Cumulative Flow Curve

Equalization basins for individual facilities can be sized based on a cumulative flow or mass diagram. This well-

known method has long been used to determine the storage required for water reservoirs. The graphic technique consists of plotting cumulative flow versus time for one complete cycle (24 hr for municipal facilities). Two parallel lines, with slopes representing the rate of pumping or flow of the equalization tank, are drawn tangent to the high and low points of the cumulative flow curve. The required tank size is the vertical distance between the two tangent lines. The method is shown in Table 7.13.4 and Figure 7.13.7.

The preceding procedure provides the tank size for the flow-time trace of one day. The variability and thus the


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