There are alcoves every 500 meters ( 1,600 ft ) to facilitate turning around .
The storage capacity for water leakage is 2,000 cubic meters ( 71,000 cu ft ) .
There are alcoves every 500 meters ( 1,600 ft ) to facilitate turning around , and the storage capacity for water leakage is 2,000 cubic meters ( 71,000 cu ft ) .