The Karun-3 dam is a hydroelectric dam on the Karun

Karun

The Kārun is Iran's most effluent, and the only navigable, river. It is 450 miles long. It rises in the Zard Kuh mountains of the Bakhtiari district in the Zagros Range, receiving many tributaries, such as the Dez and the Kuhrang, before passing through the capital of the Khuzestan Province of...

 river in the province of Khuzestan, Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

. It was built to help meet Iran's energy demands as well as to provide flood control

Flood control

In communications, flood control is a feature of many communication protocols designed to prevent overwhelming of a destination receiver. Such controls can be implemented either in software or in hardware, and will often request that the message be resent after the receiver has finished...

. The Karun has the highest discharge of Iran's rivers.

The purpose of the dam is for power generation and flood control. The Karun III power generators are connected to the national power network as the peak power generation.