Securing Urban Futures: The Critical Importance of River Health Evidence from the Najafgarh Sub-Basin, NCT of Delhi

Abstract

Half the planet now lives in cities, and the rivers running through those cities are paying for that growth in measurable ways. He and colleagues (2021) place the urban population already facing water scarcity at roughly 933 million as of 2016, with projections climbing to anywhere between 1.69 and 2.37 billion by mid-century. India bears the heaviest share of that projected rise. In Delhi, the case has tipped well past warning. A 22-kilometre stretch of the Yamuna inside the city limits—barely two per cent of the river's full length—now carries between 76 and 80 per cent of its pollution burden (Central Pollution Control Board [CPCB], 2022), with two drains, Najafgarh and Shahdara, accounting for about 84 per cent of what the city contributes (Delhi Pollution Control Committee [DPCC], 2020). This paper builds on a thematic review of 252 peer-reviewed studies, the Delphi-validated parameter set developed for the Najafgarh sub-basin, and supplementary online evidence to argue that securing urban futures depends on one specific kind of planning instrument: an instrument capable of turning measurable land-use pressure into a binding regulatory outcome at the planning-cell scale. To operationalise that argument, I propose a framework anchored to the Driver–Pressure–State–Impact–Response logic (Lalande et al., 2014), consisting of a hydrological-pressure index keyed to land-use composition, a five-domain river-health index calibrated to CPCB norms, and a composite index that translates the two together into one of four binding action classes. Each class is mapped to a defined bundle of levers under the Master Plan of Delhi and the Unified Building Bye-Laws. Three obstacles to delivery stand out from the analysis: institutional fragmentation across overlapping agencies, the absence of a basin-scale unit in the planning regime, and the continued dominance of static zoning over adaptive regulation. Without addressing these, India's commitments under Sustainable Development Goal 6 (specifically Targets 6.3, 6.5, and 6.6) will remain out of reach, and its urban futures structurally exposed.