1. RISK ASSESSMENT IN CASE OF FAILURE IN THE WATER SUPPLY SYSTEM. Authors: I.E. KELLER, I. HAIDU.2. ESTIMATION OF SOIL WATER INFILTRATION USING CN (CURVE NUMBER) INDEX AND G.I.S. TECHNIQUES - APPLICATION: SăCUIEU HYDROGRAPHIC BASIN-. Authors: I. HAIDU, A.I. CRĂCIUN.3. REMOTE SENSING AND GIS FOR THE FOREST STRUCTURE ASSESSMENT AT THE SMALL BASINS’ LEVEL IN THE APUSENI NATURAL PARK. Authors: I. HAIDU.4. VALIDATION OF SEVERAL ATMOSPHERIC STABILITY INDICES FOR THE STORMS GENERATING TORRENTIAL RAIN SHOWERS IN THE NORTH-WEST OF ROMANIA: http://studiageographia.geografie.ubbcluj.ro/wp-content/uploads/2014/12/03_Haidu_Tudose_37_46.pdf. Authors: T. TUDOSE, I. HAIDU.5. RAINWATER MANAGEMENT AIMING TO IMPROVE THE QUALITY OF URBAN SURFACE RUNOFF: http://studiageographia.geografie.ubbcluj.ro/wp-content/uploads/2016/02/Haidu.pdf. Authors: I. HAIDU.