches in Dadu and Sehwan districts. Hub Dam is another example of storing rain water at height which can store and produce electricity. Otherwise it does not have other source of water.