Gravity Pipe Flow - Manning's Equation
Gravity pipe flow of a partially filled pipe.
Hydraulic radius is calculated and all hydraulic properties of the pipe are calculated in a table.
Three charts are provided to highlight maximum and special conditions for hydsraulic radius (R), flow rate (Q) and velocity (V).
Manning's n, hydraulic radius, slope and velocity can also be calculated for existing conditions.
GRAVITY PIPE FLOW - PARTIALLY FILLED PIPE
BY MANNING'S EQUATION
Gravity Flow in Pipes - The Manning Formula, William C. Dunn PE
Manning Equations, Robert Pitt & Shirley Clark
Worked through book examples & hand calculations.
Some variables in manning's equations have interesting properties
shown in the table & Charts on the Calcs sheet, providing a method
of self validation. Place cursor on dots on the charts to get values.
Determine the hydraulic radius based on water depth in pipe.
Input is US or SI; use the units of your choice, the rest are
Output is in US & SI units.
A Table based on percent of water depth points out some
interesting properties of hydraulic radius, flow rate and
Charts show visually the properties of hydraulic radius,
flow rate, and velocity plotted against percent of water
depth in the pipe.
Find Depth of Flow -- Q, n, S, r Known. Enter n, S and r. Take a guess at d.
Keep incrementing or decrementing d until Q = known value. You have found
Provides a Table of Manning's cofficient n.
Explains visually how slopes are determined.
Helps to solve for n, R, S, V for existing conditions.
Provides calculations to determine pipe diameter with
known design requirements of Q, Vallowable, Smin, and n.
Gravity Pipe Flow
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