Muthu ji, this was in Veermata Jijabai Bhosale Udyan (formerly and popularly known as Rani Baug or Victoria Gardens) at Byculla, Mumbai.
The sedge is growing wild in untended area where normally is grass lawn meant for visitors to sit and enjoy the garden.
Moist, we may say, yes ... due to rains, water-logging is obvious in untended grass lawns.
Regards.