Investigation of Salt Intrusion Condition in the Belat Estuary Jacqueline Isabella Gisen, Siti Syuhaida Adnan, Ahmad Amirul Ahmad Tajudin and Tian Xian Chan MATEC Web of Conferences, 150 (2018) 03005 Published online: 23 February 2018 DOI: 10.1051/matecconf/201815003005