To enter the Taj Mahal, the Mosque on the west side, or the Guest House which mirrors the Mosque on the east side, visitors need to take off shoes. After the visit, many girls would wash their feet in this pool. From what I can see, this pool is the only major public water source in the Taj Mahal complex. All other pools were dry. Maybe the water was there because of the cleaning project carried out at the time.
(7 Sep 2002, 70mm, F2.8 A-mode)