PART 8
8.1. Conclusion statements
The Nominated Monitoring Agents based on the evaluation of the environmental
monitoring results concludes:
- Based on the measurements performed at the Doborgaz and Helena profiles, it
can be stated that the amount of water discharged to the Danube riverbed in the
hydrological year 1999 was 443.64 m3.s-1
. This means that according to the water management agreed in the
intergovernmental Agreement, signed in 1995, the obligation of the Slovak party
to discharge 400 m3.s-1
to the Danube was fulfilled. The discharge to the Mosoni branch of the Danube
and to the right side seepage canal was 41.98 m3.s-1
(40.20 m3.s-1
+ 1.78 m3.s-1
). The amount of water have to be discharged to the Mosoni branch of the Danube
was fulfilled as well.
- The measures realised according to the intergovernmental Agreement, signed in
1995, did not cause significant water quality changes in the Danube, comparing
to the previous year. The water quality in the right side river arm main
branches follows the water quality in the Danube. Its tributaries and pollution
from the settlements on the Hungarian side primarily affect the water quality in
the Mosoni Danube, observed at the Vének profile.
- Based on the ground water regime evaluation of the hydrological situations
before and after realising the water supply, enabled by the technical measures
and discharges according to the intergovernmental Agreement, signed in 1995, it
can be concluded that the water supply has caused significant rise of ground
water levels on the Hungarian territory – effected by the water supply - for
low and average discharge conditions in the Danube, except in the narrow strip
along the Danube riverbed. Comparing the hydrological situation at high
discharge conditions it can be stated that the water supply did not caused a
significant change in the ground water levels.
- According to the ground water quality monitoring it can be stated that some
parameters have changed due to the water supply realised on the Hungarian side.
These changes are not significant and do not cause changes in the classification
for drinking water supply. In general, it can be concluded that the water
quality parameters in the drinking water wells are stabile on both sides.
- The soil moisture conditions on most of the monitoring areas in comparison
with the previous year were better. The ground water level fluctuated in the
soil layers and in most cases supported the soil moisture content. The position
of ground water does not allow moisturising of the shallow soil profiles in the
upper and middle Szigetköz.
Due to the favourable hydrologic and climatic conditions the development of
forest stands correspond to the usual growth standards. Some changes were
observed on monitoring sites along the Danube river bank or on monitoring sites
with older stands where the growth on forest stands on shallow soils lag behind
the expected growth rate. The health state of poplar stands was very good. Trees
had rich and wide crowns. On the other hand, the willow stands, especially on
the upper and middle part of the Szigetköz, were characteristic by middle
health condition only. However, there were a lot of young shoots observed
on the drying trees due to the favourable conditions. But the moisture
conditions on these stands due to the missing floods became unfavourable for
willows. According to the evaluation of aerial photographs taken on August 22,
1999 the health state of the forest on Slovak territory is very good. Based on
the results it can be stated that the average defoliation of trees was 13.2 %.
During the observation period the same species remain dominant on the
phytocoenological monitoring areas. Only the values of dominance are changing.
On the monitoring sites in the area influenced by the drainage effect the
hygrophilous species are replaced by species tolerant to drier conditions. The
drying was stopped on several sites where the introduced water supply is
sufficient. However on several monitoring site there were observed higher number
of species characteristic for drier biotopes. In the tree and shrub layer there
were no significant changes observed in the last years. Signs of rearrangement
were detected on sites affected by the drainage effect near the main river bed.
Considering the terrestrial molluscs it can be stated that on most of the
monitoring sites original hygrophilous species are returning. Changes in aquatic
fauna reflect the changes in the river arm system. Generally it can be stated
that along the water supply path the number of species rose; the number of
rheophile species increased. The species composition became stabile.
8.2. Proposals
- The Hungarian Party will complete the long term ground water quality
evaluation for the remaining observation objects.
- The Hungarian Party will prepare a proposal for replacing the excluded forest
monitoring sites with new ones. The evaluation of the hydrological year 2000
will consist of evaluation of the dendrometric measures for the relevant year
too. The evaluation of the aerial photographs taken in 1999 on the Hungarian
side will be started.
- The Nominated Monitoring Agents agreed that a long term evaluation of selected
the groups of biological monitoring will be prepared. The evaluation period will
include the data from 1992 to 2000. The experts of both Parties will agree the
method of long term evaluation.
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