Infl uence of Soil Water Retention Properties on Hydrological Cycle and Water Budgeting Module Simulation

Th e complexity of water budgeting module as shown in this paper is represented in phases. By experimental measurement of precipitation and lysimetric measurement of percolation runoff the fi rst phase establishes monthly and annual soil-water budgets of skeletal and clayey soils, and hence the infl uence of soil water-retention potential on hydrologic cycle and water budget over a four year period in the area of Mostar. Th en, a soil-water budget model is simulated in a simplifi ed procedure in order to determine the corresponding soil productive water reserve (R) for given soils. In this way, depending on R values, the output parameters of the simulated model may produce diff erent results in: calculated surplus or percolation runoff , real evapotranspiration (RET) and water defi cit. Th e lysimetric measuring of the water input and output in skeletal and clayey soils determined signifi cant diff erences in the water budgets of these, by physical properties, divergent soils. Such correlations indicate that there is a realistic possibility of computing new, relatively reliable and pragmatically signifi cant agro-hydrological parameters using measured precipitation and calculated PET. Also, this paper addresses a correlative analysis between the apple and maize ET on one side, and evaporation measured by Piche and by Class A, as well as PET calculated by Th ornthwaite, Turc and Penman, on the other side. Th e results show a reliable reaction between ET of apple and maize with E by Piche, while the same relation is even more reliable with Class A. Other methods in this correlative analysis are less reliable.