20 cm An inclined permeameter tube is filled with three layer of soil of different permeabilities. Express the head at points A, B, C, and D (with respect to the datum indicated in terms of the different dimensions and permeabilities. (1) Work the problem first assuming k₁ = k₂ = k3. (2) Then work it assuming 3k₁ = k₂ = 2k3. Plot the various heads versus horizontal distance for both parts (1) and part (2). D B C K₁ K1 16 cm 8 cm 4 cm Datum 10 cm 5 cm