Darcy's law is an equation that states that flow through porous media is directly proportional to hydraulic head and inversely proportional to the length of flow. Henri Darcy was a French engineer who worked at the Dijon water works in the mid 19th century. His “law” is the basis for much of the science of ground water hydrology and one of the most important basic equations used in hydrogeologic calculations.

Compute the effective conductivity, transmissivity of the aquifer below and the rate of flow between the two rivers.

Conceptual Hint:

For saturated flows, it is well known that the equivalent parallel hydraulic conductivity is equal to the arithmetic mean of all individual hydraulic conductivities of the layers parallel to flows, and the equivalent perpendicular hydraulic conductivity is equal to the harmonic mean of all individual hydraulic conductivities of the layers perpendicular to flows.

MAGNET/Modeling Hints:

• Use ‘Synthetic mode’ in MAGNET to create a model domain.
• Add prescribed head line or zone features along the left and right edges to represent the lake and stream.
• Use a zone feature of the entire aquifer area to assign the hydraulic conductivity as a random field realization. 
• Analyze the plots and charts using the DisplayCharts tool ( 'Analysis Tools' > 'Analysis' > 'Display Charts' )