Institute for Development of Water Resources Jaroslav Černi and the Republc Hydrometeorological Service of Serbia carried out detailed processing and analysis of available hydrometeorological data within the amendments of the draft for Water Management Master Plan of Serbia in 2009. In this particular case, the most important characteristics of time series of hydrological and meteorological parameters on key sections of hydrological and meteorological stations, their conventional processing and analysis was completed and updated. The final goal of amendments of the draft of Water Management Master Plan is to provide elements to define the balance of available water resources in the territory of the Republic of Serbia, necessary for defining the strategy of water use and defining the conditions for integrated and rational management. This paper presents the most important elements of water balance using modern GIS technology.

This paper presents hydrological parameters relevant for defining of water balance and water protection in the territory of the republic of Serbia. the parameters are taken from the Master Plan of the Republic of Serbia (2009) in which data processing was performed for 143 hydrological stations, 437 precipitation and 56 climate stations of the Republic Hydrometeorological Service of Serbia for the period 1946-2006. Data for pluviograph stations are taken from scientific and research base for the implementation of the VIS, where data processing was carried out for 30 pluviograph stations for the period from the beginning of the operation until 2008. For the purposes of making the Strategy for Water Use in Serbia, spatial interpolation of all relevant parameters respecting the altitude was carried out. The relevant parameters are presented in the form of GIS maps of isolines.

Scarce natural resources which are important for development of society or civilization itself are the issue of research for economists from the point of view of their efficient utilization. Theory of natural monopoly asserts that for society is better to treat scarce resources as monopoly than to put them on free market. The assertion is that it is better to invest in development of other markets than into free competition in sphere of some scarce resources. Main aim of this paper is to overview some elements of theory of natural monopoly.