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<br />A study in Trondheim, Norway (Kalleberg and Malme, 1974) <br /> <br />evaluated stormwater runoff from an area with separate storm <br /> <br />sewers and compared it with an area with combined sewers. The <br /> <br />. former area is a part of a newly developed residential section <br /> <br />with an area of approximately 20 ha (49 acres) and rolling <br />topography. The results are given in the following table. <br /> <br />TABLE 3 <br />Stormwater Pollutant Concentrations <br />Trondheim, Norway <br />(Kalleberg and Malme, 1974) <br /> <br /> Min (mg/2) Max (mg/2) <br />COD 6 241 <br />BOD 5 20 <br />88 39 3080 <br />VSS 6 130 <br />Top P 0.01 0.5 <br />Lead 0.001 0.02 <br />Oil & Grease 15.9 <br /> <br />Recently, a second study was made in Durham, N.C. (Colston, <br /> <br />1974). The stormwater runoff system is composed of overland <br /> <br />flow, street gutters, small pipes and culverts and no storm sewer <br /> <br />system exists as such. The results of this study are shown in <br /> <br />the Table 4. <br /> <br />A very complete analysis of the pollutional characteristics <br /> <br />was made at seventeen sampling points in Dallas, Texas for a 48 rom <br /> <br />(1.9 inch) storm that occurred on February 11, 1977 (Dallas Water <br /> <br />Utility, 1977). The results, averaged for the seventeen sampling <br /> <br />points, are shown in Table 5. It was stated in the report that <br /> <br />9 <br /> <br />0, <br />