Question

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> Question 1 In urban water distribution systems the water supply is highly variable, whereas the water demand is generally constant. True False D Question 2 Hardy Cross Method ensures application of continuity equation by SK(Q+AQ)" -0 True O False

Answer 1

Answers

1) - False - in urban systems usually demand varies depending on the type of land use, residential units might required lesser than factories. Supply is usually more or less constant

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2) True - two methods used to analyze distributed water pipe networks are Hardy Cross method and equivalent pipe method

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3) True - Hardy cross method assumes the following

A = Q-Q Q = 2,+A

H =k(Q,+A)"

4) False - in virtual water trade, we dont pump large quantities of water from one country to another.

The virtual water trade is the idea that when goods and services are exchanged, so is virtual water. When a country imports one tonne of wheat instead of producing it domestically, it is saving about 1,300 cubic meters of real indigenous water. If this country is water-scarce, the water that is 'saved' can be used towards other ends.

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5) Not sure

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6) Answer is h_L = A*q^B

EPANET software uses either Hazey Williams or Darcey Weisbach or Chezy Manning formulas.

Each formula uses the following equation to compute headloss between the start and end node of the pipe:

where h_L= headloss (Length), q = flow rate (Volume/Time), A = resistance coefficient, and B = flow exponent.

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7) True - Brackish water is water having more salinity than freshwater, but not as much as seawater.

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