hydraulics

Flow Calculator (Simple in Innovyze H2OCalc) – Option for SWMM6?


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.
  • Diameter – 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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