Green walls are typically irrigated using recirculating irrigation systems.
This means that water, often enriched with nutrients, is pumped from a reservoir or tank to the top of the green wall. From there, it's distributed evenly across the planting medium, whether it's soil, felt, or another substrate, ensuring all plants receive adequate moisture. Gravity then pulls the excess water downwards, where it is collected at the bottom of the wall and returned to the tank. This closed-loop system significantly reduces water waste and ensures efficient resource utilization.
Here's a breakdown of the process:
- Reservoir: A tank holds the water and, often, a nutrient solution.
- Pump: A submersible pump circulates the water.
- Distribution System: This can include drip lines, spray nozzles, or a wicking system that evenly distributes water across the wall.
- Growing Medium: The type of material used impacts irrigation efficiency. Some mediums retain more water than others.
- Collection System: At the base of the wall, water is collected and filtered before being returned to the reservoir.
The frequency and duration of irrigation cycles are typically controlled by a timer or sensors that monitor moisture levels within the growing medium. This ensures that the plants receive the right amount of water without overwatering or underwatering them. This controlled system minimizes water waste and optimizes plant health.
