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Both calculators run independently — change the inputs on either side to compare results.

Pipe Network Flow Distribution Calculator

Distribute flow between two parallel pipes based on their diameters, lengths, and roughness using Hardy-Cross principles. Useful for engineers balancing water distribution networks and designing parallel pipe systems.

Total Inflow (m³/s)

Pipe 1 Diameter (m)

Pipe 2 Diameter (m)

Pipe 1 Length (m)

Pipe 2 Length (m)

Pipe Roughness

Fill in the required fields to see your result.

Fluid Mechanics

Manning's Equation Open Channel Calculator

Compute flow velocity and discharge in open channels — rivers, canals, and drains — using Manning's equation. Essential for flood modelling, irrigation design, and stormwater drainage sizing.

Hydraulic Radius (m)

Channel Slope (m/m)

Manning's Roughness (n)

Cross-sectional Area (m²)

Fill in the required fields to see your result.

Key differences

	Pipe Network Flow Distribution Calculator	Manning's Equation Open Channel Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	6	4
Result	Flow in Pipe 1 (m³/s)	Flow Rate (m³/s)
What it does	Distribute flow between two parallel pipes based on their diameters, lengths, and roughness using Hardy-Cross principles. Useful for engineers balancing water distribution networks and designing parallel pipe systems.	Compute flow velocity and discharge in open channels — rivers, canals, and drains — using Manning's equation. Essential for flood modelling, irrigation design, and stormwater drainage sizing.