Dong Cao catchment

Dong Cao is located in Northern Vietnam, Hanoi Province, and is divided into 2 nested sub-catchments (total 49 ha), on schist soils. Slope gradient is 20-60%, and rainfall is about 1500 mm per year.

Land use change: switch from cassava + maize to natural regrowth vegetation + few tree plantations + feeding stuffs and village encroachment.

 

Hydro-meteorological and soil losses surveys since 2002

Weir with water level recorder and automatic sediment sampler in Dong Cao catchment (photo: C. Valentin)
Main weir of Dong Cao catchment full of bedload sediments after an extreme rainfall event (typhoon) (photo: J.-L. Maeght)