HY8:Inlet Depression: Difference between revisions

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The fall or depression of a culvert is the vertical drop of the inlet control section below the stream bed.  An inlet depression is defined by entering a value for each of the following items (see drawing below):
The depression of a culvert is the vertical drop of the inlet control section below the stream bed.  An inlet depression is defined by entering a value for each of the following items (see drawing below):
 
*Depression
*Depression
*Fall Slope
*Depression Slope
*Crest Width
*Crest Width


===Depression===
 
The vertical drop of inlet control section below the stream bed.
===DEPRESSION===
 
The vertical drop of inlet control section below the stream bed.
 
 
===FALL SLOPE===


Slope between the stream bed and the face invert.  The fall slope must be set between 2:1 and 3:1.
===Depression Slope===
Slope between the stream bed and the face invert.  The depression slope must be set between 2:1 and 3:1.


 
===Crest Width===
===CREST WIDTH===
Length of weir crest at the top of the depression slope.  Designing the crest width becomes an iterative process in HY-8 as the user must select a crest width wide enough so that it does not control the headwater calculations.  If the selected crest width is not wide enough the crest section will produce a higher headwater elevation than the culvert throat.  The user must continue to increase the crest width and run the analysis until the headwater depth ceases to change with increasing crest width.  Once this occurs the crest section no longer controls and may be used in analysis and construction.


Length of weir crest at the top of the fall slope.  Designing the crest width becomes an iterative process in HY-8 as the user must select a crest width wide enough so that it does not control the headwater calculations.  If the selected crest width is not wide enough the crest section will produce a higher headwater elevation than the culvert throat.  The user must continue to increase the crest width and run the analysis until the headwater depth ceases to change with increasing crest width.  Once this occurs the crest section no longer controls and may be used in analysis and construction.
[[Image:HY8Inlet%20Depression.png|400 px]]
 
[[Image:HY8Inlet%20Depression.gif]]


   
   
{{hide in print|
{{HY8Main}}
==''Related Topics''==
[[Category:Culvert Data|I]]
 
===Introduction===
* [[WMS:HY-8|Introduction]]
===Culvert Data===
====Culvert Data====
:* [[WMS:HY-8 Culvert Data|Culvert Data]]
:* [[WMS:HY-8 Shapes|Shapes]]
:* [[WMS:HY-8 Material|Material]]
:* [[WMS:HY-8 Plastic Pipe Materials|Plastic Pipe Materials]]
:* [[WMS:HY-8 Concrete Open Bottom Arch|Concrete Open-Bottom Arch]]
:* [[WMS:HY-8 Inlet Type|Inlet Type]]
:* [[WMS:HY-8 Inlet Edge Conditions|Inlet Edge Conditions]]
:* [[WMS:HY-8 Inlet Depression|Inlet Depression]]
:* [[WMS:HY-8 Embedment Depth|Embedment Depth]]
 
====Site Data====
:* [[WMS:HY-8 Site Data Input Option|Site Data Input Option]]
:* [[WMS:HY-8 Culvert Invert Data|Culvert Invert Data]]
:* [[WMS:HY-8 Embankment Toe Data|Embankment Toe Data]]
}}

Latest revision as of 15:13, 5 October 2016

The depression of a culvert is the vertical drop of the inlet control section below the stream bed. An inlet depression is defined by entering a value for each of the following items (see drawing below):

  • Depression
  • Depression Slope
  • Crest Width

Depression

The vertical drop of inlet control section below the stream bed.

Depression Slope

Slope between the stream bed and the face invert. The depression slope must be set between 2:1 and 3:1.

Crest Width

Length of weir crest at the top of the depression slope. Designing the crest width becomes an iterative process in HY-8 as the user must select a crest width wide enough so that it does not control the headwater calculations. If the selected crest width is not wide enough the crest section will produce a higher headwater elevation than the culvert throat. The user must continue to increase the crest width and run the analysis until the headwater depth ceases to change with increasing crest width. Once this occurs the crest section no longer controls and may be used in analysis and construction.

HY8Inlet Depression.png


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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