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

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.

Fluid Mechanics

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.

Key differences

	Manning's Equation Open Channel Calculator	Pipe Network Flow Distribution Calculator
Category	Fluid Mechanics	Fluid Mechanics
Inputs required	4	6
Result	Flow Rate (m³/s)	Flow in Pipe 1 (m³/s)
What it does	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.	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.