Geometric Calculations for Non-Circular Open Channels

Compute hydraulic radius, wetted perimeter, and area for trapezoidal, rectangular, and triangular open channels

Non-circular open channel geometry calculation is mobile-device-friendly as of September 2, 2014

 Select calculation: Rectangular Cross-Section Trapezoidal Cross-Section Triangular Cross-Section Depth, y (L): © 2014 LMNO Engineering, Bottom Width, b (L): Research, and Software, Ltd. Side Slope, z (H:V): http://www.LMNOeng.com Area, A (L2): Wetted Perimeter, P (L): Hydraulic Radius, R (L): Top Width, T (L):

Units in open channel geometry calculator: You may enter numbers in any units, so long as you are consistent. (L) means that the variable has units of length (e.g. meters). (L2) means that the variable has units of length squared (e.g. m2).

Diagram and Equations for open channel geometry calculator:

z is side slope of trapezoidal and triangular channels, defined as horizontal to vertical ratio. Both sides of the channel are assumed to have the same side slope.

Equations (note that R=A/P):

The non-circular open channel geometry calculation does not check for unreasonable inputs. Please enter positive values.

LMNO Engineering, Research, and Software, Ltd.
7860 Angel Ridge Rd.   Athens, Ohio 45701  USA   Phone and fax: (740) 592-1890
LMNO@LMNOeng.com    http://www.LMNOeng.com

To:

Manning Equation Calculator

Design of Trapezoidal Open Channels Calculator

Design of Rectangular Open Channels Calculation

Unit Conversions

Other information:

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