BALWOIS 2004 Ohrid, FY Republic of Macedonia, 25-29 May 2004 Effects Of Erosion Control Work In Some Torrents In The Republic Of Macedonia Ivan Blinkov, Alexandar Trendafilov University “St. Cyril and Methodius” Skopje, Republic of Macedonia, Abstract Torrential flows (flash floods) are very often. There isn’t any city in Macedonia without problems with torrents and consequences of them: sedimentation of lot of material in the urban area, destroyed streets, bridges, houses, other infrastructure facilities and they cover agricultural land with sterile sediments (stones, gravel, etc.). In this analyzes one torrential group was analyzed: torrents – tributaries of Kamenicka Reka (tributary of reservoir Kalimanci). Catchement area of Kamenicka Reka is 112.2 km 2 . This area is maybe the most erosive catchment in the Republic of Macedonia. Whole are belonging to I, II and III category of destruction. Mean values of erosion quotient is Z = 0.67. Mean annual production of erosive material is 150 000 m 3 . There are a lot of erosion control works constructed in the up mined torrents. Sediment behind barrages was geodetically measured. Data about forest cover and elements was extracted from forest managing plan. There are 51 built barrages in torrents-tributaries and about 618 other cross construction. A great part of barelands in the catchment was afforested. As a result of all erosion control works, at about 1 000 000 m 3 sediment is deposed behind the cross constructions. Key words: torrents, erosion Introduction Due to the report of The European Environment Agency, Republic of Macedonia, together with Yugoslavia and Albania performed “red zone of water erosion in Europe”. Role of other erosion types to soil degradation in the RM is insignificant. According to the EROSION MAP of RM, 96.5% of the total area is under processes of erosion... An amount 9 423 km 2 or 36.65% of the total state territory is encompassed by stronger categories (I – III). The total annual production of erosive materials on the whole territory is about 17*10 6 [m 3 /year] or 685 [m 3 / km 2 . year], which of 7.5*10 6 [m 3 /year] or 303 [m 3 / km 2 . year] are carried by. Significant part of these deposits, about 3*10 6 [m 3 /year] is not carried through the downstream sections of the rivers to the exit of the state territory, but deposed in nature lakes and artificial reservoirs. Water erosion is dominant type in RM. Kamenicka Reka (Kamenicka River) is the biggest tributary of reservoir Kalimanci (Fig.1). This area is one of the most erosive catchments in the Republic of Macedonia. Whole area belongs to I, II and III category of destruction. There are a lot of erosion control works constructed in the up mined torrents. Sediment behind barrages was geodetically measured. A great part of barelands in the catchment was afforested. Water bodies protection and Ecohydrology 1