Transcription of 6. SEEPAGE THROUGH DAMS
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6. SEEPAGE THROUGH DAMS
6-1. 6. SEEPAGE THROUGH DAMS. TYPES OF DAMS. The type of earth or earth and rockfill dam that is constructed at a particular location is usually dictated by the local availability of appropriate materials such as quarried rock, gravel, sand, silt or clay. A homogeneous dam (Fig. ) is one that is composed almost entirely of the one material which is usually relatively impervious. With this type of dam it is necessary to incorporate some type of downstream pervious drain with appropriately placed filters in order to control the SEEPAGE water. This is to prevent the occurrence of a piping failure by the internal erosion of the finer particles of the earthfill. If there exists a plentiful supply of rockfill, a thin core dam (Fig. ) could be constructed.
parabola (with focus at point 0) no longer gives an accurate representation of the line of seepage in the vicinity of the discharge face. By means of a number of graphical solutions Casagrande has prepared a series of corrections to the basic parabola in terms of the slope of the discharge face as represented by the angle α.
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