Description

Given the basic characteristics of a rectangular channel in uniform flow, this calculation determines the normal flow depth, flow rate, roughness coefficient $n$, or slope.

Calculation modes:

• Depth (y): Given the flow rate ($Q$), width ($b$), slope ($I$), and roughness coefficient ($n$), calculates the normal flow depth and velocity.
• Flow (Q): Given the depth ($y$), width ($b$), slope ($I$), and roughness coefficient ($n$), calculates the flow rate and the $U²/2g$ relation.
• Width (b): Given the depth ($y$), flow rate ($Q$), slope ($I$), and roughness coefficient ($n$), calculates the width and the $U²/2g$ relation.
• Roughness coefficient (n): Given the depth ($y$), flow rate ($Q$), slope ($I$), and width ($b$), calculates the roughness coefficient and the $U²/2g$ relation.
• Slope (I): Given the depth ($y$), flow rate ($Q$), width ($b$), and roughness coefficient ($n$), calculates the slope and the $U²/2g$ relation.

Input and output parameters table (Depth mode):

Parameter	Standard Units	Description
Flow ($Q$)	m³/s	Flow rate
Width ($b$)	m	Channel width
Slope ($I$)	-	Channel slope
Roughness coefficient ($n$)	-	Channel roughness coefficient
Normal flow depth ($y$)	m	Calculated normal flow depth
Velocity ($U$)	m/s	Flow velocity