I had gone through this project in detail last year. Its scale and implementation was truly massive and the H shaped green roof which has 4 massive rainwater collection ponds at the base is very impressive and practical.
The urban farm on the green roof generates around 20 tons of organic produce in a year. This is what a green roof can truly offer, a multidimensional usage of the same space with various layers of benefits added on.
For more on this project visit:
https://www.greenroofs.com/2021/02/16/featured-project-thammasat-university-urban-rooftop-farm-turf/
This has to be one of the most impressive green roofs ever constructed. The total cost of this project was US$ 31 million and the size of the green roof is 1.7 acres.
A splendid undertaking.
Harihara