Soil texture, specifically the size and distribution of soil particles, plays a dominant role in determining soil permeability.

Gravel, due to its large pore spaces and interconnected voids, typically possesses the highest permeability among these soil types.

Soil density and permeability are inversely proportional. As soil density increases, the pore spaces and interconnected voids decrease, resulting in reduced permeability.

Soil temperature generally does not have a significant impact on soil permeability compared to other factors like soil texture, structure, and organic matter content.

The falling head permeability test is commonly used in the field to determine the permeability of soil.

The coefficient of permeability (k) in Darcy's Law represents the hydraulic conductivity of the soil.

Darcy's Law states that the discharge velocity (v) through a soil is directly proportional to the hydraulic gradient (i) and the coefficient of permeability (k).

Soil permeability plays a crucial role in various applications, including groundwater recharge, dam construction, and roadway design.

High soil permeability can facilitate the rapid movement of water through the soil, potentially leading to increased erosion.

Low soil permeability can cause poor drainage, reduced crop yield, and increased soil salinity.

Adding sand to soil can enhance soil permeability by increasing pore spaces and interconnected voids.

To convert m/s to cm/s, multiply by 100. Therefore, 10^-5 m/s = 10^-5 * 100 = 10^-4 cm/s.

Using Darcy's Law, v = ki, the discharge velocity (v) can be calculated as 2.5 x 10^-4 m/s * 0.2 = 5.0 x 10^-5 m/s.

Using the formula k = (QL)/(AtΔh), where Q is the flow rate (V/t), the coefficient of permeability (k) can be calculated as (100 mL/60 s * 1 cm^3/1 mL) * (10 cm) / (25 cm^2 * 5 cm) = 2.0 x 10^-4 cm/s.

Using the formula k = (aL)/(At) * ln(h0/hf), where a is the cross-sectional area of the standpipe, the coefficient of permeability (k) can be calculated as (π * (1 cm)^2 * 15 cm) / (10 cm^2 * 300 s) * ln(20 cm / 10 cm) = 2.4 x 10^-5 cm/s.