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TheStreeter-Phelps model can be used to compute the dissolved oxygen concentration in a river below a point discharge of sewage (Fig. P16.17),
where
As indicated in Fig. P16.17, Eq. (P16.17) produces an oxygen “sag” that reaches a critical minimum level
FIGURE P16.17
A dissolved oxygen “sag” below a point discharge of sewageinto a river.
below the point discharge. This point is called “critical” because it represents the locationwhere biota that depend on oxygen (like fish) would be the most stressed. Determine the critical travel time and concentration, given the following values:
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Numerical Methods for Engineers
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