The watershed (DAS) Deli is one of the priority watersheds in the Medium Term Development Plan (RPJM) of 2010 - 2014 according to the Ministry of Forestry decree (SK 328 /Menhut-II / 2009). DAS is a complex ecological system, in which there is a dynamic equilibrium between the incoming material energy (input) and the material out (output). In natural circumstances the change in input and output balance is slow and does not pose a threat to humans and environmental sustainability, but on a watershed system with continuous land-use dynamics from dense vegetation forms to rare vegetation forms or from vegetation forms to shapes non vegetation. Deli land destruction is dominated by biophysical factors, especially land use, slope, landform, and rainfall in upstream Deli sub watershed. This is what causes flooding in Medan. The cause is extreme rainfall, so that a number of rivers such as Deli river and Babura river overflowed, the water level of the Deli and Babura rivers almost reached the bridge section and this is scarce. Deli land destruction is dominated by biophysical factors, especially land use, slope, landform, and rainfall in upstream Deli sub watershed. This is what causes flooding in Medan.The cause is extreme rainfall, so that a number of rivers such as Deli river and Babura river overflowed, the water level of the Deli and Babura rivers almost reached the bridge section and this is scarce.
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