Rating Table and Rating Curve

 

The rating table and rating curve display hydraulic variables and fish passage results with respect to a range of flow in the culvert. This allows the data to be evaluated across a wide range of flows that may be of interest in the crossing analysis. FishXing generates a table for a range of  0 cfs to 150% of the High Passage Flow (Qhp). If a higher flow is desired it is necessary to return to the Input Window and increase the High Passage Flow and re-calculate. However it should be noted that in this case the high passage flow will be incorrectly labeled in the rating curve.

See also: Customizing Tables and Graphs

 

Rating Table Variables

    Q (analysis)

For Multiple Culvert Analyses Only: Analysis  Flow Rate represents the flow in the culvert that is being analyzed for fish passage.

 

    % Q total

For Multiple Culvert Analyses Only: Percent Q Total is the percent of the total flow in the culvert that is being analyzed for fish passage.

 

    Q (Culvert # 1-5)

For Multiple Culvert Analyses Only: Flow in each of the culverts that are not being analyzed for fish passage.

 

    Depth - Normal

Depth at Normal flow for range of flow rates.

 

    Depth - Critical

Depth at Critical flow for range of flow rates.

 

    Depth - Minimum

Shallowest Depth in the culvert for range of flow rates.

 

    Depth Minimum Barrel

Shallowest Depth in the culvert excluding the inlet and outlet for range of flow rates.

 

    Depth - Inlet

Depth at first node inside the culvert inlet for range of flow rates.

 

    Depth - Midpoint

Depth at culvert midpoint for range of flow rates.

 

    Depth - Outlet

Depth at last node inside the culvert outlet for range of flow rates.

 

    Depth - Tailwater

Depth of tailwater from culvert invert for range of flow rates. Negative value indicates tailwater is below the invert.

 

    Depth - Pool

Depth of the outlet pool for range of flow rates.

 

    Velocity - Normal

Velocity at Normal flow for range of flow rates.

 

    Velocity Maximum

Maximum velocity in the culvert for range of flow rates.

 

    Velocity Max Barrel

Maximum velocity in the culvert barrel excluding inlet and outlet for range of flow rates.

 

    Velocity - Inlet

Velocity at the first node inside the culvert inlet for range of flow rates.

 

    Velocity - Midpoint

Velocity at the culvert midpoint for range of flow rates.

 

    Velocity - Outlet

Velocity at the last node inside the culvert outlet for range of flow rates.

 

    V(occ) - Max

Maximum occupied (or reduced) velocity for range of flow rates.

 

    V(occ) - Inlet

Occupied (or reduced) velocity at first node inside the culvert inlet for range of flow rates.

 

    V(occ) - Midpoint

Occupied (or reduced) velocity at culvert midpoint for range of flow rates.

 

    V(occ) - Outlet

Occupied (or reduced) velocity at the last node inside the culvert outlet for range of flow rates.

 

    Outlet Water Surface Drop

Height of water surface drop at outlet for range of flow rates. Measured from the water surface elevation at the outlet and outlet pool water surface.

 

    Vertical Leap Distance

Distance (height) fish is required to leap to enter the culvert outlet (same as Outlet Water Surface Drop) for range of flow rates. The Vertical and Horizontal leaping distances are predicted from projectile equations. To calculate the vertical leap distance, FishXing assumes that the fish leaps from the outlet pool water surface and lands flat on the water surface in the culvert outlet. See leaping information in Fish Performance.

 

    Horizontal Leap Distance

Horizontal distance the fish must leap to enter the culvert outlet for range of flow rates. The Vertical and Horizontal leaping distances are predicted from projectile equations. The Horizontal Leap distance is calculated from the distance that the plunging water travels from the culvert outlet to the outlet pool. See leaping information in Fish Performance.

 

    Required Leap Speed

Speed at which the fish must exit the water in order to successfully leap into the culvert for range of flow rates.See leaping information in Fish Performance.

 

    Leap Angle

Angle at which the fish must exit the water in order to successfully leap into the culvert for range of flow rates.See leaping information in Fish Performance.

 

    Prolonged Time

The time that the analysis fish spends in Prolonged Swimming Mode for range of flow rates.

 

    Burst Time

The time that the analysis fish spends in Burst Swimming Mode (darting speed) for range of flow rates.

 

    Length of Swim

Total length the fish swims in the culvert before either successful negotiation or failure for range of flow rates.

 

    % Length of Swim

Percent of the total culvert length the fish swims before either successful negotiation (100%) or failure for range of flow rates.

 

    Barrier Type

List of conditions where fish passage criteria was not met for range of flow rates. (Not available on rating curve.)

 

    Head Loss - Inlet

Head loss at the culvert inlet for range of flow rates.

 

    Head Loss - Total

Total head loss from the culvert inlet to outlet for range of flow rates.

 

    Headwater Elevation

Absolute elevation of culvert headwater (referenced to user-input elevations) for range of flow rates.

 

    Headwater Depth

Depth of headwater from culvert inlet invert for range of flow rates.

 

    Culvert Freeboard

The difference between the height of the culvert and the headwater depth for range of flow rates.

 

    HW/D Ratio

The ratio of headwater depth and culvert height (diameter for a round culvert) for range of flow rates.

 

    Hydraulic Control

Is the culvert under inlet or outlet control for range of flow rates. (Not available on rating curve.)

 

    Tailwater Elevation

Absolute elevation of the tailwater pool for range of flow rates.

 

    Tailwater Cross Section Max Depth

For input tailwater cross-sections only: Maximum Depth of flow at the tailwater cross-section for range of flow rates.

 

    Tailwater Cross Section Velocity

For input tailwater cross-sections only: Velocity of flow at the tailwater cross-section for range of flow rates.

 

    Tailwater Cross Section Wetted Area

For input tailwater cross-sections only: Wetted area at the tailwater cross-section for range of flow rates.

 

    Tailwater Cross Section Wetted Perimeter

For input tailwater cross-sections only: Wetted perimeter at the tailwater cross-section for range of flow rates.

 

    Tailwater Cross Section Composite Roughness

For input tailwater cross-sections only: Composite mannings roughness coefficient at the tailwater cross-section for range of flow rates. See Composite Roughness.

 

    Slope Type

Slope type is a hydraulic parameter based on the culvert gradient and the relationship between water depth, normal depth, and critical depth. (Not available on rating curve.)

 

    Critical Slope

The culvert slope that would result in critical flow for range of flow rates.

 

    Water Surface Slope

Overall slope of the water surface from inlet to outlet for range of flow rates.

 

    Shear Stress - Maximum

Maximum shear stress in culvert for range of flow rates.

 

    Shear Stress - Inlet

Shear stress at the inlet for range of flow rates.

 

    Shear Stress - Midpoint

Shear stress at the culvert midpoint for range of flow rates.

 

    Shear Stress - Outlet

Shear stress at the culvert outlet for range of flow rates.

 

    Stream Power - Maximum

Maximum stream power in culvert for range of flow rates.

 

    Stream Power - Inlet

Stream power at the inlet for range of flow rates.

 

    Stream Power - Midpoint

Stream power at the culvert midpoint for range of flow rates.

 

    Stream Power - Outlet

Stream power at the outlet for range of flow rates.

 

    EDF - Maximum

Maximum Energy Dissipation Factor in the culvert for range of flow rates.

 

    EDF - Inlet

Energy Dissipation Factor at the inlet for range of flow rates.

 

    EDF - Midpoint

Energy Dissipation Factor at the culvert midpoint for range of flow rates.

 

    EDF - Outlet

Energy Dissipation Factor at the outlet for range of flow rates.

 

    Pool Depth/Drop Height

Ratio of outlet pool depth and water surface drop height for range of flow rates.

 

    Length of Depth Barrier

Total length of depth barrier for range of flow rates.