Become a 'Sponge City'
The 'Sponge City' concept is gaining traction as a way to combat urban water woes. Instead of letting precious rainwater wash away into overburdened drains, this approach uses nature-based solutions to absorb, store, and slowly release it. Think permeable
pavements instead of concrete, and more green spaces like parks, rain gardens, and wetlands integrated into the urban fabric. These 'sponges' not only help recharge groundwater but also reduce the risk of urban flooding, a common problem during heavy monsoon spells. By mimicking natural landscapes, cities can turn rainfall from a hazard into a resource.
Mandate Widespread Rainwater Harvesting
Rainwater harvesting (RWH) is one of the most effective decentralised solutions. While many states like Tamil Nadu, Maharashtra, and Karnataka have made RWH systems mandatory for new buildings, consistent enforcement is key. The strategy involves more than just rooftop collection systems for individual homes. It requires a city-wide plan that includes directing runoff from flyovers, parks, and open spaces into recharge pits, shafts, and percolation tanks. These structures help channel water back into the ground to replenish depleted aquifers, which a majority of cities depend on. Campaigns like Bengaluru's 'Million Recharge Wells' show the potential of community-driven efforts to augment groundwater levels.
Treat and Reuse Every Drop of Wastewater
Treating used water as a resource, not waste, is a crucial paradigm shift for urban India. According to NITI Aayog, about 600 million Indians face high water stress, yet only a fraction of urban wastewater is currently treated. Under initiatives like the Swachh Bharat Mission-Urban 2.0, cities are being pushed to build and upgrade Sewage Treatment Plants (STPs). The goal is to create a circular economy where treated wastewater can be reused for non-potable purposes like industry, agriculture, cleaning, and rejuvenating lakes. Cities like Surat, Jaipur, and Navi Mumbai are already demonstrating how treated water can reduce the strain on fresh water sources. Decentralised treatment systems can also play a role, treating water closer to where it is generated and used.
Fix the Leaks and Modernise Infrastructure
Indian cities lose an astonishing amount of water—estimated between 30% to 50%—before it even reaches the consumer due to leaky pipes, theft, and inefficient distribution networks. This 'Non-Revenue Water' (NRW) represents a massive, correctable failure in the system. Plugging these leaks through systematic audits and infrastructure upgrades is a critical, though often overlooked, step. Modernising the water grid not only saves colossal amounts of water but also improves the reliability of supply and reduces the chances of contamination that occurs when old, broken pipes allow pollutants to seep in. AMRUT 2.0, a central government mission, focuses on helping cities become 'water secure' by reducing such losses.
Recharge and Protect Groundwater
Many of India's biggest cities, including Delhi, Bengaluru, and Hyderabad, are at risk of running out of groundwater due to over-extraction. Protecting and actively recharging these underground aquifers is non-negotiable. Artificial recharge involves techniques that direct surface water from monsoons into the ground. This can be done using check dams, percolation tanks, and injection wells. The Master Plan for Artificial Recharge to Groundwater-2020 promotes specific techniques based on a region's terrain and water availability. Equally important is protecting existing recharge zones, like urban lakes and wetlands, from encroachment and pollution, as these natural bodies are vital for maintaining the water table.
