Free Online Manning Formula Trapezoidal Channel Calculator

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在特定斜率和深度的均勻梯形流動曼寧公式

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Inputs

Bottom width, b		X
Side slope 1 (horiz./vert.)		X
Side slope 2 (horiz./vert.)		X
曼寧粗造度係數, n? ? Strickler B/B (See notes)		X
Channel slope, S		X
Flow depth, y		X
Bend Angle ? (for riprap sizing)		X
Rock specific gravity (2.65)		X
Design rock size, D50 Isbash Maynord Searcy * (See notes)		X

結果:

流動面積	流動面積	X
濕周	濕周	X
水力半徑	水力半徑	X
流速, v	流速, v	X
流量,q	流量,q	X
速度壓頭, hv	速度壓頭, hv	X
頂部寬度, T	頂部寬度, T	X
Froude 數, F	Froude 數, F	X
Average 剪應力(牽引力), tau	Average 剪應力(牽引力), 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 rock size, D50 (Isbash & MC) ?	Required bottom angular rock size, D50 (Isbash & MC) ?	X
Required side slope 1 angular rock size, D50 (Isbash & MC) ?	Required side slope 1 angular rock size, D50 (Isbash & MC) ?	X
Required side slope 2 angular rock size, D50 (Isbash & MC) ?	Required side slope 2 angular rock size, D50 (Isbash & MC) ?	X
Required angular rock size, D50 (Maynord, Ruff, and Abt 1989)	Required angular rock size, D50 (Maynord, Ruff, and Abt 1989)	X
Required angular rock size, D50 (Searcy 1967)	Required angular rock size, D50 (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.