Research Concerning the Event of Uncontrolled Installation of Forest Vegetation on the Torrential Managed Network in the Upper Tarlung Watershed

Abstract

After 20-25 years from building the hydrotechnical structures for managing the hydrographic torrential network on the Tarlung Valley, the event of uncontrolled installation of forest vegetation on the central corridor of flow, upstream the structure, has developed on a surface of approximately 110 m2 on average. The average blocking degree of the flow corridor was of approximately 37%. The variability of the event, from case to case, was highly salient (s% = 74...84%). By applying the 2 test, we demonstrated that the experimental frequency distribution meets the condition of normality, only with regard to the size of the surface on which the forest vegetation on the flow corridor has installed, and not in terms of the blocking degree of this corridor.