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Demographic problems are at the root of the various challenges in terms of the environmental protection. That is why the prospect of developing all kinds of activities in this direction requires much more serious analysis and evaluation. According to these reasons, an analysis of the available information on the demographic structure of the Blagoevgrad region, it isoffers a specific commentary and forecast of the prospects for the future activities for of the environmental protection.

In the present article some morphometric characteristics of small catchments (a total of 28) in the Mesta River were calculated and mapped. Some of the maps are obtained by calculation based on a vector model. For the detailed study, we used digital elevation model (DEM) for the surveyed territory and the application of a cartographic algebra in the GIS environment. As a result, GRID models have been obtained for some of the parameters. Different thematic maps (i.e. Surface runoff direction, Classification of the river network, Orientation of the catchments, Topographic factor of the slope of catchments, Kernel drainage density, Standard deviation of elevation, Basin-scale Ruggedness etc.) have been prepared by using the ArcGIS software. Authors have computed more than 20 morphometric parameters of all aspects. This study is very useful to implement different analysis of hydro-morphometric characteristics of catchments and also to solve various hydrological problems for watershed management.

Physiographic conditions for occurrence of river floods and inundation in small watersheds of southwestern Bulgaria on the example of Aydarovska River, a left affluent of Struma River, are considered. Some measurements of water quantity are made and the weather conditions in river floods during the winter of 2015 are analyzed. The presented own data show that this type of processes are widely spread and often accompanied by debris flows.

Physiographic conditions for occurrence of river floods and inundation in small watersheds of southwestern Bulgaria on the example of Aidarovska River, a left affluent of Struma River, are considered. The morphometric parameters of the drainage basin are calculated based on GIS. The presented own data show that this type of processes are widely spread and often accompanied by debris flows.

The advantages and disadvantages of Open Source and commercial software for 3D modelling.