Glory Drain Hole
1- It is called "GLORY DRAIN HOLE" Glory holes are used for dams to drain excess water during dry seasons.
2- This one is the largest in the world, it is located in Lake Berryessa.
3- It is used very rarely, but it is quite a sight to see it being put to use.
4- Located in Napa County, California, USA this glory hole was constructed between 1953 and 1957.
5- The hole diameter is 72ft (22m) wide whilst the critical drop is 280ft (86m).
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