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, DarcyWeisbach (ColebrookWhite) and HazenWilliams 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.
 Diameter – Circular channel inside diameter.
Output for circular channel:
 Flow Area – Flow crosssectional 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, DarcyWeisbach (ColebrookWhite) and HazenWilliams 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, DarcyWeisbach (ColebrookWhite) and HazenWilliams 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, DarcyWeisbach (ColebrookWhite) and HazenWilliams 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, DarcyWeisbach (ColebrookWhite) and HazenWilliams 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 crosssection 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, DarcyWeisbach (ColebrookWhite) and HazenWilliams 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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