National Id
HU_03
Site name
Körös-ér, Nagykörös town
Summary
The Körös stream catchment lies in a droughts stricken region of Hungary, it is a heavily modified water body. There are nutrient overload in the stream and in the ground water as well both from point and diffuse sources that are both agricultural and urban. Meanwhile recurring water logging periods cause temporary flood problems for the settlement and the agricultural areas during early spring and in case of torrential rains.
The water directorate in order to cope with the situation upgrade of the stream’s water management structures to be able to cope with both water extremes: floods and water shortage. It reconnected former floodplains at the estuary on a 2500 meter section. Also upgraded the sluices to let them able to retain water but cleaned the bottlenecks to facilitate runoff at flood events. At the settlement section of the stream the development targeted to provide the necessary capacity to drain the residential area. Upstream of the settlement retention pond were created to control runoff through the town and store water.
Light or indepth?
In-depth
The in-depth description of the case study
cs-hu-03-final_version.pdf
NUTS Code
Közép-Magyarország
RBD code
HU1000
Transboundary
0
Data provider
Gábor Ungvári, REKK
Source(s)
KÖRÖS-ÉRI BELVíZFÅCSATORNA MEDERFEJLESZTÉSE ÉS REKONSTRUKCIÓJA Riverbed development and reconstruction of the Körös-stream drainage channel. “ Feasibility study
Good practices handbook
Yearbook of the Middle Tisza District Water Directorate
NWRM(s) implemented in the case study
Retention Ponds
Floodplain restoration and management
Longitude
19.984447
Latitude
47.047282
Climate zone
warm temperate dry
Mean annual rainfall
300 - 600 mm
Mean rainfall unit
mm/year
Average temperature
10,3000001907349
Mean evaportranspiration
800
Mean evaportranspiration unit
mm/year
Mean runoff unit
450 - 600 mm
Average runoff coefficient
0,25
Average imperviousness
0,25
Type
Case Study Info
Mean annual runoff range
0 - 150 mm
Average slope range
0-1%
Monitoring impacts effects
1
Monitoring parameters
chemical
Performance impact estimation method
Catchment outlet
Performance impact estimation information
Standard water quality monitoring of the water body by the WFD aspects
Application scale
River Basin
Installation date
2011-08
Lifespan
33
Performance timescale
Immediate
Area (ha)
48100
Area subject to Land use change or Management/Practice change (ha)
5
Size
5
Size unit
ha
Design capacity description
100000 m3
Constraints
Negative way: The watershed belongs to three counties NUTS HU102 , 322, 331, and two different regions HU1, HU3 that belong to two different regional development fund subsidy level. It caused big difficulties and delay to secure EU funding and acknowledge the overstretch characteristic of the project.
Favourable preconditions
Positive way: The areas that are necessary for the development of the structures belong to public ownership. Upstream from the settlement there is interest for recreational use of the stored water
Design contractual arrangement
Arrangement type Responsibility Role Comments Name
Design consultation activity
Activity stage Key issues Name Comments
Design land use change
Land use change type
Design authority
Authority type Role Responsibility Name Comments
Regional / sub-national water authority
Initiation of the measure
Kí¶zép-Tisza-vidéki Ví­zí¼gyi Igazgatóság - Middle Tisza District Water Directorate
Other
Other
Local governments of the area
Local governments, role in public relation
Other
Determination of design details of the measure
Duna-Ipoly National Park
National Park
Other
Other
Water Management Association South Pest County
Local water management assotiation, represented farmers' interests
Key lessons
The development aims to manage both water extreme of a small water course water logging problem in residential and agricultural areas and low water or lack of water in the stream that results in bad water quality due to point and diffuse effluents. The technical elements are necessary, but not sufficient parts of NWRM measures. Using only the limited public lands along the water courses can provide only a limited set of the potential effects. Water quality improvements by natural assimilation needs more surface to interact with the polluted water.
EU funds can help overcome the technical shortages, but it can†™t make the interest resolution on a landscape scale avoidable between the different public and private interests. The works are ready to supply the potentially changing demand for more retention.
Success factor(s)
Success factor type Success factor role Comments
Financing possibilities
main factor
Legal obligations
main factor
Financing
Financing type Comments
EU-funds: Cohesion and regional development funds
Barrier
Barrier type Barrier role Comments
Other
secondary barrier
the counter interest of private land owners along the watercourse to agree on water tolerant land use practices
Driver
Driver type Driver role Comments
Legal obligations
main driver
Financing share
Financing share type Share Comments
Policy description
The Körös stream catchment lies in the most droughts stricken region of Hungary. There are repeating surface water resource shortages, the ground and subsurface water levels are declining at the uppers section. There are nutrient overload in the stream and in the ground water as well both from point and diffuse sources and both agricultural and urban. There are hydro-morphology problems as well.
Meanwhile recurring water logging periods cause temporary problems for the settlement and the agricultural areas.
Part of wider plan
1
Policy target
Target purpose
Runoff control
Pollutants Removal
Groundwater Recharge
Policy pressure
Pressure directive Relevant pressure
Policy area
Policy area type Policy area focus Name Comments
Policy impact
Impact directive Relevant impact
Policy wider plan
Wider plan type Wider plan focus Name Comments
Implementation of the WFD
Policy requirement directive
Requirement directive Specification
Costs investment
3667000
Costs investment information
Present value of the project 5% dc rate 30 year period, 2008 € exchange rate
Costs capital
3730000
Costs capital information
Project calculations include the estimated cost reduction in operational costs
Costs land acquisition
145000
Costs land acquisition unit
€ (total value)
Costs land acquisition information
Land value is part of the capital cost, cc 5ha was purchased
Costs operation maintenance
There are cost savings due to forgone pumping cost 88.800€ (NPV, 5%, 30 year lifespan)
Costs operational
25400
Costs operational information
The NPV of total maintenance cost 57.100€, but there is a forgone cost of desludging 31.700€
Information on Ecosystem improved biodiversity
Ecological status †“ fish population from Tisza re-appeared in previously unreachable sections
Information on increased water storage
Measures impact on groundwater is positive, there are enhanced possibility of infiltration at the retention pond .
The reason of applying a closed culvert (among other aspects) across the settlement was the protection of groundwater, because an open watercourse would drain the groundwater at low water periods.
Information on runoff reduction
Runoff is attenuated by the detention pond upstream the settlement. The flow inside the settlement is controlled by the capacity increase of the crossing culvert.
Information on Peak flow rate reduction
Peak flow is reduced to the capacity of the detention pond, while other part of the catchment no runoff attenuation developments were made the emphasis was given to the storage areas
Information on Maintenance baseflow
yes
Information on Soil moisture
Detention ponds and storage areas will increase infiltration, but only very local effect
Information on Water quality overall improvements
The detention pond above the settlement will serve as a reserve for dilution when water quality problems arise due to low water quantities in the stream. (The effluent of the town†™s treatment plant discharges into the stream)
Information on Soil quality overall soil improvements
neutral, no change