Summary
The rushing water created a new lake where two rivers meet.
Scientists are watching the lake with satellites and drones.
Rescue teams are checking the water level to keep nearby towns safe.
Flash floods formed after intense rainfall.
A barrier lake now holds about two million cubic metres of water.
Space images and flying robots help map the area.
Officials monitor the lake to prevent a sudden spill.
The rushing water created a new lake where two rivers meet.
Scientists are watching the lake with satellites and drones.
Rescue teams are checking the water level to keep nearby towns safe.
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