Kotri Barrage was completed in 1955, confirming option A is correct.
Kotri Barrage was inaugurated by President Ghulam Muhammad, so option B is correct.
Kotri Barrage has a discharge capacity of 875,000 cubic feet per second, making option C correct.
Kotri Barrage consists of 44 gates to regulate water flow, confirming option C.
Each gate of Kotri Barrage is 18 meters wide, confirming option C is correct.
Khanki Headworks is the oldest headworks in Pakistan, constructed in the 19th century, so option B is correct.
Khanki Headworks is situated on the Chenab River, making option D correct.
Khanki Headworks is located in Wazirabad, Gujrat district of Punjab, so option B is correct.
Construction of Khanki Headworks started in 1882, making option A correct.
Khanki Headworks was completed in 1889, confirming option D.
Chashma Barrage was built on the Indus River in Mianwali district in 1971, making option C correct.
The primary purpose of Chashma Barrage is to provide irrigation to agricultural land, so option C is correct.