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<br />. <br /> <br />Table 20 <br /> <br />Estimated Annual Load of Pollutants <br />Entering the Area Receiving Streams <br />Tulsa, Oklahoma <br />(EPA, 1974) <br /> <br /> Average annual Contribution of 1968 Average <br /> storm sewer storm sewer annual load <br /> discharge discharges from treatment <br /> pollution load, to total load, plant effluentsa <br />Pollutant 1b % 1b <br />BODs 1,620,000 20 7,060,000 <br />COD 11,200,000 31 24,400,000 <br />5S 39,000,000 85 6,710,000 <br />Organic <br />(Kje1dah\l) <br />nitrogen 130,000 31 278,000 <br />Soluble <br />orthophosPhate 171,000 . 4 4,180,000 <br /> <br />a. One p~imary (21 mgd) and three secondary (19 mgd, total) plants. <br /> <br />Note: 1b x 0.454 = kg <br />mgd K 0.0438 = cu m/sec. <br /> <br />42 <br />