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Bulgaria is characterized by a high level of landslide activity and erosion-abrasion processes. The main factors affecting slope stability often include rising groundwater levels, river erosion, abrasion, flash floods, and surface runoff. Traditional horizontal or vertical drainage systems may take months or even years to become fully effective. To expand drainage options for steep slopes and accelerate the dewatering process, this paper reviews current drainage practices and surface runoff management at two sites...