Water scarcity is a region lack of sufficient fersh water resources Types of scarcity PHYSICAL WATER SCARCITY, It is occur when natural water resources are physically insufficient. This is common in arid regions like North Africa and central Asia, ECONOMIC WATER SCARCITY, It is occur when water is naturally available but cannot be accessed due to poor management, lack of investment in infrastructure. This is a major issues in parts of sub-saharan Africa.