HY8:Outlet Control Computations: Difference between revisions

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[[Image:OutletControlFlowchart.png]]
[[Image:OutletControlFlowchart.png|500px]]






{{HY8Main}}
{{HY8Main}}

Revision as of 17:05, 5 October 2011

Outlet control means that the amount of water the culvert barrel can carry is limited by the barrel and/or tailwater conditions downstream. As a result, the flow in the barrel is subcritical, and the energy equation may be used to find the upstream headwater depth. Several flow profiles are possible and are shown below and on page 32 of HDS-5. The following correlations apply to HY-8: Type A in HDS-5 is Type 4 in HY-8, Type B in HDS-5 is Type 3 in HY-8; Type C in HDS-5 is Type 6 in HY-8, Type D in HDS-5 is Type 7 in HY-8, and Type E in HDS-5 is Type 2 in HY-8. Descriptions of these flow types may be found in HY-8 by selecting the “Flow Types” button from the Culvert Summary Table.


File:HY8image38.gif


The logic for determining flow type due to outlet control is shown below:


OutletControlFlowchart.png