Muhammad Sohail Janjua
Pakistan’s major cities experience the same cycle of disruption every monsoon. A few hours of heavy rainfall are enough to inundate roads, submerge underpasses, paralyze traffic, disrupt businesses and overwhelm urban infrastructure. The immediate response usually focuses on pumping water out of the city as quickly as possible. While this remains necessary, it addresses only the symptom rather than the underlying problem.
Urban flooding is no longer simply a drainage issue; it is a consequence of decades of unplanned urbanization. As cities continue to expand, natural soil has been replaced by concrete roads, parking areas, commercial buildings and housing developments. Rainwater that once seeped into the ground now rushes into storm drains within minutes, placing enormous pressure on drainage networks that have limited capacity.
The challenge becomes even greater when disposal stations experience power interruptions during heavy storms. Even a short outage can significantly slow water evacuation, causing underpasses and low-lying areas to fill rapidly. Climate change, characterized by increasingly intense rainfall events, is making these situations more frequent and more severe.
The economic consequences are equally alarming. Floodwater entering commercial areas damages inventories, machinery and infrastructure, forcing businesses to suspend operations and causing substantial financial losses. At the same time, public agencies spend enormous resources every year pumping millions of gallons of rainwater away from cities.
Ironically, the same rainwater that is treated as a nuisance could become one of Pakistan’s most valuable water resources. Groundwater levels in Islamabad, Rawalpindi, Lahore and several other urban centres continue to decline because extraction far exceeds natural recharge. If current trends continue, future generations will face a far more serious water security crisis than urban flooding itself.
Recognizing this challenge, the Lahore Development Authority (LDA) and the Water and Sanitation Agency (WASA), following directions from the Lahore High Court, have constructed underground rainwater storage facilities at several strategic locations, including Bagh-e-Jinnah, Sheranwala Gate, Kashmir Road, and 17 other sensitive locations which used to undergo ponding during rainy season in the past. These projects demonstrate that temporary storage can significantly reduce surface flooding during peak rainfall.But this arrangement is insufficient so far.
The Capital Development Authority (CDA) Islamabad has emerged as a national leader in sustainable urban water management by making rooftop rainwater harvesting, storage tanks and groundwater recharge wells mandatory under its building regulations, while simultaneously developing city-wide recharge wells and underground storage facilities to reduce urban flooding and replenish groundwater aquifers. Such regulatory initiatives acknowledge that rainwater should be managed at its source instead of relying exclusively on downstream drainage infrastructure.
We should now adopt a broader policy by integrating rainwater harvesting into urban planning and building regulations. Residential plots of one kanal and above provide sufficient open space to build groundwater recharge wells safely without affecting building foundations. Public parks and green belts within housing societies should also incorporate larger recharge structures capable of receiving excess stormwater from surrounding neighbourhoods.
The engineering concept behind a household recharge well is remarkably simple and affordable. Constructed at a safe distance from the building’s foundations, the well consists of an excavated pit filled with layers of coarse stones, gravel, crushed bricks and sand that act as natural filtration media. Rainwater collected from rooftops and paved surfaces passes through a basic filter before entering the recharge well, where it gradually infiltrates the underlying aquifer. The system requires no pumps, consumes no electricity and demands only periodic maintenance to remove accumulated sediments.
Far from being experimental, this approach has become standard practice in many developed countries. Singapore has incorporated rainwater management into its national water strategy, while Japan uses rainwater storage and infiltration systems in urban developments to reduce flooding. Australia actively promotes household rainwater harvesting through planning regulations and incentives, and many cities in Germany and the United States have integrated infiltration systems into sustainable urban drainage policies. These experiences demonstrate that managing rainwater at the source is often more economical than continuously expanding drainage infrastructure.
However, legislation alone will not be sufficient. Development authorities should publish standardized designs, engineering specifications and construction guidelines for recharge wells. Technical assistance should be made available to homeowners, builders and housing societies, while incentives such as rebates on property tax or water charges could encourage wider public participation. Monitoring groundwater levels through simple observation wells would also enable policymakers to measure the effectiveness of these initiatives over time.
Pakistan cannot continue treating rainwater solely as waste to be discharged into drains. Every monsoon reminds us that urban flooding and groundwater depletion are two sides of the same challenge. By transforming rainwater from a liability into a resource, cities can simultaneously reduce flood risks, strengthen water security and build greater resilience against climate change. The solution does not lie only in bigger drains and more powerful pumps. It lies in allowing every possible drop of rain to return to the ground where it naturally belongs.
—The writer is a former Director Public Relations. He has served LDA and Irrigation Department. He writes on civic issues.
