Abstract
Water-absorbing roads, technically known as permeable pavement systems, are an innovative and sustainable approach to urban stormwater management. These roads are designed to allow rainwater to pass through a porous surface or permeable joints into the underlying pavement layers, where it is temporarily stored and gradually infiltrated into the soil or discharged through an underdrain system. This project presents a literature-supported conceptual study of permeable pavement systems, focusing on their design, working principles, materials, applications, advantages, and limitations.
The study examines three major types of permeable pavements: porous asphalt, pervious concrete, and permeable interlocking concrete pavement (PICP). It explains the functions of different pavement layers, including the permeable surface, bedding layer, aggregate reservoir, subgrade, and drainage system. The project also discusses important engineering factors such as rainfall intensity, soil permeability, groundwater level, traffic loading, clogging, maintenance, and construction quality.
Permeable pavement systems have the potential to reduce surface runoff, minimise waterlogging, provide temporary rainwater storage, and contribute to groundwater recharge under suitable site conditions. They can also complement conventional drainage systems and support sustainable urban development, particularly in Indian cities experiencing heavy monsoon rainfall. However, their effectiveness depends on proper site investigation, hydraulic and structural design, regular maintenance, and safe overflow arrangements during extreme rainfall events.