M-TROPICS/MSEC is the network of three agricultural headwater catchments representative of the sloping lands of South-East Asia (Laos, Thailand, and Vietnam). It was launched in 1998, and started collecting data since 2000 on climate, land use, agricultural practices, stream discharge, suspended and bedload sediment yields.
The peri-urban Dong Cao catchment (49.7 ha) is located within the hills of Tien Xuan in the Thach That district of Hanoi, Hoa Binh province, in Northern Vietnam. The elevation of the catchment ranges between 118-482 m a.s.l. The slopes range from 20 to 60%. The catchment belongs to a larger lake catchment area of 538 ha with slopes changing gradually from 120% (~60°) to virtually 0% (0°).