Strategy of Water Pollution Control Base On Social Economic Activitiy, in Karang Mumus River, Samarinda East Kalimantan, IndonesiaVita Pramaningsih, Slamet Suprayogi and Setyawan PurnamaE3S Web Conf., 31 (2018) 04007DOI: https://doi.org/10.1051/e3sconf/20183104007