Under various drivers, such as, climate change, population increase, and bad management, water storage of many WRS is decreasing, say per decade. This means that the volume of water in a WRS decreased after a decade, i.e., inflow was less than outflow during that time interval.
Under various factors, such as climate change, population growth, and poor management, water storage in many reservoirs is declining at a rate of one per decade. This implies that the volume of water within a reservoir decreases after a decade, meaning inflow was less than outflow during that time period.