The Hydraulic Performance of the Green Roofs by Using Banana Trunk Waste as the Material Layer

Abstract

Urbanization has increased the incidence of floods due to impermeable surfaces that prevent rainwater absorption, underscoring the necessity for effective stormwater management. Using green roofs, which include growth and other material layers, is an alternative solution. This research evaluates the hydraulic performance of green roofs incorporating banana trunk waste, a highly effective material due to its water absorption and retention properties in a drainage and filter layer, with the added support of PET bottle caps for lightweight structural applications. The study looks at the fibre model’s peak flow reduction ranging from 61% to 77% and retention rate ranging from 64.75% to 79.47%, with the rainfall simulation carried out in low, moderate, and severe intensities, which are 10 mm/h, 30 mm/h, 60 mm/h, 180 mm/h, 350 mm/h and 550 mm/h. The research highlights the effectiveness of banana trunk waste and recycled materials, such as PET bottle caps, in enhancing the performance of green roofs to address waste disposal issues, while promoting circular economy systems.