A dual-medium filter is composed of 0.3 m anthracites (mean size of 2.0 mm) that are placed over a 0.6 m layer of sand (mean size of 0.7 mm) with a filtration rate of 9.78 m/h. Assume the grain...

A dual-medium filter is composed of 0.3 m anthracites (mean size of 2.0 mm) that are placed over a 0.6 m layer of sand (mean size of 0.7 mm) with a filtration rate of 9.78 m/h. Assume the grain sphericity is ϕs= 0.75 and porosity for both is 0.40. Estimate the head loss of the filter at 15^oC.