The open channel flow calculator
Select Channel Type: Trapezoid Triangle Rectangle Circle
Select parameter for solving Velocity(V)&Discharge(Q) Channel slope from V Channel slope from Q Manning Coefficient from V Manning Coefficient from Q Depth from Q RightSlope from Q Even slope from Q LeftSlope from Q	Select unit system: Feet(ft) Meter(m)

Channel slope:	Water depth(y):
Flow velocity	LeftSlope (z1):	RightSlope (z2):
Flow discharge	Input n value clean,uncoated castiron:0.014 clean,coated cast iron:0.013 dirty, tuberculed cast iron:0.015-0.035 riveted steel:0.015-0.017 lock-bar and welded:0.012-0.013 galvanized iron:0.015-0.017 brass and glass:0.009-0.013 WOOD STAVE with - (1). small diameter:0.011-0.012 (2). large diameter:0.012-0.013 CONCRETE with - (1). rough joints:0.016-0.017 (2). dry mix, rough forms:0.015-0.016 (3). wet mix, steel forms:0.012-0.014 (4). very smooth, finished:0.011-0.012 vitrified sewer:0.013-0.015 common-clay drainage tile:0.012-0.014 asbestos:0.011 planed timber:0.011 canvas:0.012 unplaned timber:0.014 brick:0.016 rubble masonry:0.017 smooth earth:0.018 firm gravel:0.023 corrugated metal pipe:0.022 natural channels good condition:0.025 NATURAL CHANNELS with - with stones and weeds:0.035 very poor natural channels:0.060
	Status:
Wetted perimeter	Flow area	Top width(T)
Specific energy	Froude number	Flow status
Critical depth	Critical slope	Velocity head

Copyright 2007 (updated) by Dr. Xing Fang (xing.fang@auburn.edu), Department of Civil and Environmental Engineering, Auburn University, Alabama, USA.