Average Velocity Calculator for Shallow Concentrated Flow

Average Velocity Calculator

Calculate the average velocity for shallow concentrated flow using Manning’s Equation:
$V = \frac{1}{n} R^{\frac{2}{3}} S^{\frac{1}{2}}$

* Enter Manning’s roughness coefficient $n$ , hydraulic radius $R$ (ft), and slope $S$ (ft/ft).

Step 1: Enter Parameters

Manning’s Roughness Coefficient,

n

Example: 0.015

Hydraulic Radius,

R

(ft):

Example: 2 ft

Slope,

S

(ft/ft):

Example: 0.01 ft/ft