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## HYDRUS Projects - Drip3D

**Project Group:**Drip3D**Description:**Drip irrigation simulated using the three-dimensional transport domain. Described in Kandelous et al. (2011).**Availability:**Download HYDRUS projects now (10.6 MB)

### Brief comments:

- To reduce the calculation time we consider the symmetry of soil water distribution and simulate only half of the domain (see Figure 5).
- We used an Opening to represent the dripper in the definition of the transport domain.
- We divided the domain in the y-direction (lateral) into two (non-even) Sub-layers, allowing us to define a small part of the lateral as an emitter.
- After these steps were done, we have in the Section tab:

a. Mesh Layers: representing the mesh-layers along the y axis. Their number can be modified (reduced or increased) by changing the number of FE-Mesh layers (default is 20) using the command Edit Solid.

b. Columns: representing different parts of the domain separated by an Opening (soil domain and a lateral).

c. Sub-Layers: representing the division of the domain described in point 3 above.

d. Inter-sections: different combinations of b and c, such that one can display only the emitter.

e. The last Inter-section allows us to select easily the emitter when defining the boundary conditions. - Before running the simulation, one can define the Cross-sections so that one can display charts of continuous water content/matric potential along a selected cross-section (here 3 cross-sections, as described in the paper).
- How to obtain the area associated with specified BCs? Run HYDRUS for few time steps, press Ctrl+c to stop the code, and find the required information in the output file Boundary.out. Use this area to specify the boundary flux, so that you get the exact drip discharge.

### References:

Kandelous, M. M., J. Šimůnek, M. Th. van Genuchten, and K. Malek, Soil water content distributions between two emitters of a subsurface drip irrigation system, Soil Science Society of America Journal, 75(2), 488497, 2011.