Shower of Gold!
"Senna Siamea" (closest species match)
Common Name : Siam Cassia
Origin : Malaya
Flowering Season : Most part of the year
Vernacular Name : Seeme Tangdi
Brief Description : This species is planted as an ornamental and well suited for gardens and parks as it is not a very large tree. The yellow flowers and pods are borne in clusters. Pods are flat and occur simultaneously with the flowers. Parakeets can be seen feeding on the seeds by evicting them from the flat pods. It does very well even in hot, arid conditions and hence of great use in afforesting hot arid areas. This fast growing, evergreen species can be propagated from seed. The larvae of the Emigrant butterfly Catopsilia sp. feed on the leaves of this species.
P.S. - I found the above written details on the flower and its tree, online.
There are three similar looking species of this flower, and the flower species in the picture may be "Cassia Spectabilis", but I'm not sure.
''Senna siamea'' , also known as Kassod Tree, Cassod Tree and as Cassia tree, is a legume in the subfamily Caesalpinioideae. It is native to South and Southeast Asia, although its exact origin is unknown.
It is a medium-size, evergreen tree growing up to 18 m with beautiful yellow flowers. It is often used as shade tree in cocoa, coffee and tea plantations. In Thailand it is the provincial tree of Chaiyaphum Province and some places in the country are named after it.