Local Plan for Sustainable Development of Sibiu Municipality

14
MUNICIPALITY
main river is the Cibin River, which receives two
tributary streams on the territory of the city; from the
right side, the Trinkbach brook and the Valea
Săpunului, and two tributary streams from the left side,
the Fărmândoala and Rusciorului brooks.
On the Cibin River, upstream from the Gura Râului
village, a concrete retention dam was built during
1973-1980. It had the role of supplying the
municipality of Sibiu and the adjacent cities with water
and energy, as well as diminishing the force of the
flood wave during flood time.
There are 4 dams on the Trinkbach brook, for
recreational purposes and for flow regularization.
To the east, the city is bordered by Valea Săpunului, a
channel leaving from the Şteaza brook (Răşinari
zone), which carries a controlled water flow and which
can be used for diverse purposes.
An important role for the flora in Sub Arini Park is a
controlled channel that leaves from the Village
Museum, and supplies the underground water stream
– the trees reservoir on the left side of the park.
The quality of the underground water layer is
monitored by two drillings, for which regular analyses
are carried out. Since in recent years there has been
no periodic pumping of the water in the drilling holes,
analysis results are not reliable in investigating the
pollution levels of the phreatic layer. Presently, the
water from the underground layer is used in low
quantities in industry or as drinking water.
The Cibin River has an annual average flow of 2.8
cubic meters per second under a managed regime.
From the water quality point of view, the Cibin River
has the 2 nd quality category at the entrance in the city,
and passes to the 3 rd quality category downstream of
the city, because of the partially treated effluents. The
flow degrades itself after the Mohu treatment plant, 10
km downstream from Sibiu.
Water – supply sources
Water supply for Sibiu was provided from sources that
depended on the socio-economic development of the
city. The first water source was built downstream from
Răşinari, from Ştezii waterside, which later was
completed with supplies from water streams in Păltiniş.
After 1975, the flow from the available sources
became insufficient, so a new supply source had to be
identified. This was the Cibin River, upstream from
Gura Râului. Thus, the concrete dam was built, as a
permanent reservoir, 25 km upstream from Sibiu, with
a volume of 15.5 million cubic meters of water, which
can supply Sibiu and the adjacent cities with a volume
of about 50 million cubic meters per year.
The analysed water meets the quality requirements for
processing into drinking water and it is a reliable water
source for Sibiu and the adjacent cities. The untreated
water is transported through two pipelines of Ø 1 000
and Ø 600 to the Poplaca treatment plant and from
there, it is gravitationally transported to consumers.
The Sadu River is considered a supplementary source
for water supply; for this reason, a pipe system and a
supply were built here. A new accumulation on one of
the streams tributary to Olt River can be considered to
be a future source.
Water – aggressive element
Until the building of the reservoir on the Cibin River,
Sibiu was often flooded, even if some of the districts
had dams.
There are reservoirs on the Trinkbach brook, which
take the big flows from its hydrographic basin and
discharge them downstream, in a controlled manner.
The flooding of properties in the vicinity of the
Trinkbach brook course is sometimes caused by not
using the reservoirs at projected parameters.
Summing up, the surface water can not flood Sibiu, if
the existing reservoirs are correctly operated during
flood time.
STRONG POINTS WEAK POINTS OPPORTUNITIES RISKS
1. GURA RÂULUI ACCUMULATION
Rich source for water supply
Necessity for partial
replacement of the supply
Guarantee of a continuous
water flow at optimal supply
parameters
Negative impact on the rising of
costs of water