Delhi Upgrades Stormwater System with New Precast Drain Technology

  • April 14, 2026, 11:40 a.m.

New Delhi: In a major infrastructure reform aimed at addressing chronic monsoon waterlogging, the Delhi government has adopted precast Reinforced Cement Concrete (RCC) technology for construction and upgrading of stormwater drains across the city.

According to officials from the Public Works Department (PWD), the new method marks a shift from the traditional cast-in-situ drainage system to factory-made precast drain structures that are installed on-site.

The initiative is part of the broader Drainage Master Plan 2025, which aims to modernise Delhi’s drainage network and improve stormwater management capacity ahead of increasingly intense monsoon seasons.


 What is the new precast drainage system?

Under the new system:

  • Drain components are manufactured in controlled factory conditions
  • These RCC structures are then transported and assembled at construction sites
  • Only foundation and joint work is done on-site

Officials said the system ensures:

  • Faster construction timelines
  • Higher durability (up to ~50 years life span)
  • Better quality control and uniform structure
  • Reduced road digging and traffic disruption

PWD officials noted that precast drains are being used mainly on straight road stretches, while traditional methods will continue in curved sections where precast fitting is not feasible.


 Why the change was needed

Delhi has long faced:

  • Severe monsoon waterlogging
  • Overflowing storm drains
  • Traffic disruption due to prolonged construction work
  • Weak and aging drainage infrastructure

Officials said the earlier cast-in-situ method often required road digging and extended construction time, leading to congestion and pollution in densely populated areas.


 Where work is underway

The precast drainage system is being implemented in several key areas, including:

  • Rohini
  • Sultanpuri
  • Nangloi Road
  • Azadpur–Camp Chowk corridor
  • Chhoturam Marg
  • Gyan Shakti Mandir Marg
  • Maharaja Agrasen Marg

These locations are among Delhi’s identified waterlogging hotspots.


 Project scale and related upgrades

  • Delhi has about 2,152 km of drain network under PWD control
  • Around 77 waterlogging hotspots have been identified for urgent upgrades
  • Multiple drainage remodelling projects are already underway under the master plan
  • Government has also been clearing large-scale silt from drains ahead of monsoon preparedness

Officials earlier stated that over 14 lakh metric tonnes of silt had been removed, with a target of 28 lakh metric tonnes before monsoon season.


 Key benefits of the new system

The precast technology is expected to:

  • Reduce construction time significantly
  • Improve stormwater flow capacity
  • Lower risk of urban flooding
  • Minimise dust, road damage, and traffic jams
  • Increase lifespan of drainage infrastructure

Officials said the system will help ensure faster execution of drainage projects before the monsoon season, improving preparedness for extreme rainfall events.


 Government’s long-term plan

The initiative is part of Delhi’s long-term Drainage Master Plan 2025, which aims to:

  • Create a modern, city-wide stormwater management system
  • Upgrade trunk drains and secondary networks
  • Integrate flood-control mechanisms
  • Reduce recurring waterlogging in low-lying areas

Officials said the plan is designed to meet the city’s drainage needs for the next 25–30 years.

Author : Rajdhani Delhi Representative

Rajdhani delhi representative

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