ABSTRACT:A steady‐state, one‐dimensional water quality model has been formulated to evaluate spatial variations of Biochemical Oxygen Demand, ammonia nitrogen, and dissolved oxygen for nontidal, branched river systems, with point sources of treated wastes and uniform nonpoint‐source loads, under aerobic and/or anaerobic stream conditions. For anaerobic conditions, the decay rate of organic matter is assumed to be limited by the rate of oxygen addition to the streams via stream reaeration and net algal photosynthesis and respiration contributions. The model is applicable to stream impact analysis under sustained wet weather conditions, during which storm‐runoff loads are generated by storms of sufficiently long duration to approach steady state in the river
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