In a move to improve urban infrastructure, the Delhi government has started using a new construction method to upgrade its stormwater drainage network across the city.
Under this initiative, authorities are replacing the traditional cast in-situ technique with precast drain boxes. This step is part of a larger citywide drain remodelling programme aligned with the drainage master plan. “Around 20 tenders have been issued so far with work under way in Shalimar Bagh. The project will be expanded to other areas in a phased manner,” said PWD minister Parvesh Verma.
The precast method involves manufacturing drain components in factories under controlled conditions and then installing them on-site. In contrast, the in-situ method requires mixing and pouring materials like cement and sand directly at the construction location.
Officials said this shift will improve quality, speed up execution, and reduce pollution. “Since the components are made off-site, installation is quicker and causes less disruption to traffic and daily life,” Verma said.
Another key advantage is durability. Precast drains come with an estimated 50-year lifespan, making them more reliable than traditional systems. The method also helps reduce dust and air pollution, especially in densely populated areas. “We are focusing on construction methods that are efficient, long-lasting and less intrusive. Precast systems allow us to maintain quality standards while also reducing environmental impact,” he added.
However, officials clarified that the Delhi will follow a hybrid approach. Precast boxes will be used in straight sections, while the in-situ method will continue in areas with curves or complex layouts. “The precast system is ideal for straight sections where installation is relatively simple. For bends and irregular layouts, the flexibility of in-situ construction is still required to ensure proper connectivity,” an official said.
The new method also reduces excavation time. Traditional construction often leaves roads dug up for several days due to curing requirements. In comparison, precast components can be installed quickly, minimising roadblocks and public inconvenience.
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