Pipeline Flow Rate Calculator
This calculator estimates the flow rate of fluid in a pipeline based on pipe diameter, slope, surface roughness, and kinematic viscosity. It is ideal for civil, hydraulic, and mechanical engineers involved in water supply, sewage, or industrial fluid transport systems.
Pipeline Fluid Flow Rate Estimator
Pipeline Flow Rate Calculation Formula
Where:
- $$Q$$ — flow rate (m³/s)
- $$D$$ — internal pipe diameter (m)
- $$g$$ — gravitational acceleration (9.81 m/s²)
- $$S$$ — slope (m/m or unitless gradient)
- $$K_s$$ — roughness coefficient (m)
- $$v$$ — kinematic viscosity (m²/s)
This formula approximates flow in partially full or full gravity-driven pipes, combining hydraulic principles and empirical roughness adjustments.
This formula is useful for estimating the discharge capacity of pipelines, especially in open channel or gravity flow conditions. Adjustments for pipe roughness $$K_s$$ and fluid viscosity $$v$$ improve accuracy for various fluid types and materials. Typical applications include drainage design, stormwater systems, and municipal water engineering. The calculator simplifies complex hydraulic computations into one quick result.