The objective of this work is to experimental establish of characteristic ground water depth, required for checking reversibility between drainage and subirrigation, with DrenVsubIR software in the experimental drainage field Avram Iancu, Bihor county. The experimental drainage field from Avram Iancu was set up in 1983, on a gleical, cambical phaeosiom with a high content of colloidal clay, higher with 50 % on the entire profile. The DrenVSubIR soft, is a calculating program implemented by Faculty of Environmental Protection from Oradea and consists of three modules, the first one is of calculating the distance between drain wires with the relation Ernst – David, the second for checking the possibility of using the drainage at subirrigation and the third for the technical economical (the cost) calculus of ha, of drained field. In the observation period from Avram Iancu, between 1984 and 1990 was measured in hydro geological drills in the field, the depth of ground water and soil humidity in the upper horizon. The correlation between the inverse of soil humidity in the upper horizon and the depth of ground water, measured in hydro geological drill in the field is linear and very significant, the correlation coefficient is R = 0,9907. With the help of this correlation was establish the depth of ground water corresponding at the field capacity is H0 = 0,69 m and the depth of the ground water corresponding at the minimum easily available water content is Hm = 0,98 m. Using the “Verificare la SUBIRIGAŢIE - Ecuaţia David” module of the DrenVsubIR program, for drainage variants that have been conventionally designed results the possibility of reversibility between drainage and subirrigation when distances. Considering that the cost of this extra investment is not linked to the distance between drains the most indicated variant for subirrigation from Avram Iancu drainage field is the one with the biggest distance between drains L = 30,4 m, associated with ruble filter prism of 0,2 m (Fî) and deep loosening through scarification (Sc).

drainage; subirrigation; DrenVsubIR soft

Presentation: oral