Graded Filter

Filter, Graded

 

a device in headworks that consists of several layers of unconsolidated material with increasingly coarse particles in each layer. The material may be sand, gravel, rubble, or pebbles; the coarseness of the particles increases toward the seepage line. Graded filters are used mainly in earth dams and other hydraulic-engineering installations erected on soft foundations. Such filters prevent seepage from washing fine soil particles from the body and base of the installation.

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Tenders are invited for Entering into Annual Rate Contract for the purchase of Neonatal Screening Card (Special Graded Filter Paper) for the Department of Genetic Centre
Once dosed, effluent passes through 6 inches of rock and 2 feet of graded filter sand before being collected by three 1,200 gallon pump tanks connected to form one 3,600-gallon pump chamber.
Tenders are invited for Entering into ARC for the purchase of Neonatal Screening Card (Special Graded Filter Paper) for the Department of Genetic Centre
By merging and processing 16 exposures, 4 shot by Jonathan Kern using radial graded filters and 12 unfiltered images that she herself took, Wendy Carlos (www.