Water plays many important roles in Islam. In order to pray, enter a masjid, or hold a Quran, a believer must first perform a ritual cleansing called wudu. For convenience, Islamic holy sites, like Nizam al-Din's Chilla Khana & Khanqah have ablution tanks on site for use by those that intend to enter.
Some mosques, such as the Jami Masjid in Old Delhi, were designed with central ablution tanks that are sometimes called fawwara.1
1. Philip Davies The Penguin Guide to the Monuments of India. Vol. 2: Islamic, Rajput, European (London: Penguin books, 1989), 595.
O you who have believed, when you rise to [perform] prayer, wash your faces and your forearms to the elbows and wipe over your heads and wash your feet to the ankles. And if you are in a state of janabah, then purify yourselves. But if you are ill or on a journey or one of you comes from the place of relieving himself or you have contacted women and do not find water, then seek clean earth and wipe over your faces and hands with it. Allah does not intend to make difficulty for you, but He intends to purify you and complete His favor upon you that you may be grateful.
— Al-Ma'ida, Quran, Surah 5, Ayah 6
Sufi photographer and journalist, Manyank Soofi uses his talents to capture the essence of the Nizamuddin neighborhood.
Ali, Asif. "Mosque Architecture in Delhi: Continuity and Change in its Morphology" Ateet. Special Issue, 40-57.