It's important to remember that it doesn't take very long to fill or drain reservoirs, it's all about inflow versus outflow. Inflow and outflow (consumption in

It's important to remember that it doesn't take very long to fill or drain reservoirs, it's all about inflow versus outflow. Inflow and outflow (consumption included) need to be both stable and relatively close in order to maintain a stable water supply, and that's not the case here; outflow usually massively outpaces inflow, and decade-long droughts interspersed with full reservoirs after torrential rains is not a reliable or secure way to ensure water access.