Practice

For a total phosphorus TMDL on a river in a farmed watershed, the loading capacity is the load the stream carries at its critical low flow of 220 cfs when it just meets the water quality standard of 0.10 mg/L. Load allocations to nonpoint sources and natural background total 70 lb/day, and a margin of safety equal to 10% of the loading capacity is set aside. The total waste-load allocation available to point sources (lb/day) is most nearly:

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