River Yamuna enters Delhi at its northern border with the state of Haryana. The location of entry is known as Palla. The river flows 48 kilometres in Delhi before leaving from the southern border at Okhla barrage. First 26 km of river’s flow in the city-state are unobstructed, free from pollution too. Wazirabad barrage is the first obstruction to flow of the river in the city, it is also a major catchment for municipal supply within the city. Further 22 km flow of Yamuna in Delhi is impeded by urban activities including extensive bridging of the flood plain, discharge of treated and untreated sewerage flows.
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