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The study aims to evaluate a novel drainage system's effectiveness for green roofs and other nature-based solutions.

February 28, 2026Applied SciencesOpen Access

Hydraulic Performance and Capillary Irrigation Feasibility of a Novel Drainage System for Green Roofs

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Experimental validation reveals improved stormwater retention and passive irrigation in green roofs, suggesting enhanced urban resilience.

The study aims to evaluate a novel drainage system's effectiveness for green roofs and other nature-based solutions.
Experimental validation using a double-layer drainage system.
Infiltration tests to measure hydraulic conductivity.
Capillary rise experiments to assess irrigation feasibility.
Laboratory-scale testing (25 × 25 cm) as proof of concept.
Infiltration rates ranged from 0.01 mm/min to 20 mm/min based on filter material.
Integrated system showed infiltration rates of 0.8–2.0 mm/min.
Maximum vertical and horizontal capillary rise of 32 cm and 39 cm, respectively.
The system enables passive subsurface irrigation using stored runoff effectively.

Pirouz et al. (2026) studied this question.

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Experimental validation reveals improved stormwater retention and passive irrigation in green roofs, suggesting enhanced urban resilience.