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

Flow Cubic Meters Per Day (m³/day)

Required number input.

Plan Area Square Meters (m²)

Required number input.

Surface overflow rate of a clarifier from volumetric flow divided by plan surface area; not a settling performance prediction. 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]

Overflow Meters Per Day (m/day)

The resulting overflow meters per day returned as a number.

• Hydraulic equations require consistent datum, fluid properties, geometry, roughness, flow regime, and loss coefficients. Cavitation, air entrainment, unsteady flow, fittings, sediment, free-surface effects, and pump behavior may require a network or numerical model.
• 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.

• Flow Rate Velocity Area

  Volumetric flow rate from mean cross-sectional velocity and flow area.

• Manning Flow Rate

  Open-channel discharge from Manning n, flow area, hydraulic radius and energy slope in SI units.

• Venturi Flow Rate

  Incompressible Venturi flow from inlet and throat area, pressure difference and discharge coefficient; requires throat smaller than inlet.