ENGINEERING – GEOTECHNICAL ENGINEERING CALCULATOR
Groundwater Flow
A precise tool.
What is the Groundwater Flow & How does it work?
Groundwater movement through porous media is governed by Darcy’s law, which relates the volumetric discharge to the hydraulic properties of the aquifer and the driving hydraulic gradient. The law is foundational for estimating flow rates in wells, drainage systems, and contaminant transport studies. Mathematically, Darcy’s law is expressed as The hydraulic gradient i is often computed from the head difference (Ξh) over the flow length (L), i = Ξh / L. In practice, engineers measure or estimate K from laboratory tests, determine Ξh from piezometric data, and define A based on the geometry of the flow path. Substituting these values into Darcy’s equation yields the groundwater discharge, a critical parameter for design and environmental assessment.
Q = K cdot i cdot A
Q = discharge (mΒ³/s)
K = hydraulic conductivity (m/s)
i = hydraulic gradient (dimensionless)
A = crossβsectional area perpendicular to flow (mΒ²)
K = hydraulic conductivity (m/s)
i = hydraulic gradient (dimensionless)
A = crossβsectional area perpendicular to flow (mΒ²)
Parameters
Result
β
Frequently Asked Questions
What is Darcy’s law in groundwater?
Darcy’s law states that the discharge of groundwater through a porous medium is directly proportional to the hydraulic gradient and the hydraulic conductivity of the medium.
How do I calculate hydraulic gradient?
Hydraulic gradient is calculated as the change in hydraulic head divided by the distance over which the change occurs.
What units are used for hydraulic conductivity?
Hydraulic conductivity is typically measured in meters per second (m/s).
How does cross-sectional area affect groundwater flow?
The cross-sectional area perpendicular to the direction of flow affects the discharge; a larger area allows for more flow.
Can Darcy’s law be used for non-porous media?
Darcy’s law is specifically applicable to porous media. For non-porous media, other models like the Brinkman equation are used.
What factors can influence hydraulic conductivity?
Hydraulic conductivity can be influenced by factors such as grain size, porosity, and fluid viscosity of the aquifer.
How is groundwater flow rate calculated using this calculator?
Groundwater flow rate is calculated by multiplying hydraulic conductivity, hydraulic gradient, and cross-sectional area according to Darcy’s law.
Results are for informational purposes only and do not constitute professional advice.