'fhe Pearl Rive r , entering the study reach at site 1 at Jackson, was generally highe r in dissolved-oxygen concentrations and lower in dis solved-solids, nutrients, and biochemical oxygen demaruis than at site 13 at Byram 11.8 miles downstream of site 1 and about 11 river miles downstream of treated sewage inflow. The dissolved-oxygen concentrations of the water ranged from 6.4 to 7.8 milligrams per liter at site 1 and fran 4.C} to 7.4 milligrams per liter at site 13. The average dissolved-s ol ids concentrations were 60 and 97 milligrams per liter at sites 1 and 1 '3, respectively. The average dissolved-solids load increa sed downstre am ahout '35 tons per day. The average loads of 5-day biochenica l oxygen demand, total phosphorus, and ammonia increased downstream about 2, 0.7, and 0.6 tons per day, respectively. The water in the study r each contained color, total iron, and rranganese concentra tions tlvlt exceeded limits recamEnded for public \vate r supplies. Trace arrounts of some pesticides and minor el~nts were [Jresent in hath the water and hottm rraterial at sites 1 and 13. Although the concentra tions of a few dissolved constituents exceeded recamEnded lir.ri.ts during the study, the Pearl River in the study reach may be considered heneficial for many purposes.
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