Residents and environmental activists in Ludhiana are protesting the construction of a retaining wall along the Buddha Nullah, alleging it violates National Green Tribunal (NGT) orders. They claim the project narrows the drain's width, disrupts water flow, and poses environmental and safety risks, citing previous NGT directives against permanent construction within the water channel. Concerns also include improper disposal of silt, reducing the water-carrying capacity. An NGT-appointed committee is investigating these allegations.