To that we can add that one in every four years is very dry and that one year in every ten years is even dryer. There has to be planning for when there is a drought or a worse situation. When the land is well planted with trees, these reduce the speed of water precipitation. They increase soil permeability, and they also help reduce erosion and sedimentation in the dams. This causes floods and landslides which are fatal in rainy seasons.
Vegetation is what makes soil permeable.
When the water gets into the soil, natural water springs come out of the soil. We have to control deforestation. We have to implement intensive and extensive reforestation programs. Dredging would also stop floods. We have to educate the population to make it conscious of the critical importance of our natural resources.