A covered drain paved with stones and topped with an arch lined with
thin, burnt clay bricks was discovered by members of the Archaeological
Survey of India at the Red Fort, a fortress built of red sandstone by
Mughal emperor Shah Jahan in 1639 CE. You might know him as the builder
of the Taj Mahal.
The drain once connected the fort’s Delhi
Gate to the moat which surrounded nd protected the fort. Researchers are
now removing silt from the drain, and then will strengthen it, so that
it will once again be able to serve as a channel for rainwater.
Rainwater from within the Red Fort seems to have been directed to the
moat, whereas rainwater collected from the surrounding city was drained