(3) rivers Explanation: Dendritic drainage systems are the most common form of drainage system, The term Dendritic comes from the Latin word "dendron", meaning tree, due to the resemblance of the system to a tree. In a dendritic system there is one main river (like the trunk of a tree), which is joined and formed by many smaller tributary rivers. Dendritic systems form in Vshaped valleys; as a result, the rock types must be impervious and non-porous.