In a septic drainage field, which drainage tile is laid in trenches, filled with gravel?

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Multiple Choice

In a septic drainage field, which drainage tile is laid in trenches, filled with gravel?

Explanation:
Drainage tiles in a septic drain field must collect groundwater from the surrounding soil and move it away through the pipe, while allowing moisture to enter the pipe from the trench. Perforated drainage tile has holes along its length, so water can seep into the pipe from the gravel-filled trench and be carried away. The gravel layer provides filtration and a path for water to reach the pipe evenly. A solid pipe wouldn’t let water enter, which defeats the purpose of draining the trench. That’s why perforated drainage tile is used in this setup.

Drainage tiles in a septic drain field must collect groundwater from the surrounding soil and move it away through the pipe, while allowing moisture to enter the pipe from the trench. Perforated drainage tile has holes along its length, so water can seep into the pipe from the gravel-filled trench and be carried away. The gravel layer provides filtration and a path for water to reach the pipe evenly. A solid pipe wouldn’t let water enter, which defeats the purpose of draining the trench. That’s why perforated drainage tile is used in this setup.

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