Adaptation to climate variability in Sri Lanka: a case study of the Huruluwewa Irrigation System in the Dry Zone

arid zones case studies catchment areas climate change adaptation climate variability crop production crop water use cropping patterns diversification drought farm income farmers geographical information systems groundwater recharge irrigation canals irrigation efficiency irrigation management irrigation systems land use rainfall patterns remote sensing reservoirs resilience risk seasonal cropping water accounting water availability water depletion water management water policies water productivity water scarcity water storage water supply