HY8:Channel Shape

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There are three available channel shapes to define the downstream tailwater channel: rectangular, trapezoidal, and triangular. When selecting a channel shape the input window adjusts to display only those parameters required for the defined shape. When defining a channel shape, the following channel properties are required for analysis:

Bottom Width -- Width of channel at downstream section, shown in drawing below.

Side Slope (H:V) (_:1) -- This item applies only for trapezoidal and triangular channels. The user defines the ratio of Horizontal/Vertical by entering the number of horizontal units for one unit of vertical change.

Channel Slope -- Slope of channel in m/m or ft/ft. If a zero slope is entered, an error message appears upon exiting the input data window. The user must enter a slope greater than zero before the crossing may be analyzed.

Manning's 'n' -- User defined MANNING'S roughness coefficient for the channel.

Channel Invert Elevation -- User must enter elevation. Program will show actual barrel #1 outlet invert elevation


HY8Tailwater.jpg


HY8Channel Shape.jpg


v • e
HY-8
Introduction:Getting Started   •   Layout   •   Vena Contracta   •   Building a Project   •   Locate Project   •   Culvert Crossing Data   •   Run Analysis   •   Report Generation
Crossing and Culvert Data:Crossings   •   Discharge Data   •   Roadway Data   •   Tailwater Data   •   Irregular Channel   •   Culvert Data   •   Site Data   •   Culvert Invert Data   •   Embankment Toe Data
AnalysisProject Units   •   Roadway Overtopping   •   Inlet Control Computations   •   Outlet Control Computations   •   Tables and Plots
Energy DissipationScour Hole Geometry   •   Increased Resistance   •   Tumbling Flow   •   USBR Type IX Baffled Apron   •   Drop Structures   •   Stilling Basins   •   Streambed Level Structures
MethodsAquatic Organism Passage   •   Low Flow Hydraulics
TroubleshootingDifferences from DOS HY-8   •   Limitations   •   HY-8 User Manual
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