C E 345 HW-4, F7.18 Apparently, there is something wrong with this flow net in t

Question

C E 345 HW-4, F7.18

Apparently, there is something wrong with this flow net in the figure. My professor said it will be a bonus on the midterm. Please help.

Besides quantity of flow, other products of flow nets are ud n net i with confined flow problems, where there is no phreatic (free) surface, sketching a flow so difficult. Start with a sketch, to scale, of the soil mass, boundaries, and so on. Keep the ske u can observe the entire picture as it develops. Use good-quality paper, a soft pencil, eraser handy-you'll need it! Draw the boundaries in ink on the reverse side of the sheet. Start Bood and have out the re number. The flow lines and eq an most, only three or four lines. By trial and error, sketch the net (lightly) until you get "squares>"twih, at e region of flow. It's easier if you can manage to keep the number of flow channels to ber. The flow lines and equipotential lines should be smooth, gradual curves, all intersectin at right small squares. gles. As mentioned, you should be able to subdivide each square to make additional sm w net shown in Fig. 7.18 is an example of a fairly well-drawn flow net for confined flow ni 40 m Number of equipotentil drops 10 m sheet pile 12 m 2 m 10 m sheet pile 8.5 m 5.4) 6.4 9 10.4 3.5 2 7.4 30 m 9.4 8.4 C' 0.4 Impervious Scale: 0 10 m FIGURE 7.18 Example of a reasonably well drawn flow net for confined flow.

Explanation / Answer

Hi,

Hope it helps.

Thanks.

There is only one thing which is possibly incorrect which is with the intersection between the flow lines and the equipotential lines.

There is a property which states that both the above lines must intersect each other at right angles.This doesnt seem correct for flow line no. 3.

Also, the depth of sheet piles is kept same in the diagram. This must be different as the water level at both upstream as well as downstream shows a large difference.

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