**2. Data collection**

134 Studies on Water Management Issues

rivers. Theoretically speaking, total water resource in Romania was in 2009 of 136,600,000 thousand m3 while that existing, according to the degree of development of river basin, is 40,482,841 thousand m3 under the terms of a national requirement of 12,265,698 thousand m3 (http://www.anpm.ro/ Mediu/rapoarte, accessed 2011). Taking into account only the contribution of inland rivers, from this point of view our country may be included in the category of countries with relatively low water resources in relation to the resources of other

Generally speaking, monitoring water quality represents the activity of observations and standardized measurements and continues long-term awareness and evaluation of the parameters characteristic of water for household chores and defining the status and trend of the evolution of their quality, as well as permanent highlighting condition of water

In Romania, the quality of water is monitored according to the structure and the methodological principles of Integrated Monitoring System of Wastewater in Romania (S.M.I.A.R.), restructured in accordance with the requirements of European Directives. The inventory of the water pollutants is performed at regional level, based on the information delivered by the inventoried economical operators and statistical data collected and processed by regional competent authorities. The national system for monitoring water comprises two types of monitoring, in accordance with legislative requirements in the area: monitoring of supervisors having the role of assessing the status of all bodies of water in the river basin and operational monitoring (integrated monitoring displays) for bodies of water which have a risk not to fulfil the objectives of water protection (Oroian&Petrescu–Mag,

For the evaluation of chemical water quality overall, in each section, were calculated for each indicator, mean values, and these were compared with the limit values of the quality classes set by norm with five quality categories, resulting employment in one of the five quality categories. The indicators included in the Order of the Ministry of the Environment and Forests no. 161/2006 approving the Norms on the classification of the quality of surface waters in order to establish the ecological status of water bodies, were divided into five main groups (Oroian&Petrescu–Mag, 2011; http://www.anpm.ro/ Mediu/rapoarte,

• the group "oxygen", which includes: dissolved oxygen, BOD5, COD - Mn, COD - Cr; • the group "nutrients", which includes: ammonium, nitrites, nitrates, total nitrogen,

calcium, magnesium, total iron, total manganese, chlorine, sulphates;

• the group "general ions, salinity", which includes: filterable dry residue, sodium,

• the group "metals", that contains: zinc, copper, chromium, arsenic; metals such as lead, cadmium, mercury, nickel, were assigned to the group of priority substances; • the group "organic and inorganic micro pollutants", which includes: phenols, detergents, AOX, petroleum hydrocarbons; other substances, such as PAH, PCB, DDT, lindane, atrazine, tetrachloromethane, trichloromethane, tetrachloroethane, etc. were

Emphasizing the evolution of surface water, wastewater and ground water quality in Romania for the period of 5 years between 2005 and 2009, and testing the multiregression analyze model in order to predict this evolution, are the main objectives of our study.

resources (Hirsch et al., 2009; Goyal et al., 2010; Odagiu, 2010).

2011; http://www.anpm.ro/ Mediu/rapoarte, accessed 2011).

orthophosphates, total phosphorus, chlorophyll a;

assigned the group priority substances.

countries.

accessed 2011):

Usually, monitoring the quality of water resources at national level cannot be performed by the measurement of only one parameter, because of many reasons. The water quality indices are variable in time and space, and this needs complex monitoring activity involving the measurement of a series of chemical physical and biological parameters according to special patterns, which are changing over time function of external conditions. Some of the above mentioned indicators provide general information concerning water pollution, whereas others enable the direct tracking of water pollution sources.

The data concerning the main water pollutants were collected from annual reports elaborated by regional authorities and from public data delivered by the reports of the Ministry of Environment and Forests, and annual environmental reports of the National Agency of Environmental Protection.
