Filter design
FILTER DESIGN

Filter design

FILTER DESIGN Filter drains should be design in such a way that all the seeping water through the dam is effectively drained off. The filter consists of more than one layer. The filter layer which comes in contact with the seeping water first is of fine material. Subsequent layers of filter are made of sand of increased coarseness. The last layer from which water comes out of the filter is made of gravel. The filters of filter drains are also know reverse or invert filter. The soil of earth dam and foundation surrounding the filter is know the base material. According to earth manual of US Bureau of Reclamation Washington 1960 following four main requirements should be satisfied. Filter material should be fine and poorly grad so that the voids in the filter are small and thus prevent base material from entering the filter. The filter material should be coarse…

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