**2.3.1 Flow Calculator (Simple in Innovyze H2OCalc)**

The Flow Calculator category performs hydraulic calculations for the following elements: Circular Channel, Rectangular Channel, Triangular Channel, Trapezoidal Channel, Irregular Channel, and Pressurized Pipe.

**Circular Channel**

The circular channel dialog box is shown below.

Input for circular channel:

**Flow Unit**– Select the desired flow unit.**Head Loss Equation**– Choose between the Manning, Kutter, Darcy-Weisbach (Colebrook-White) and Hazen-Williams friction loss calculation methods.**Solving Target**– Select the hydraulic parameter to solve for.**Coefficient**– The channel roughness coefficient.**Slope**– Channel longitudinal slope.**Depth**– Channel normal depth.**Diamete**r – Circular channel inside diameter.

Output for circular channel:

**Flow Area**– Flow cross-sectional area.**Wetted Perimeter**– Channel wetted perimeter.**Hydraulic Radius**– Flow area divided by the wetted perimeter.**Velocity**– Flow velocity.**Velocity Head**– Energy of flow velocity.**Top Width**– Length of free top water surface (zero for full flow condition).**Critical Depth**– Depth of water under minimum specific energy.**Critical Slope**– Channel slope under critical depth.**Specific Energy**– Velocity head plus pressure head.**Froude Number**– Flow characteristics dimensionless parameter.**Flow Type**– Subcritical or supercritical flow characteristics in channel.**Percent Full**– Percentage of actual channel flow depth based on full flow.**Full Discharge**– Channel flow rate when flowing full.**Full Slope**– Channel slope under full flow.**Maximum Discharge**– Flow rate when flow depth equals 0.938 times circular channel diameter (applies only to circular channel).**Discharge (Q)**– Uniform channel flow rate.

**Rectangular Channel**

The rectangular channel dialog box is shown below.

Input for rectangular channel:

**Flow Unit**– Select the desired flow unit.**Head Loss Equation**– Choose between the Manning, Kutter, Darcy-Weisbach (Colebrook-White) and Hazen-Williams friction loss calculation methods.**Solving Target**– Select the hydraulic parameter to solve for.**Coefficient**– The channel roughness coefficient.**Slope**– Channel longitudinal slope.**Depth**– Channel normal depth.**Bottom Width**– Width of the channel.

Output for rectangular channel:

**Flow Area**– Wetted area.**Wetted Perimeter**– Channel wetted perimeter.**Hydraulic Radius**– Flow area divided by the wetted perimeter.**Velocity**– Flow velocity.**Velocity Head**– Energy of flow velocity.**Top Width**– Length of free top water surface (same as bottom width at all depths).**Critical Depth**– Depth of water under minimum specific energy.**Critical Slope**– Channel slope under critical depth.**Specific Energy**– Velocity head plus pressure head.**Froude Number**– Flow characteristics dimensionless parameter.**Flow Type**– Subcritical or supercritical flow characteristics in channel.**Discharge (Q)**– Uniform channel flow rate.

**Triangular Channel**

The triangular channel dialog box is shown below.

Input for triangular channel:

**Flow Unit**– Select the desired flow unit.**Head Loss Equation**– Choose between the Manning, Kutter, Darcy-Weisbach (Colebrook-White) and Hazen-Williams friction loss calculation methods.**Solving Target**– Select the hydraulic parameter to solve for.**Coefficient**– The channel roughness coefficient.**Slope**– Channel longitudinal slope.**Depth**– Channel normal depth.**Left Side Slope**– Horizontal increase in channel width per unit increase in depth (H: 1V) for the left side of the channel.**Right Side Slope**– Horizontal increase in channel width per unit increase in depth (H: 1V) for the right side of the channel.

Output for triangular channel:

**Flow Area**– Wetted area.**Wetted Perimeter**– Channel wetted perimeter.**Hydraulic Radius**– Flow area divided by the wetted perimeter.**Velocity**– Flow velocity.**Velocity Head**– Energy of flow velocity.**Top Width**– Length of free top water surface.**Critical Depth**– Depth of water under minimum specific energy.**Critical Slope**– Channel slope under critical depth.**Specific Energy**– Velocity head plus pressure head.**Froude Number**– Flow characteristics dimensionless parameter.**Flow Type**– Subcritical or supercritical flow characteristics in channel.**Discharge (Q)**– Uniform channel flow rate.

**Trapezoidal Channel**

The trapezoidal channel dialog box is shown below.

Input for trapezoidal channel:

**Flow Unit**– Select the desired flow unit.**Head Loss Equation**– Choose between the Manning, Kutter, Darcy-Weisbach (Colebrook-White) and Hazen-Williams friction loss calculation methods.**Solving Target**– Select the hydraulic parameter to solve for.**Coefficient**– The channel roughness coefficient.**Slope**– Channel longitudinal slope.**Depth**– Channel normal depth.**Bottom Width**– Bed width of the channel.**Left Side Slope**– Horizontal increase in channel width per unit increase in depth (H: 1V) for the left side of the channel.**Right Side Slope**– Horizontal increase in channel width per unit increase in depth (H: 1V) for the right side of the channel.

Output for trapezoidal channel:

**Flow Area**– Wetted area.**Wetted Perimeter**– Channel wetted perimeter.**Hydraulic Radius**– Flow area divided by the wetted perimeter.**Velocity**– Flow velocity.**Velocity Head**– Energy of flow velocity.**Top Width**– Length of free top water surface.**Critical Depth**– Depth of water under minimum specific energy.**Critical Slope**– Channel slope under critical depth.**Specific Energy**– Velocity head plus pressure head.**Froude Number**– Flow characteristics dimensionless parameter.**Flow Type**– Subcritical or supercritical flow characteristics in channel.**Discharge (Q)**– Uniform channel flow rate.

**Irregular Channel**

The irregular channel dialog box is shown below.

Input for irregular channel:

**Flow Unit**– Select the desired flow unit.**Head Loss Equation**– Choose between the Manning, Kutter, Darcy-Weisbach (Colebrook-White) and Hazen-Williams friction loss calculation methods.**Solving Target**– Select the hydraulic parameter to solve for.**Slope**– Channel longitudinal slope.**Water Surface Elevation**– Elevation corresponding to the water depth.**Channel Cross**Section – Station vs. Elevation data that represents shape of the channel. The*Edit Section*button initiates the irregular channel editor shown below.**Left Bank****Coefficient**– Roughness coefficient for the left bank of the channel.**Right Bank****Coefficient**– Roughness coefficient for the right bank of the channel.**Channel Coefficient**– Roughness coefficient for the main (center) channel.**Main Channel Bank Stations**– Stations at which the main channel ends and the banks start from either side of the channel (i.e., left and right).

Output for irregular channel:

**Flow Area**– Wetted area.**Wetted Perimeter**– Channel wetted perimeter.**Hydraulic Radius**– Flow area divided by the wetted perimeter.**Velocity**– Flow velocity.**Velocity Head**– Energy of flow velocity.**Top Width**– Length of free top water surface.**Critical Depth**– Depth of water under minimum specific energy.**Critical Slope**– Channel slope under critical depth.**Specific Energy**– Velocity head plus pressure head.**Froude Number**– Flow characteristics dimensionless parameter.**Flow Type**– Subcritical or supercritical flow characteristics in channel.**Depth**– Flow depth.**Elevation****Range**– Difference in elevations at the top and at the bottom of the channel.**Discharge (Q)**– Uniform channel flow rate.

The dialog box for irregular channel cross-section editor is shown below. The inputs are described above along with the irregular channels inputs.

**Pressurized Pipe**

The pressurized pipe calculator applies the energy equation between two points (points 1 and 2) and evaluates the outputs listed below. The pressurized pipe dialog box is shown below.

Input for pressurized pipe:

**Flow Unit**– Select the desired flow unit.**Head Loss Equation**– Choose between the Manning, Kutter, Darcy-Weisbach (Colebrook-White) and Hazen-Williams friction loss calculation methods.**Solving Target**– Select the hydraulic parameter to solve for.**Coefficient**– The channel roughness coefficient.**Diameter**– Circular pipe diameter.**Length**– Pipe length.**Pressure at 1**– Pressure at the upstream end of the pipe.**Pressure at 2**– Pressure at the downstream end of the pipe.**Elevation at 1**– Elevation at the upstream end of the pipe.**Elevation at 2**– Elevation at the downstream end of the pipe.

Output for pressurized pipe:

**Flow Area**– Wetted area.**Wetted Perimeter**– Channel wetted perimeter.**Hydraulic Radius**– Flow area divided by the wetted perimeter.**Velocity**– Flow velocity.**Velocity Head**– Energy of flow velocity.**Head Loss**– Energy loss due to friction.**Energy Grade at 1**– Total energy head (i.e., sum of pressure head, velocity head, and elevation head) at the upstream end.**Energy Grade at 2**– Total energy head (i.e., sum of pressure head, velocity head, and elevation head) at the downstream end.**Hydraulic Grade at 1**– Sum of pressure head and elevation head at the upstream end.**Hydraulic Grade at 2**– Sum of pressure head and elevation head at the upstream end.**Friction Slope**– Slope of the head loss due to friction between sections 1 and 2.**Discharge (Q)**– Pipe flow rate.

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