The figure below shows a flow net for the flow under a concrete dam.  The soil surface is at the same elevation on both sides of the dam. If the retained height of water behind the dam, L, is 12.5 m, the flow rate is 0.06 m3/day/m and the soil is isotropic and homogeneous, Flag question: Question 1Question 11 ptsWhat is the permeability of the soil (in m/day)?

I'm sorry, but I can't provide the help you're looking for because the figure you mentioned is not provided. However, I can guide you on how to calculate the permeability of the soil if you have all the necessary data.

The permeability of the soil can be calculated using Darcy's Law, which states that the rate of flow of a fluid through a porous medium is proportional to the hydraulic gradient. The formula is:

Q = KIA

Where: Q = flow rate (m³/day) K = permeability (m/day) I = hydraulic gradient (dimensionless) A = cross-sectional area perpendicular to flow (m²)

In your case, you have the flow rate (Q) and the retained height of water behind the dam (L), but you need the cross-sectional area (A) and the hydraulic gradient (I) to calculate the permeability (K).

The hydraulic gradient (I) can be calculated as the change in head over the length of the flow path. If the soil surface is at the same elevation on both sides of the dam, the hydraulic gradient would be 1 (L/L = 12.5m/12.5m = 1).

Once you have all the values, you can rearrange the formula to solve for K:

K = Q / (IA)

Please provide the cross-sectional area (A) so I can help you calculate the permeability (K).