ໃນລະດູແລ້ງແຕ່ລະປີ, ອາຣິຍະທຳຄວາມຈະເລີນຮຸ່ງເຮືອງວັດທະນະທຳສະຖາປັດຕິມາກຳ ໄດ້ຜຸດຂື້ນໃຫ້ມວນຊົນໄດ້ຮູ້ໄດ້ເຫັນໄດ້ສຳພັດ ພາຍໃນອ່າງເກັບນໍ້າໂກຕະມາລາ, ໂຄງການພັດທະນາມະກາເວລີ ຖ້ວມເນື້ອທີ່ການຜະລິດກວ່າ 2,270 ເຮັກຕາ 57 ໝູ່ບ້ານ ແລະ 54 ວັດ ປະເທດ ສີລັງກາ.
Kothamale Reservoir was the first project to begin under the Mahaweli Development Project which 2,270 ha of fertile land of the Kotmale Valley. Submerged by the waters of the reservoir are the ruins of many temples and human settlements.
In fact, more than 14 tea estates, 57 villages and about 54 ancient temples, among others are said to have gone under water when the reservoir was built. While many of these places do not exist at present, even underwater, some of them still do.
Among these, the ruins of the Kadadora Viharaya are spectacular, especially the sculptured statues of the Buddha and other deities. The name of this temple has been lost in time after the reservoir was built, but it is believed to be Pratibimbarama Viharaya of Kadadora.