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<br /> 0< 300 <br /> "- <br /> tJ> , <br /> " <br /> Ul <br /> '0 200 <br /> ..-i <br />, ..... <br /> 0 <br /> Ul <br /> '0 <br /> OJ 100 <br /> '0 <br /> ~ <br /> OJ <br /> 0. <br /> Ul <br /> ::J <br /> Ul <br /> 0 <br /> 0 100 200 300 <br /> Flow Tunnel (liter/sec) <br /> <br /> <br />Figure 2. Concentration of SS vs. Flow in the Storm-Water <br />Sewer (Soderlund and I,ehtinen, 1972) <br /> <br />other parameters, especially the heavy metals did not display <br /> <br />this extremely high correlation. The significance of this result <br /> <br />is that no "washing-out" effect occurred. This is important if <br /> <br />stormwater runoff has to be collected and treated. At Sacramento, <br /> <br />California (EPA, 1971a) the same relationship has been shown to <br /> <br />exist between river flow and the suspended solids concentration. <br /> <br />However, an inverse relation was found to exist between fecal <br /> <br />coliforms and flow. The concentrations of BOD and Total-N seemed <br /> <br />to decrease with increasing flow, according to the British study <br /> <br />at Northampton (Davidson and Gameson, 1967). <br /> <br />The effect of antecedent dry period has been investigated <br /> <br />by Sartor and Boyd (1972) and their results are presented in <br /> <br />the curve shown in Figure 3. <br /> <br />28 <br />