estimating of maximum allowable pollutant in gorganrood river

gorganrood river is one of the three main rivers in golestan province have a basic role in golestan water supply. to study gorganrood water quality and estimating maximum allowable pollutant, water quality data was used from 8 stations. purification of this river has been studied by two methods: statistical and experimental methods. each method showed that the gorganrood river at present condition has no problem for purification. average measured bod in this river on tamar-ghareghoozy station was 9.7 mg/lit and maximum observed bod on up stream of voshmgir dam was, some times larger than allowable amount but on the down stream there wasnt any problem. average bod in gorganrood varies from 1.7 mg/lit on gonbad entrance station to 2.48 mg/lit on tamar-ghareghoozy and agh ghala entrance stations. this river has no main problem to fall pollutants.