Abstract:
Thumbikulama tank in the Bellankadawala cascade in the dry zone of Sri
Lanka is among the most degraded, resulting in many social and environmental is-
sues. Poor resilience to flood and drought conditions, alteration of natural ecosystem
structure and function, and human-elephant conflicts are the key issues that arose due
to the degradation of the Thumbikulama tank. However, considering its potential to
facilitate crop production in the command area, rehabilitation of Thumbikulama tank
is timely essential. The aim of this study was to examine a suitable strategy for the
sustainable rehabilitation of Thumbikulama tank. Primary data were collected from
120 farmers from each Grama Niladhari divisions: Demunnewa, Vayaulpotha, and
Bellankadawala through a questionnaire survey and focus group discussions with ran-
domly selected 30 key persons. Data were qualitatively analyzed through participa-
tory need analysis, SWOT, and thematic analysis methods. This study identified sus-
tainable maintenance and operation (90%), physical and ecological rehabilitation
(88%), development of infrastructure and other agricultural activities (62%), cascade-
based interventions (60%), and institutional development (35%) as key areas of the
development strategy. Results show that sustainable maintenance and operation are
essential for the tank's sustainable management. Participatory forest management,
land consolidation, development policy and regulations, and routing maintenance ar-
rangements are identified as the key actions to be taken to maintain forest tanks for
an extended period and ensure the system's sustainability
