Example $8.3 :$ Calculate the dimensions of rapid sand filter for 1 lakh population with 150 lit/capita/day. Assume the filtration rate and mean size of sand 1.5 $\mathrm{mm}$ . Find the depth of sand bed for head loss of 2 $\mathrm{m}$ if break through index $\mathrm{B}=0.002 .$ Assume rate of …