Open Channel Flow Calculator
Calculate flow rates, velocities, and hydraulic parameters for open channels using Manning’s equation. Perfect for civil engineering, hydrology, and drainage design projects.
Step 1: Channel Geometry
Channel Geometry Notes
For rectangular channels: z = 0. For trapezoidal: z = horizontal/vertical ratio. For triangular: B = 0, z > 0.
Step 2: Hydraulic Parameters
Manning’s Equation
Q = (A * R^(2/3) * S^(1/2)) / n
Where: Q = Flow rate, A = Cross-sectional area, R = Hydraulic radius, S = Slope, n = Manning’s roughness coefficient.
Open Channel Flow Calculation Results
Flow Rate (Discharge)
Hydraulic Parameters
Flow Classification
Subcritical flow: Fr < 1 (slow, tranquil flow). Critical flow: Fr = 1. Supercritical flow: Fr > 1 (fast, rapid flow). Your calculated Froude number indicates subcritical flow conditions.
Flow-Depth Relationship
Manning’s Equation Formula
Q = (1/n) × A × R^(2/3) × S^(1/2)
Where:
Q = Flow rate (discharge)
n = Manning’s roughness coefficient
A = Cross-sectional area of flow
R = Hydraulic radius (A/P)
S = Energy slope (channel slope for uniform flow)
P = Wetted perimeter
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