§378.APPENDIX D. Manning Equation

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V = 1.49 R_h^2/3 S^1/2

Q = 1.49 AR_h^2/3 S^1/2

where:	Q	is the discharge in cfs
	V	is the average velocity in fps.
	A	is the cross-sectional area of the stream in square feet.
	R_h	is the hydraulic radius of the stream in feet, as
		determined by the cross-sectional area (A) divided by the
		wetted perimeter.
	S	is the slope of the stream in decimal form.
	n	is the Manning coefficient.

                    
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