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The Design Of Potable Water Supply System For Institutional Setting
[A CASE STUDY OF KWARA STATE POLYTECHNIC PERMANENT SITE] -
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2.2.3 Dual System:
This is also known as combined gravity and pumping system. In the beginning when demand is small the water is stored in the elevated reservoir, but when demand increases the rate of pumping, the flow in the distribution system comes both from the pumping station as well as elevated reservoir.
As in this system water comes from two sources one from reservoir and second from pumping station, it is called dual system.
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