The Audhumla town council has asked that you determine whether the discharge of the town’s wastewater into the Einherjar River will reduce the DO below the state standard of 5.00 mg · L−1 at Gotterdämmerung, 5.79 km downstream, or at any other point downstream. The pertinent data are as follows:
Parameter | Wastewater | Einherjar River |
Flow (in m3 · s−1) | 0.280 | 0.877 |
Ult-BOD at 15°C (mg · L−1) | 6.44 | 7.00 |
DO (in mg · L−1) | 1.00 | 6.00 |
kd at 28°C (in day−1) | N/A | 0.199 |
kr at 28°C (in day−1) | N/A | 0.370 |
Speed (in m · s−1) | N/A | 0.650 |
Temperature (in °C) | 28 | 28 |
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