Description

Given the basic characteristics of a trapezoidal channel in uniform flow, calculate:

• Normal flow depth
• Flow
• Roughness coefficient ($n$)
• Slope

Calculation Methods

• Depth

  • Inputs

    Parameter	Default Unit	Description
    Flow ($Q$)	$m^3/s$	Volumetric flow rate
    Inferior width ($b$)	$m$	Base width of the channel
    $Z1$	-	Left side slope
    $Z2$	-	Right side slope
    Slope ($I$)	-	Channel slope
    Roughness coefficient ($n$)	-	Channel roughness

  • Outputs

    Parameter	Default Unit	Description
    Normal flow depth ($y$)	$m$	Computed flow depth
    Superior width ($B$)	$m$	Total width at the top of the channel
    Velocity ($U$)	$m/s$	Average flow velocity
    $U^2/2g$	-	Energy term per unit mass

• Flow

  • Inputs

    Parameter	Default Unit	Description
    Depth ($y$)	$m$	Flow depth
    Inferior width ($b$)	$m$	Base width of the channel
    $Z1$	-	Left side slope
    $Z2$	-	Right side slope
    Slope ($I$)	-	Channel slope
    Roughness coefficient ($n$)	-	Channel roughness

  • Outputs

    Parameter	Default Unit	Description
    Flow ($Q$)	$m^3/s$	Computed flow rate
    Superior width ($B$)	$m$	Total width at the top of the channel
    Velocity ($U$)	$m/s$	Average flow velocity
    $U^2/2g$	-	Energy term per unit mass

• Inferior width ($b$)

  • Inputs

    Parameter	Default Unit	Description
    Depth ($y$)	$m$	Flow depth
    Flow ($Q$)	$m^3/s$	Volumetric flow rate
    $Z1$	-	Left side slope
    $Z2$	-	Right side slope
    Slope ($I$)	-	Channel slope
    Roughness coefficient ($n$)	-	Channel roughness

  • Outputs

    Parameter	Default Unit	Description
    Inferior width ($b$)	$m$	Base width of the channel
    Superior width ($B$)	$m$	Total width at the top of the channel
    Velocity ($U$)	$m/s$	Average flow velocity
    $U^2/2g$	-	Energy term per unit mass

• Roughness coefficient ($n$)

  • Inputs

    Parameter	Default Unit	Description
    Depth ($y$)	$m$	Flow depth
    Flow ($Q$)	$m^3/s$	Volumetric flow rate
    Inferior width ($b$)	$m$	Base width of the channel
    $Z1$	-	Left side slope
    $Z2$	-	Right side slope
    Slope ($I$)	-	Channel slope

  • Outputs

    Parameter	Default Unit	Description
    Roughness coefficient ($n$)	-	Computed channel roughness
    Superior width ($B$)	$m$	Total width at the top of the channel
    Velocity ($U$)	$m/s$	Average flow velocity
    $U^2/2g$	-	Energy term per unit mass

• Slope ($I$)

  • Inputs

    Parameter	Default Unit	Description
    Depth ($y$)	$m$	Flow depth
    Flow ($Q$)	$m^3/s$	Volumetric flow rate
    Inferior width ($b$)	$m$	Base width of the channel
    $Z1$	-	Left side slope
    $Z2$	-	Right side slope
    Roughness coefficient ($n$)	-	Channel roughness

  • Outputs

    Parameter	Default Unit	Description
    Slope ($I$)	-	Computed channel slope
    Superior width ($B$)	$m$	Total width at the top of the channel
    Velocity ($U$)	$m/s$	Average flow velocity
    $U^2/2g$	-	Energy term per unit mass