443 Analele Universităţii din Oradea, Fascicula Protecţia Mediului Vol. XIX, 2012 ANALYSIS OF THE LINKS BETWEEN THE AFFORESTATION OF SMALL WATERSHED AND ITS TRIBUTARIES FLOW CRIŞ PRESENT IN FOREST FUND Iovan Călin Ioan,* Sabău Nicu Cornel * University from Oradea, Faculty of Environmental Protection, 26 Gen. Magheru St., 410048 Oradea; e-mail: calin_iovann@yahoo.com Abstract The aim of this work is the analysis of afforestation of the Crişul Repede and Crişul Negru’s hydrographic subbasins, respectively the Iada Valley, Brătcuţa, Finiş, Tărcăiţa, Văratec and Crişul Pietros respectively, in order to value the water flow and its power in the forestry sector. The exponential correlation type realized between afforestation and of the multiannual flows of the small hydrographic basins from the Crisuri (Rivers) is statistically significant. Key words: links, hydrographic basin, flows, afforestation INTRODUCTION The Crişul Repede River springs from the Apuseni Mountains in the south east of the Huedin Depression at an altitude of 710 meters. It flows to the north west until it reaches Ciucea from where it heads to the west (towards Oradea). It has a longitudinal profile characterized through an average slope of 3‰ and it has a hydrographic basin with a surface of 2973 km² (7.***1) The Crişul Negru River springs from the Bihor Mountains from an altitude of 1460 meters. It collects its water from the west slopes of the Bihor Mountain and from the slopes concentrated in the Beiuş-Vaşcău depression, from a hydrographic basin situated in the west part of the country, having a surface of over 4400 square kilometers and it drains, in its superior parts, the west slope of the Bihor-Vlădeasa Mountains, the south- west slope of the Pădurea Craiului Mountains and a great part of the Codru Moma Mountains. The length of the basin is of 100 km and its width is of 70 km (Bîdiliţă F.,2009) ►The Iada Valley river that divides the mountain massifs of Pădurea Craiului and the one of Vlădeasa Mountain. This river has a length of 46 km from its springs (from Vlădeasa Mountains) until it flows into the Crişul Repede River. It has an average slope of 22 ‰, a hydrographic basin’s surface of 215 km 2 and the surface of the forestry fund is crossed by 13251 hectares (8***2). ►Brătcuţa Valley springs from the Pădurea Craiului Mountains. It has a length of 14 km and an average slope of 35 ‰. It crosses a forestry fund of 2020 hectares; it has a hydrographic basin of approximately 50 km 2 and it