[<< wikibooks] HydroGeoSphere/Tile Drains
Tile drains, as outlined in Section 2.3.2.3, can be set up using the following instructions. Currently, this option requires that the system be variably-saturated.


== Default Tile Drain Properties ==
The default tile drain values, Table 5.9, can be and are recommended to be modified to fit the model application.

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== Example Tile Drain Instructions ==
As an example, the following set of instructions, with prefix.tprops file Figure 5.13, could be inserted into the prefix.grok file to produce a horizontal tile drain:
The tile domain example opens the property file prefix.tprops, shown in Figure 5.13, and creates a 28 m long screen between (15, 1, 2) and (15, 29, 2) with a pump intake located at (15, 15, 2). The tile one properties are read into grok and a steady pumping rate is set at -2 m3 s−1.

Figure 5.13: Sample tile drain domain property file prefix.tprops• • •


== Radius ==
Scope: .grok .wprops

TileScreenRadius Tile drain screen radius [L].The radius of the screen interval of the tile drain.

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== Infilled ==
Scope: .grok .wprops
This command should be included in the input file for an infilled tile drain.

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== Hagen Poiseuille ==
Scope: .grok .wprops
This command should be included in the input for the Hagen Poiseuille flow option.

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== Hazen Williams ==
Scope: .grok .wprops
This command should be included in the input file for the Hazen Williams flow option.

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== Manning ==
Scope: .grok .wprops
This command should be included in the input file for the Manning flow option.

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== Friction ==
Scope: .grok .wprops

tile_friction Manning’s friction for tile drains.• • •


== Hazen Williams coefficient ==
Scope: .grok .wprops

tile_hw_coeffient Hazen-Williams coefficient for tile drains.• • •


== Dual nodes for tiles ==
Scope: .grok .wprops
This instruction causes the tile drain flow scheme to use dual node approach.

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== Coupling conductivity ==
Scope: .grok .wprops

TilePropsCplCond Coupling conductivity for tile [L T−1].Coupling conductivity parameter only required for the dual node approach for tile drains.

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== Coupling length ==
Scope: .grok .wprops

TilePropsCplLngth Coupling length for tile drain [L].Coupling length parameter only required for the dual node approach for tile drains.

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