The metropolis of nearly 22 million people is facing a severe water crisis as a tangle of problems — including geography and leaks — are compounded by climate change.
You don’t have all the time an aquifer under a lake. You can find lake on impermeable soil, for example. If connected to an aquifer, you still have some sort of soil between the lake and the aquifer. They drained the water of the lake and the soil when solid at the air. This is why if the aquifer is too low, you have a risk of collapsing.
With urbanization, they build houses, buildings, later parking, paved streets, etc. Each of them is sealing the ground. The water flow in the storm water canals out of the city instead of going in the aquifer. You have a similar issue all over the world.
One project is to use the water in the storm water canals, treat this water and store it in multiple man-made structure like reservoir. We mostly all use man-made structure for water distribution in the developed world. The issue with putting the treated water in the aquifer is that if the treatment went wrong, it contaminates the entire aquifer. The entire aquifer would be unusable.
You don’t have all the time an aquifer under a lake. You can find lake on impermeable soil, for example. If connected to an aquifer, you still have some sort of soil between the lake and the aquifer. They drained the water of the lake and the soil when solid at the air. This is why if the aquifer is too low, you have a risk of collapsing.
With urbanization, they build houses, buildings, later parking, paved streets, etc. Each of them is sealing the ground. The water flow in the storm water canals out of the city instead of going in the aquifer. You have a similar issue all over the world.
One project is to use the water in the storm water canals, treat this water and store it in multiple man-made structure like reservoir. We mostly all use man-made structure for water distribution in the developed world. The issue with putting the treated water in the aquifer is that if the treatment went wrong, it contaminates the entire aquifer. The entire aquifer would be unusable.