A river becomes part of the city when it flows through it. Yamuna flows through Delhi and it very much belongs to Delhi and Delhi belongs to Yamuna. Despite that it is so unclean. The condition of river is reflective of the political leadership. Look at Sabarmati in Ahmedabad. How it was cleaned and how was the leadership there who got it cleaned. In Delhi no one wants to clean the Yamuna because it is a business for them, a way to make money by asking for various funds.