The catchment area is vital to maintain the water levels of the five tanks in the down stream of Kirindi Oya and wetland characteristics of Bundala National Park.

[3] Lunugamvehera is in the Dry zone of Sri Lanka, therefore the park is exposed to annual drought,[2] relieved by the south western monsoon.

[1] Some of the plant species of the forest are Drypetes sepiaria, Manilkara hexandra, Schleichera oleosa, Lannea coromandelica, Diospyros ovalifolia, Polyalthia korinti, Carmona microphylla, Croton lacciterus, and Coffea wightiana.

Chloris montana, Cynodon dactylon, Panicum maximum, Imperata cylindrica, Lantana camara, Chromolaena odorata, Mimosa pudica, Carmona microphylla, and Securinega leucopyrus are common in abandoned chena lands.

Large water birds such as grey heron, black-headed ibis, Asian openbill, painted stork, and spot-billed pelican live here.