Explanation:

All statements are correct.

About Central Water Commission (CWC)

• It is a premier technical organization of India in the field of water resources.

• It is presently functioning as an attached office of the Ministry of Jal Shakti, Department of Water Resources, River Development, and Ganga Rejuvenation, Government of India.

• Headquarters: New Delhi

Functions:

• The Commission is entrusted with the general responsibilities of initiating, coordinating,and furthering, in consultation with the State Governments concerned, schemes for control, conservation, and utilization of water resourcesthroughout the country for purposes of Flood Control, Irrigation, Navigation, Drinking Water Supply, and Water Power Development.

• It also undertakes the investigations, construction, and execution of any such schemes as required.

• It is headed by a Chairman, with the status of Ex-Officio Secretary tothe Government of India. 

Hence option 3rd is correct.