Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Mannings Equatiin
- Thread starter queque
- Start date
Sorry, I should have added some detail. The actual calculation depends on the context:
1) The velocity reported in the reach summary is simply the flow (CFS) divided by the cross-sectional area at the flow depth. All these parameters are known at each step in the routing, so the calculation is straight-forward. For complete details please click on the specific item in the reach summary.
2) Manning's equation is used to determine the initial stage-discharge relationship: For any depth, Manning's equation is used to calculate the flow velocity. Multiply by the cross-section to get the discharge at each depth, as shown on the stage-discharge plot for any reach. You can also display the velocity by selecting it from the right-click menu.
1) The velocity reported in the reach summary is simply the flow (CFS) divided by the cross-sectional area at the flow depth. All these parameters are known at each step in the routing, so the calculation is straight-forward. For complete details please click on the specific item in the reach summary.
2) Manning's equation is used to determine the initial stage-discharge relationship: For any depth, Manning's equation is used to calculate the flow velocity. Multiply by the cross-section to get the discharge at each depth, as shown on the stage-discharge plot for any reach. You can also display the velocity by selecting it from the right-click menu.
- Thread starter
- #5
queque,
For a custom reach cross-section, the geometry is defined by a number of straight line segments. The area is calculated by stacking trapezoidal shapes inside this outline, up to the desired depth. The sum of all the trapezoid areas is the total cross section. Basically, its the same procedure you would use to calculate the cross-section from a hand-drawn sketch.
For a custom reach cross-section, the geometry is defined by a number of straight line segments. The area is calculated by stacking trapezoidal shapes inside this outline, up to the desired depth. The sum of all the trapezoid areas is the total cross section. Basically, its the same procedure you would use to calculate the cross-section from a hand-drawn sketch.
- Status