IWRA Proceedings

In this work a water-balance model was tested when applied to a natural pilot basin, and the results being contrasted with those given by the measurements in a hydrometric station in El Espinar (Segovia, Spain) located at the basin outlet. On the other hand, the main watery basin flows have been identified and assessed accurately, both through their numeric and cartographic parameters. By means of software ESTCLIMA, the average monthly climatic parameters for every spot in the land were obtained, using a land base held by a Digital Elevation Model (DEM). The graphic result was a number of maps matched to annual average temperature, annual rainfall, number of rain-days in a year and maximum month average storm. It was also determined the water retention capacity of soils in every point in the basin, getting a graphic output which shows the quantity of water (in litres) for every m2 in surface and 1,25 m in depth. Finally, and in every spot in the basin, the values of the main parameters in the water balance were obtained, both numerical and graphically, that is: net water volume infiltrated, runoff flow, internal drainage water volume and average water volume soil-retained. All these values were compared to the total water volume measured at the basin final point.