Tham khảo tài liệu 'studies on water management issuese part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 110 Studies on Water Management Issues Flysch bedrock of the case areas was formed in Eocene as a product of the sea sediments and undersea landslides. Flysch consists of repeated sedimentary layers of sandstones marl slate and limestone which can quickly crumble under the influence of precipitation and temperature changes. Brown eutric soils are shallow and due to silt-loam-clay texture difficult for tillage with appropriate agro-technical measures deep ploughing organic fertilisers they obtain properties for vine or olive production. In case of inappropriate agricultural activities and land management we can witness very strong erosion processes. Both areas are characterized by sub-Mediterranean climate NE Mediterranean with southwestern winds and warm and moist air. Average annual temperature at the station Bilje the Reka catchment for the period 1991-2009 was C with the highest and lowest monthly average in August C and January 4 C . Average annual rainfall in the period 1992 - 2008 was 1397 mm with peaks between September and November max. in September 184 mm . Average annual temperature at the Portoroz station the Dragonja catchment for the period 1991 - 2009 was C with the highest and lowest monthly average in August C and January C . Average annual rainfall in the period 1993 - 2008 was 930 mm with peaks between September and November max. in September 130 mm . Both catchments are characterized by fractured aquifer where water trapped between flysch layers forms surface springs. Alluvial aquifer in the valley bottom overlays impermeable flysch. River network of the two areas is very extensive. Rivers character is torrential and mediterranean. The river Reka hydrograph recorded 1993-2008 the highest flow rates between October and January with the average flow of m3s-1 in November and the maximum m3s-1 in October 1998 and extremely low in the summers. Hydrograph of the river Dragonja recorded 1993-2008 the highest flows .
