Use this engineering calculation for a transparent preliminary estimate or independent arithmetic check when geometry, materials, loads, operating conditions, and units are defined consistently.

Standpipe Area Square Meters (m²)

Required number input.

Sample Length Meters (m)

Required number input.

Sample Area Square Meters (m²)

Required number input.

Elapsed Seconds (s)

Required number input.

Initial Head Meters (m)

Required number input.

Final Head Meters (m)

Required number input.

Saturated hydraulic conductivity from a falling-head permeameter: k=(aL/At)ln(h1/h2). The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Conductivity Meters Per Second (m/s)

The resulting conductivity meters per second returned as a number.

• Soil pressure, bearing, permeability, and consolidation results depend on stratigraphy, drainage, stress history, groundwater, sampling, laboratory method, anisotropy, construction sequence, and failure mechanism. Site investigation and code-specific factors are essential.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check assumptions against drawings, measurements, current material data, and the applicable design code. Apply required load combinations and safety factors, then obtain qualified review and testing for consequential designs.

• Soil Permeability Constant Head

  Saturated hydraulic conductivity from a constant-head permeameter: k=QL/(Aht), where Q is collected volume.

• Dewatering Well Flow

  Steady radial flow to a well in a confined aquifer by the Thiem equation; uses hydraulic conductivity, saturated thickness and two observation radii.

• Bernoulli Total Head

  Total ideal-flow head as elevation plus pressure head and velocity head; excludes friction and pump terms.