THE MINIMUM ENVIRONMENTAL FLOW OF POLLUTED RIVERS IN AREAS LACKING ECOLOGICAL DATA–A CASE STUDY OF A HEAVILY POLLUTED RIVER IN THE UPPER HAI RIVER, CHINA. - MENG, C. F.; SONG, X. Y.; LIU, X. Y.; ZHAO, W. J.; WANG, Y.; YE, B. X.; GUO, S. X. (Applied Ecology & Environmental Research, 2022)