Pressure and impact analysis requires information on the main drivers and
changes in conditions. In order to analyze such pressures and impacts, each
river basin requires: an analysis of its characteristics, a review of the
impact of human activity on the status of the surface water and an economic
analysis of water use. Pressure and impact analysis plays a central role in
the planning of river basin management. The quality of the stream at any
point depends on several major factors: lithology of the basin, weather
conditions, climate, and human impacts. Most of the polluters are located in
the big cities next to canal DTD Becej-Bogojevo canal (Odzaci,Vrbas,
Srbobran, Becej). Per year, 2900000 m3 of wastewater was discharged into the
Becej-Bogojevo section of the DTD canal: 1,4 tCOD, 0,8 0tBOD, 260 kg of
nitrogen, 19 kg of phosphorus and 282 kg of suspended solids. Of the total
volume of wastewater, 20% comes from industry and 80% from municipal
wastewater. Most of the wastewaters from the studied polluters is discharged
untreated or insufficiently treated (only primary treatment). This poor
quality wastewater threatens the receipients into which its is discharged.
Comparison of the wastewater quality results to the Decree on emission limits
and deadlines for their achievement, shows that many polluters exceed the
limits for all parameters (COD, BOD, nitrogen, phosphorus, suspended solids).
On the basis of the physico-chemical analysis of the water from the DTD
Becej-Bogojevo canal it can be concluded that the water quality is
unsatisfactory. According to the national legislation, the water quality
exceeds the values for good potential streams for most parameters at all
sampling locatio dissolved oxygen, organic matter and nutrients). Thus, we
can conclude that the water in the studied section of the DTD Becej-Bogojevo
canal does not meet the criteria for "good ecological potential". The most
vulnerable locations are downstream of the Vrbas and downstream of the Becej,
while the best quality canal water is at the furthest upstream location (CS
Bogojevo). Risk assessment based on monitoring results indicates that the
water of the studied section of the DTD Becej-Bogojevo canal is probably at
risk of failing to meet the objectives of the Water Framework Directive, as
33% of the analyzed parameters to calculate specific risk ratios were greater
than 1, and thus fall into the category of pollutants medium risk. In order
to achieve the quality (to achieve good status and good potential), there
must be a response from industrial producers, which consists primarily of
comprehensively understanding the problems and implementing measures to
minimize the impact of these problems.
Are zooplankton useful indicators of water quality in subtropical lakes with high human impacts?
