ICOLD criterion

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The ICOLD criterion decides whether a dam is a "large" dam.

The International Commission on Large Dams ( ICOLD / CIGB) maintains a register of the major dams around the world. You must meet the ICOLD criterion to get on the list.

A dam is a "large dam" if:

  • Height> 15 m or
  • Height> 10 m and [crown length> 500 m or
  • Storage space> 1 million m³ or
  • Design flood> 2000 m³ / s].

The national dam committees of each country report the large dams in their country to the ICOLD and are therefore responsible for them.

variants

According to another source (Discovery Channel), the 2nd rule is slightly different:

If a dam is 5 to 15 meters high and has a storage volume of over 3 million cubic meters, it is also considered a large dam. (By that definition, there are over 45,000 large dams worldwide, according to the Discovery Channel .)

The World Commission on Dams (WCD) offers a third version of the ICOLD criterion:

According to ICOLD, a "large dam" has a height of 15 m or more (above the foundation). If a dam is 5 to 15 m high and has a storage volume of more than 3 million cubic meters, it is also a "large dam".

According to this definition, there are over 45,000 large dams worldwide.

To the storage room

There are also variants for the storage space. However, it would also make sense to have the storage space in the event of flooding (with the HQ1000), which is also called total storage space .

Other definitions

"Large dams" in Austria are dams with a height above the foundation level> 15 m or a storage capacity> 500,000 m³.