This project aims to increase the understanding of how water quality in headwater streams in Montane Mainland Southeast Asia (MMSEA) is affected by plausible changes in both climate and land-cover/land-use. Using sediment dynamics and down-stream linkage data, which will be determined in the field study, the project attempts to distinguish the degree of various types of anthropogenic change affecting erosion, sediment delivery, and water quality. Currently in its second year, the project's research component targets to continue monitoring and sample collection in the instrumented basin in Thailand and perform modeling analyses to test various sediment modeling approaches. Plans are also underway to conduct similar projects in India, China and Viet Nam as part of its extension component. The new data generated by the project could be used to guide development- and sustainability-related policy, bolster regional climate impact assessments, and contribute to ongoing studies investigating related phenomena.