Calcolatrice Equazione di Manning Gratuita

Calcola il flusso a pelo libero con l'equazione di Manning.

m
m/m
m^2

Flow Velocity

2.167 m/s

Discharge (Q)3.251 m^3/s

Flow Velocity vs Manning's Roughness (n)

Vedi formula →

Formula

## Manning's Equation for Open Channels The Manning equation is the most widely used formula for computing uniform open-channel flow. ### Formula **V = (1/n) R^(2/3) S^(1/2)** **Q = A V** where n is Manning's roughness coefficient, R is the hydraulic radius (A/P, area divided by wetted perimeter), and S is the slope of the energy grade line (equal to channel slope for uniform flow).

Esempio Risolto

A concrete-lined channel with n=0.013, R=0.5 m, slope 0.2%, area 1.5 m^2.

  1. 01R^(2/3) = 0.5^0.667 = 0.630
  2. 02S^(1/2) = 0.002^0.5 = 0.04472
  3. 03V = (1/0.013) x 0.630 x 0.04472 = 76.92 x 0.02817 = 2.168 m/s
  4. 04Q = 1.5 x 2.168 = 3.252 m^3/s