Presentation and sizing of basins

Pond with vertical flow filter
 Dimension:
- Shape: rectangular
- Surface area: 1.8 m2
- Slope: Minimum slope of land is 5% and in the direction of effluent flow (downward slope) to ensure gravity flow
- Depth: 80 cm
 Drainage
Water drainage is provided by a collection pipe at the bottom of the bed. The collection pipe is perforated and placed with the slots facing down. The water is collected in this pipe and then directed to the horizontal filter.
 Ventilation
Two ventilation chimneys are placed vertically in the substrate by connecting the collection pipe to the bottom of the bed on the surface. They allow to ventilate the bottom of the substrate.

Pond with horizontal flow filter
 Dimension:
- Shape: rectangular
- Surface area: 1.8 m2
- Slope: Minimum slope of land is 5% and in the direction of effluent flow (downward slope) to ensure gravity flow
- Depth: 80 cm

Lagoonary pond
 Dimension:
- Form: Irregular, imitation of natural systems existing on the site
- Area: 1.5 m2
- Slope: Minimum slope of land is 5% and in the direction of effluent flow (downward slope) to ensure gravity flow
- Depth: 0.5 cm