Question

Hooghoudt's equation is used to design lateral drain spacing for two layered profiles, if

• A. Drains are located in the upper layer only
• B. Drains are located at the interface of the two layers only
• C. Drains are located in the lower layer only
• D. Drains are located either in the upper or lower layers only

Hint:

Placing the drains at the boundary interface of a two-layered soil profile allows the mathematical separation of hydraulic conductivity into $K_1$ (for horizontal flow above the drains) and $K_2$ (for radial flow below the drains) in Hooghoudt's equation.

Answer 1

The Correct Option is B