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Unformatted text preview: CE 563, Seepage & Slope Stability Handout #07 EM 111021901
30 Sep 86
For foundations, furthermost upstream and downstream flow lines and equipotential lines should
intersect at or near the center of the pervious
foundation. The flow line and equipotantial line nearest an
angle shouId intersect on the bisector of the
angle. Same as (b) except for an upstream toe on an
impervious foundation. 2:1 length ratios to establish shape of the
“square” in a pervious foundation at the toe of
an impervious fill. 2:1 length ratios used with angle bisectors to
shape flow around an imbedded 90degree angle. 2:1 length ratios to establish flow directions
beneath a thin cutoff wall taken to the midpoint
of the pervious stratum. Subdivide to check oddshaped "squares”. Resulting smaller oddshaped "squares” should
have the general shape of the one subdivided. Guides for flow net construction (from U. S. Department
123
of Agriculture
)
Figure 48. 413
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 Spring '11
 Seepage

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