Abbas Roshani nia - Hydraulic expert, Dezab Consulting Engineers
Faramarz Zalaghi - Hydraulic expert, Dezab Consulting Engineers
Mohammad Sallakhpur - Hydraulic expert, Dezab Consulting Engineers

Mizan dam, Shadorwan bridge-dam and Dariun creek which were constructed on Karoon river in Shushtar city are from old and ancient structures that are located in Khuzestan province. In this paper their technical and engineering specifications have been addressed. Mizan dam was constructed in Sassanid Shahpur I reign in order to regulate and to divide Karoon river water between 2 tributaries; Gargar and Shotate. this dam has 9 entrances whose buttoms are a little lower than lowest water level of the river. Dariun Creek was dug out down stream of Mizan dam in the Achaemenid Darius I reign In order to irrigate Mianab plain. Shadorwan bridge-dam was built down stream of Dariun creek by sassanid Shahpur I for 2 purposes: 1- To connect either side of karoon river. 2- To raise water level for providing necessary head so that water rivers the Dariun creek.