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Note: Bold numbers are used in the interpolations and extrapolations discussed in the text.

Note: Bold numbers are used in the interpolations and extrapolations discussed in the text.

and infiltration flow will dominate. Infiltration values are therefore monitored at wet-weather conditions during early hours in the morning.

Figure 1.9 shows the result of a monitoring during wet-weather conditions in a sanitary sewer system. As shown, there are several minima and the question is which one should be chosen. The infiltration rate should be a constant value during a particular study period, and the cause of the fluctuation in the figure would be the effect of the sanitary flow. The fluctuation of the sanitary flow has to be above the infiltration rate. The sanitary flow is above the infiltration rate, so the infiltration rate point should be below all else in the figure. Using this criterion, a horizontal straight line is drawn in Figure 1.9 that is below all points in the curve. This horizontal line represents the reading for the infiltration rate which is found to be equal to 24.0 m /h.

Direct inflow is important in sizing wastewater engineering structures. This occurs immediately after rainfall and can be determined if the hydrograph of the flow had been recorded. The procedure for determining inflow is as follows: the hydrograph on the times immediately preceding the occurrence of rainfall is extended.

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