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.


 * &bull; &bull; &bull;

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


 * &bull; &bull; &bull;

Radius
Scope: .grok .wprops
 * 1) TileScreenRadius Tile drain screen radius [L].

The radius of the screen interval of the tile drain.
 * &bull; &bull; &bull;

Infilled
Scope: .grok .wprops

This command should be included in the input file for an infilled tile drain.
 * &bull; &bull; &bull;

Hagen Poiseuille
Scope: .grok .wprops

This command should be included in the input for the Hagen Poiseuille flow option.
 * &bull; &bull; &bull;

Hazen Williams
Scope: .grok .wprops

This command should be included in the input file for the Hazen Williams flow option.
 * &bull; &bull; &bull;

Manning
Scope: .grok .wprops

This command should be included in the input file for the Manning flow option.
 * &bull; &bull; &bull;

Friction
<tt>Scope: .grok .wprops</tt>
 * 1) tile_friction Manning’s friction for tile drains.
 * &bull; &bull; &bull;

Hazen Williams coefficient
<tt>Scope: .grok .wprops</tt>
 * 1) tile_hw_coeffient Hazen-Williams coefficient for tile drains.
 * &bull; &bull; &bull;

Dual nodes for tiles
<tt>Scope: .grok .wprops</tt>

This instruction causes the tile drain flow scheme to use dual node approach.
 * &bull; &bull; &bull;

Coupling conductivity
<tt>Scope: .grok .wprops</tt>
 * 1) TilePropsCplCond Coupling conductivity for tile [L T−1].

Coupling conductivity parameter only required for the dual node approach for tile drains.
 * &bull; &bull; &bull;

Coupling length
<tt>Scope: .grok .wprops</tt>
 * 1) TilePropsCplLngth Coupling length for tile drain [L].

Coupling length parameter only required for the dual node approach for tile drains.
 * &bull; &bull; &bull;