Free Online Manning Formula Trapezoidal Channel Calculator

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Manning Formula Uniform Trapezoidal Channel Flow at Given Slope and Depth

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Inputs

Bottom width		X
צד השיפוע 1 (אופקי\אנכי)		X
צד השיפוע 2 (אופקי\אנכי)		X
מקדם מאנינג ? Strickler B/B (See notes)		X
שיפוע התעלה		X
עומק הספיקה		X
Bend Angle ? (for riprap sizing)		X
Rock specific gravity (2.65)		X
Design rock size, D50 Isbash Maynord Searcy * (See notes)		X

תוצאות:

חתך הזרימה	חתך הזרימה	X
ההיקף הרטוב	ההיקף הרטוב	X
רדיוס הידראולי	רדיוס הידראולי	X
מהירות	מהירות	X
ספיקה	ספיקה	X
עומד הידראולי	עומד הידראולי	X
רוחב פני הנוזל	רוחב פני הנוזל	X
מספר פראוד	מספר פראוד	X
Average shear stress (tractive force), tau	Average shear stress (tractive force), tau	X
n for design rock size per Strickler	n for design rock size per Strickler	X
n for design rock size per Blodgett	n for design rock size per Blodgett	X
n for design rock size per Bathurst	n for design rock size per Bathurst	X
Blodgett vs. Bathurst	Blodgett vs. Bathurst	X
Required bottom angular riprap size, D50, Maricopa County	Required bottom angular riprap size, D50, Maricopa County	X
Required side slope 1 angular riprap size, D50, Maricopa County	Required side slope 1 angular riprap size, D50, Maricopa County	X
Required side slope 2 angular riprap size, D50, Maricopa County	Required side slope 2 angular riprap size, D50, Maricopa County	X
Required angular riprap size, D50, per Maynord, Ruff, and Abt (1989)	Required angular riprap size, D50, per Maynord, Ruff, and Abt (1989)	X
Required angular riprap size, D50, per Searcy (1967)	Required angular riprap size, D50, per Searcy (1967)	X

Notes:

Automated rock size and roughness design iteration: Choose a roughness radio button (BB recommended) and a design rock size radio button (Isbash recommended). Fine-tune depth and rock size safety factor to get your desired flow with an even rock size. Every time you change any input value, the following iteration cycle happens: 1. Roughness is calculated from design rock size. 2. The requested roughness calculation is copied to input roughness. 3. Channel flow and required rock size are calculated. 4. Design rock size is adjusted. 5. Repeat until error in the design rock size is very small.
Basic calculator (no iteration): Enter your desired roughness value. Ignore the design rock size input area.