Question

why mughal,lay garden based on chahar bagh format

Answer 1

for eazy watering and it's their dynastystyle of archetic

Answer 2

Charbagh or Chahar Bagh (Persian-Urdu: چهارباغ chāhār bāgh, meaning "four gardens") is a Persian quadrilateral garden layout based on the four gardens of Paradise mentioned in the Qur'an. It is also a part of the Indo-Persian culture and Islamic gardens. The quadrilateral garden is divided by walkways or flowing water into four smaller parts.[1] They are found in countries throughout Western Asia and South Asia, including Iran and India.[2]