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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...

Blue-green infrastructure (BGI) is part of European policies to address climate change that has occurred in recent years. In Sandanski region, Bulgaria, data from the European Centre for Medium-Range Weather Forecasts (ERA5) show that since 1979, air temperatures have risen by 2.3 degrees Celsius, with an upward trend. Meanwhile, there is no permanent decrease in precipitation, but there are extreme events and alternating cycles of floods and droughts. BGI can mitigate climate change by cooling the effect of veget...