Formation of the "Sandwich":
Geotextile is laid on the bottom and walls of the trench - a high-strength filter material that allows water to pass through, but retains soil particles, preventing siltation.
A cushion of crushed stone (fraction 20-40 mm) is poured.
Drains are laid - modern corrugated pipes with perforation, already wrapped in geotextile.
The pipes are completely covered with crushed stone.
The "sandwich" is securely wrapped in the edges of the geotextile and covered with sand, and then with soil.
https://drenazh-nauchastke.ru/drenazh-fundamenta
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