The Business Bytes
BHUBANESWAR, JULY 8, 2024 (TBB BUREAU): India’s rapid urbanization has spurred the widespread construction of impermeable pavements such as bituminous and concrete surfaces. These surfaces exacerbate stormwater runoff during rainfall, leading to flood-like conditions in many cities. Moreover, the increase in impermeable surfaces coupled with urban population growth has significantly depleted groundwater reserves, impacting urban residents’ quality of life. Recognizing that urban areas such as parking lots, cycle tracks, and pedestrian walkways do not necessitate impermeable pavements due to light traffic, researchers at the Indian Institute of Technology (IIT) Bhubaneswar have developed a solution: Pervious concrete pavements. This innovation aims to mitigate stormwater runoff and promote groundwater recharge.
Pervious concrete pavements offer a novel solution to these challenges. Unlike traditional pavements, pervious concrete features interconnected voids with at least 15 percent porosity, allowing stormwater to infiltrate through the pavement and recharge the groundwater. This reduces runoff, mitigates urban flooding, and is particularly suitable for areas such as parking lots, cycle tracks, and pedestrian walkways.
Recently, the School of Infrastructure at IIT Bhubaneswar implemented pervious concrete pavements in the cycle parking area, covering 150 square metres with 18 slabs. Students from the Transportation Engineering Section participated by installing 150 mm thick pervious concrete slabs measuring 3.5 by 2.5 metres, placed over a 250–300 mm reservoir layer atop the subgrade. The system can store over 20 cubic metres of water without runoff. Pervious concrete, produced at a ready-mix concrete (RMC) plant, facilitates stormwater infiltration, promoting percolation into the subgrade and aiding groundwater recharge.
To assess the efficiency of pervious concrete pavements, rainfall data from June 27, 2024, was analyzed by the GMAG lab of the School of Earth, Ocean, and Climate Sciences. The pavement successfully infiltrated 6.8 cubic metres of stormwater per hour during a rainfall intensity of 47.24 mm/hr from 1:30 pm to 4 pm without generating any runoff.
Anush K Chandrappa, a faculty member from the School of Infrastructure, along with his students, conducted extensive research on the benefits of pervious concrete pavements. Their findings demonstrate that these pavements not only reduce runoff but also mitigate urban heat island (UHI) effects due to their increased porosity and latent heat flux. During the summer season at IIT Bhubaneswar, the surface temperature of bituminous pavement was approximately 20°C higher than that of pervious concrete pavement, significantly contributing to the urban heat island phenomenon. The project received extensive support from Prof. Sumanta Haldar, Head of the School of Infrastructure.
The implementation of pervious concrete pavements at IIT Bhubaneswar, supported by the engineering section of the institute, underscores the institution’s commitment to sustainable infrastructure and sets a precedent for urban areas to follow. By reducing stormwater runoff and promoting groundwater recharge, this innovative approach addresses critical urban environmental issues and enhances the quality of life for city dwellers.
