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Consider the following situation in a flow mass curve study when the demand line drawn from a ridge in the mass curve does not intersect the mass curve again. This means that:

Consider the following situation in a flow mass curve study when the demand line drawn from a ridge in the mass curve does not intersect the mass curve again. This means that: Correct Answer The demand cannot be met by the inflow as the reservoir will not refill

Concept:

Mass Diagram: It is the plot of accumulated inflow(i.e. supply) or outflow(i.e demand) versus time.  

The mass curve of supply is, therefore, first drawn and is superimposed by the demand curve. The procedure is to construct such a diagram is as follows.

1. From the past records determine the hourly demand for all 24 hours for typical days (maximum, average, and minimum).

2. Calculate and plot the cumulative demand against time, and thus plot the mass curve of demand.

3. Repeat the procedure for all the typical days (maximum, average, and minimum), and determine the maximum storage required for the whole day.

It may be noted in a flow mass curve, a demand line when extended must intersect the mass curve. If it does not this represents the demand can not be met by the inflow and the reservoir will not refill.

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