Define the following terms i. Hydraulic gradientii. Seepageiii. Critical hydraulic gradient iv. Pipingv. Anisotropy vi. Hydraulic conductivity vii. Liquefaction viii. Flow net ix. Pore pressure Solution 1. Hydraulic Gradient: It is the head loss per unit seepage length. 2. Seepage: movement of fluid particles through porous media 3. Critical Hydraulic Gradient: It is the Hydraulic Gradient at critical condition, i.e., when seepage force just balances the buoyant force of an element of soil. 4. Piping: It is the gradual erosion of soil particles. 5. Anisotropy: exhibition of different property in different directions. 6. Hydraulic Conductivity: It is the ease with which a fluid (water) can move through pore spaces. 7. Liquefaction: It is a phenomenon in which soil loses it\'s strength and stiffness in response to an applied stress. 8. Flow Net: It is the network of equipotential lines and flow lines. 9. Pore Pressure: It is the pressure of water filling the void space between solid particles..