Water at 20°C is passed through a filter bed at 4.32 m/hr. The bed is 0.75 m deep and is composed of nonuniform sand (sp. gravity= 2.65) stratified so that the smallest particles are on top, the...

Extracted text: Water at 20°C is passed through a filter bed at 4.32 m/hr. The bed is 0.75 m deep and is composed of nonuniform sand (sp. gravity= 2.65) stratified so that the smallest particles are on top, the largest on bottom. The porosity and shape factors are 0.4 and 0.85 throughout the depth of bed. The size distribution of the granules given in the table below. Determine the headloss for clean water flow through bed. at 20°C; µ = 1.002x 10-3 kg/m.sec, p= 998.2 kg/m³ Sieve Analysis Results: U.S Sieve No. Particle Size range, Weight mm fraction retained, x# Passing Retained Passing Retained 14 1.41 0.01 14 20 1.41 0.84 0.11 20 25 0.84 0.71 0.20 25 30 0.71 0.60 0.32 30 35 0.60 0.50 0.21 35 40 0.50 0.42 0.13 40 0.42 0.02 82