Morocco is trialing a permeable pavement system that absorbs water and cools itself through evaporation, with tests underway in parts of Marrakech and Agadir. The approach seeks to replace conventional black asphalt, which absorbs solar energy and later releases it as heat, contributing to urban heat islands. In an Arizona study referenced by the U.S. Environmental Protection Agency, standard pavement reached around 152°F at midday, while cooler surfaces stayed 10°F to 16°F lower. The new material allows rainwater to pass into a stone base and, where possible, into the ground. Stored moisture can then evaporate, using heat in the process similar to perspiration. This may lower surface temperatures and reduce runoff during storms. Reports indicate the experiments are limited to selected urban spots rather than a full replacement of asphalt. Benefits include less spray on roads, better traction, and potentially lower air-conditioning demand in nearby vehicles. However, performance depends on moisture levels, and dry conditions can reduce cooling. Permeable surfaces also require regular maintenance to avoid clogging from sediment or debris. The trials align with Morocco’s Marrakech Sustainable City program, launched in 2023, which involves government ministries, local authorities, the United Nations Development Programme, and the Global Environment Facility. The initiative has $9.5 million in funding and targets improvements in climate resilience, mobility, and energy efficiency for over one million residents. Applications focus mainly on sidewalks, parking areas, and lightly used streets rather than major highways.
