<p>Here is a Hydraulics problem that I need help solving:</p> <p>Two tanks are c

Question

<p>Here is a Hydraulics problem that I need help solving:</p>
<p>Two tanks are connected by a 500-ft length of 1-in.-I.D. PVC pipe. The appropriate value for the Hazen-Williams coefficient C is 150. Water at 60 degrees Farenheit is flowing through the pipe at a velocity of 10 ft/sec. The tanks are open to the atmosphere. Entrance, exit, and minor losses are negligible.</p>
<p>The difference in water surface elevation (ft) between the two tanks is most nearly?</p>
<p>Here are the possible answers:</p>
<p>&#160;</p>
<p>(A) 81</p>
<p>(B) 167</p>
<p>(C) 182</p>
<p>(D) 447</p>
<p>Please help me.&#160; I specifically need help in finding out what would be the radius (R) value in the Hazen-Williams equation would be.</p>
<p>Thanks!</p>
<p>&#160;</p>
<p>&#160;</p>

Explanation / Answer

R in this case is the hydraulic radius...which is simply the area of flow divided by the wetted perimeter. In the case of a pipe flowing full, this is pi * r ^2 / 2 * pi * r, which reduces to r / 2. In the case of the above problem, this would be 1/2 in. C is 150, given. Hazen-Williams formula is: V = k * C * R^0.63 * S^0.54. Using this and the v given, you can find the slope in the pipe. But, if both tanks are open to atmosphere and static, water surface is static.

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