ASSESSMENT OF SURFACE AND SUBSURFACE DRIP IRRIGATION SYSTEMS WITH DIFFERENT SLOPES BY HYDROCALC MODEL

The HydroCalc simulation model is considered one of the designs, planning and evaluating the hydraulic parameters of irrigation systems, and using this model added more advantages to the measurements of hydraulic evaluations of irrigation system. Field trials were conducted in the research farm and production center of the National Research Centre at El-Nubaria, El-Behaira Governorate, Egypt. In the field of irrigation system management, in drip irrigation automatic system, the use of sensors installed in the soil determines the water needs. So as to adjust the water added amounts depending on the timetable for the process of irrigation field, which varies from one crop to another. The results could be summarized as follows: using a lateral line length of 60 meters, the friction loss values expected and calculated which were estimated under drip surface and subsurface irrigation systems; subsurface was greater than the surface drip irrigation. The correlation coefficient between the values of the compressor losses due to friction were greater than 0.9. This shows a strong correlation between the predicted values, which were estimated. Significant differences were found between the treatments and the interactions between irrigation systems. The HydroCalc simulation model is recommended for evaluating the subsurface irrigation systems.