Marshall E. Jennings Jeffrey E. Miller Daniel P. Bauer 1979 <p><span>A computer program, based on a one-dimensional mathematical model </span><span>which predicts the stream water-quality response characteristics from </span><span>waste source inputs, is described and documented. Variables predicted </span><span>include dissolved oxygen, biochemical oxygen demand, nitrogen forms, </span><span>total and fecal-coliform bacteria, orthophosphate-phosphorus, and various </span><span>conservative substances. The model is based primarily on the well known </span><span>Streeter-Phelps oxygen-sag equation. Special options of the program </span><span>include the capability of handling nonpoint source waste inputs and </span><span>anoxic conditions. </span></p><p><span>The model formulation is based on a steady-state assumption which requires constant flow rate of waste and stream discharges and associated parameters. To achieve a problem solution, each reach of a stream system is broken into a given number of subreaches, generally defined by locations of waste or tributary inflow points. All waste constituents are assumed to be completely mixed within any cross section.</span></p> application/pdf 10.3133/wri7945 en U.S. Geological Survey One-dimensional steady-state stream water-quality model reports