TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions
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<li>Use the Elevation (Head) vs Discharge pairs to populate the HQ table.
==Why is the maximum 1D water level higher than 2D water level?==
TUFLOW calculates storage at 1D nodes (including manholes) and calculates flux at pipe mid-sections. The storages at the manholes are saved in the format of ‘elevation vs nodal area’ tables, which you can check from the .eof file:<br>
[[File:1DpitHmax 1.png]] <br>
The change in water volume in a manhole is calculated based on the inflow from the pit above (if there is one) and the inflow/outflow from the connected pipes. The change in water level is then calculated based on the change in volume and the nodal area at that elevation.<br>
[[File:1DpitHmax 2.png | 300px ]] <br>
TUFLOW extends the ‘elevation vs nodal area’ table by 5 m (as you can see from the last 2 numbers in the table above), which allows for the calculation of pressurised pipe flow when a manhole is drawn. If the maximum 1D water level is higher than the dem, that means the manhole was drawn and pressurised during the peak of the flood. Water could surcharge from the pit (if a pit was located at the manhole) if the 1D pressure level was higher than the 2D water level.<br>
[[File:1DpitHmax 3.png | 300px ]] <br>
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