Design and evaluation of a low-cost permeable pavement system for urban settlements under monsoon rainfall

Project Abstract

The study presents the design, evaluation, and performance assessment of a low-cost permeable pavement system intended for urban settlements subjected to intense monsoon rainfall. The research addresses rising urban floods and pollution due to inadequate stormwater management by proposing a modular, locally sourced permeable pavement solution that balances hydraulic efficiency, structural safety, and cost-effectiveness. The abstract outlines a multi-phase methodology beginning with material characterization of locally available aggregates, geotextiles, and porous asphalt mixtures to determine optimal porosity, infiltration rate, strength, and durability under cyclic wetting and drying. A pilot-scale roadway test section was constructed to simulate typical urban loads, vehicle traffic patterns, and variable rainfall intensities representative of monsoon seasons. Hydrologic modeling using continuous simulation was coupled with on-site advanced monitoring to quantify peak runoff reduction, rainfall–infiltration response, and groundwater recharge potential. In parallel, a life-cycle cost analysis and a preliminary life-cycle assessment were performed to compare the permeable pavement against conventional rigid and porous asphalt alternatives, emphasizing maintenance regimes, clogging potential, and long-term environmental impacts. Laboratory and field tests evaluated key performance indicators including infiltration rate stability, pore void integrity, clogging propensity from sediment and organic matter, frost resistance if applicable, skid resistance, and surface macrotexture under repeated wetting. A numerical model was calibrated to reproduce observed infiltration and runoff patterns, enabling scenario analysis for different monsoon intensities, rainfall durations, and sediment loads. The results demonstrate that the proposed low-cost system achieves substantial reductions in surface runoff peak and total runoff volume, with infiltration rates remaining above minimum thresholds after partial clogging scenarios typical of urban sedimentation. The structural query indicates adequate load-bearing capacity for light to moderate traffic when designed with appropriate layer thicknesses and geocomposite reinforcement, while maintenance strategies such as periodic vacuuming and scheduled flushing preserve hydraulic performance and extend service life. The study also identifies trade-offs between porosity and structural strength, highlighting the importance of material selection, compaction, and drainage geometry in achieving resilient performance under monsoon cycles. Sensitivity analyses reveal that local climate variability, land-use patterns, and maintenance frequency are critical drivers of long-term performance and life-cycle costs. The work concludes that a carefully designed low-cost permeable pavement system can offer an effective, adaptable, and scalable solution for flood-prone urban areas, enabling safer transportation, improved water quality, and enhanced urban resilience. Recommendations include guidelines for material procurement, construction practices, maintenance protocols, and modular design options to facilitate replication in similar climatic regions, along with policy implications for urban drainage planning and climate adaptation strategies.

Project Overview

What This Project Is About

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A plain-language overview of permeable pavement and how a low-cost version can help urban areas cope with heavy rain, flooding, and runoff in monsoon climates. The project compares simple materials and designs to reduce cost while maintaining drainage and long-term performance.

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The Problem It Addresses

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Urban streets and sidewalks in monsoon regions often flood because rain cannot soak into the ground quickly enough and surface runoff carries pollutants. Many affordable paving options fail early or require expensive maintenance. This project looks at a budget-friendly pavement system that allows water to pass through while supporting traffic.

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Objectives of the Project

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1. Identify a low-cost permeable pavement design suitable for small to medium urban roads.
2. Evaluate material choices that balance cost, strength, and drainage.
3. Assess flood reduction potential and water management benefits.
4. Analyze maintenance needs and lifecycle costs compared with traditional pavements.
5. Provide practical guidelines for implementation in underserved areas.

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What You Will Do Step by Step

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1) Review simple permeable pavement concepts and select a feasible design. 2) Gather data on material costs, drainage rates, and traffic tolerance. 3) Build a small test section or use a simulated model to compare performance. 4) Run simple tests for infiltration, strength, and durability. 5) Analyze results and estimate lifecycle costs. 6) Develop practical construction suggestions and maintenance plans. 7) Write up findings with clear recommendations.

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Expected Outcome

An affordable, easy-to-construct permeable pavement option that shows promising drainage and cost benefits, plus practical guidelines for adoption in monsoon-affected cities. The project should produce design notes, performance indicators, and a simple maintenance plan.