Figure 1 240386266 displays the Hydraulic Structure Boundary Conditions form. In this form the user can create or edit hydraulic structures (HS) such as culverts, weirs, sluice gates, and orifices with the physical dimensions of the structures and use the corresponding HS boundary group, assign the appropriate HS equations, as well as defining a flow series for the structure.
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A model will typically be configured to use grid masks to prevent flow except where the hydraulic structure is located, with the structure allowing flow across the mask.
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Figure 1. Hydraulic Structure Boundary Conditions form.
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The details of how to configure and use the equation-based structures and flow table based hydraulic structures are described in the Flow Derived Hydraulic Structures section.
The Time Control drop-down menu is only enabled when the sluice gate option in Flow Control Type is selected. The options available in this menu are as summarized in the table below
Name | Meaning |
Uncontrolled Structure | The hydraulic structure is uncontrollable type. The previous method of flow computational using lookup table or equation will be used |
Controlled using Time-Series | The operation of the hydraulic structure is controlled using a time-series which defines the changes with time of gate openings or rating curves |
Controlled based on Upstream Elevation | The operation of the hydraulic structure is controlled using control rules defined based on water surface elevation at an upstream location. This location can be different from the upstream cell of the structure. |
Controlled based on Head Difference | The operation of the hydraulic structure is controlled using control rules defined based on the difference of water surface elevations at two locations upstream and downstream of the structure. These locations can be different from the upstream and downstream cells of the structure. |
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