TUFLOW 1D Channels and Hydraulic Structures: Difference between revisions

==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 can be reviewed in 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>

 

TUFLOW extends the ‘elevation vs nodal area’ table by 5 m (the last 2 numbers in the table above), which allows for the calculation of pressurised pipe flow when a manhole is drowned. If the maximum 1D water level is higher than the DEM, that means the manhole was drowned and pressurised during the peak of the flood. <br>

 

==How to represent the hydraulic behavior at the outlet of a pipe, including headwalls and transitions to open channels? ==