HY8:Discharge Data

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Discharge Data

There are options to enter discharge data into HY-8: "Minimum, Design, and Maximum", "User-Defined", and "Recurrence". The "Minimum, Design, and Maximum" is the default option and historically was the only option available.

Minimum, Design, and Maximum

HY-8 will perform culvert hydraulic calculations based on the input minimum, design, and maximum discharge values. Calculations comprising the performance curve are made for ten equal discharge intervals between the minimum and maximum values. A user may input a narrower range of discharges in order to examine culvert performance for a discharge interval of special interest.

MINIMUM DISCHARGE

Lower limit used for the culvert performance curve. Can be edited to a number greater than '0'.

DESIGN DISCHARGE

Discharge for which the culvert will be designed. Always included as one of the points on the performance curve.

MAXIMUM DISCHARGE

Upper limit used for the culvert performance curve.


User-Defined

The user first specifies the number of flows they wish to enter. The user then enters the flows in ascending order (smallest flows at the top, highest at the bottom). The user can assign a name to a flow if desired. If no name is given the name column will not be shown in the results or report.


Recurrence

The user simply specifies the flow next to the recurrence year. The user does not need to enter all the years in the table and any flows that are left at zero will not show up in the results or report.

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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