General
National Id
Czech_02
Site name
ČernýPotok stream
Summary
The Nature Conservation Agency of the Czech Republic carried out the retoration of Cerny Potok stream which was based on common principles of stream restoration. The main aim of the restoration was to decrease the volume of the restored stream-beds especially by reducing their depth. Modifications within the channelized stream-bed were not sufficient, therefore new stream-beds were proposed and constructed. They were reconnected with the remains of the original stream course or directed freely to the alluvial meadows.
Light or indepth?
In-depth
The in-depth description of the case study
NUTS Code
Severozápad
RBD code
CZ_5000
Transboundary
0
Data provider
Jovanka Ignjatovic, REC
Source(s)
NWRM(s) implemented in the case study
Longitude
13.8905
Latitude
50.734
Site information
Climate zone
cool temperate dry
Mean rainfall
850
Mean rainfall unit
mm/year
Average temperature
10
Mean runoff
0,0240000002086163
Mean runoff unit
600 - 750 mm
Average runoff coefficient
0,25
Type
Case Study Info
Average slope range
2-5%
Vegetation class
Grassland
Monitoring maintenance
Monitoring impacts effects
1
Monitoring location
Edge of Field/Plot
Monitoring parameters
Biodiversity,flow velocity, kind and quantity of sediments and graphic cross section profiles
Performance
Performance impact estimation method
Catchment outlet
Performance impact estimation information
The two dimensional hydrodynamic SRH-2D model
Design & implementations
Application scale
Field Scale
Installation date
2010-02
Lifespan
50
Age
4
Performance timescale
1 - 4 years
Area (ha)
7,40000009536743
Area subject to Land use change or Management/Practice change (ha)
7,40000009536743
Size
4
Size unit
km
Design capacity unit
m2
Design capacity description
Pools with marshes, 9630 m2
Basis of design
Natural overflow in case of Q100 foods (along meandering segment in the alluvium) 74000 m2
Constraints
The works would have to be conducted out of the nesting season of birds and metamorphosis of amphibians.
Favourable preconditions
part of Natura 2000 network
Inflow volume
31,7000007629395
Inflow volume unit
m3/sec
Public consultation
1
Design contractual arrangement
| Arrangement type | Responsibility | Role | Comments | Name |
|---|
Design consultation activity
| Activity stage | Key issues | Name | Comments |
|---|---|---|---|
|
Design phase
|
NGOs were involved in the restoration project. Members of the Czech Union for Nature Conservation (Local Chapter Teplice †“ Fergunna) participated in study, project preparation and implementation.
|
||
|
Implementation phase
|
The restored site is used for education, and both experts and the public from the Czech Republic and abroad have visited it.
|
Design land use change
| Land use change type |
|---|
Design authority
| Authority type | Role | Responsibility | Name | Comments |
|---|---|---|---|---|
Lessons, risks, implications...
Key lessons
The successful implementation was enabled by good collaboration between investor, designer and subcontractors
Success factor(s)
| Success factor type | Success factor role | Comments |
|---|---|---|
|
Specific incentives for stakeholder involvement
|
main factor
|
New methods were applied in the design of shape and course of the streambed, and their successful implementation was enabled by good collaboration between investor, designer and subcontractors. |
|
Specific incentives for stakeholder involvement
|
secondary factor
|
good cooperation with stakeholders |
Financing
| Financing type | Comments |
|---|---|
|
Other
|
Free State of Saxony, Operational Programme Environment
|
Driver
| Driver type | Driver role | Comments |
|---|---|---|
|
Past flooding events
|
main driver
|
Restoration of streams and their floodplains
|
|
Balancing different objectives
|
secondary driver
|
Restoration of other wetlands in the landscape
|
Financing share
| Financing share type | Share | Comments |
|---|
Policy, general governance and design targets
Policy description
Gradual degradation coused by surface drainage and peat cutting in the headwater peatbog.
Part of wider plan
0
Policy target
| Target purpose |
|---|
|
Improved Biodiversity
|
|
Runoff control
|
|
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 |
|---|
Policy requirement directive
| Requirement directive | Specification |
|---|
Socio-economic
Direct benefits information
The efect of restoration on the flow rate and delays of the flood waves, as well as on local fauna and fora was monitored as well (Nature Conservation Agency of the Czech Republic, Czech Union for Nature Conservation, Local Chapter Teplice- Fergunna 2007-2011) but only preliminary results are available at present because of a relatively short post-restoration phase.
Ancillary benefits information
The effect of restoration on the flow rate and delays of the flood waves, as well as on local fauna and fora was monitored as well (Nature Conservation Agency of the Czech Republic, Czech Union for Nature Conservation, Local Chapter Teplice - Fergunna, 2007-2011) but only preliminary results are available at present because of a relatively short post-restoration phase.
Costs investment
316000
Costs investment information
2001-2003: €52,000; 2008-2010: €264,000
Costs operation maintenance
N/A info
Costs total
316000
Costs total information
2001†“2003: €52,000; 2008†“2010: €264,000
Ecosystem improved biodiversity
1
Information on Ecosystem improved biodiversity
Already at time of construction it was possible to observe viviparous lizard and the insects 'jumpers' in the pools. Bird species of lapwings (Vanellus vanellus) and the common snipe Gallinago gallinago.
Ecosystem provisioning services
0
Information on Ecosystem provisioning services
It is not relevant for this application
Ecosystem water supply
0
Information on Ecosystem water supply
It is not relevant for this application
Ecosystem impact climate regulation
Not relevant for the specific application
Information on Ecosystem impact climate regulation
It is not relevant for this application
Biophysical impacts
Information on retained water
Dynamic meandering of the restored stream-bed is being studied, but long-term monitoring is necessary to obtain statistically significant results.
Information on increased water storage
In a model of a restored stream section of ca. 1 km in length, the delay was up to 2 hours for the 1-year flood compared to the regulated stream and a considerable 20 minutes for a 100-year flood.
Information on runoff reduction
Very significant effect was recorded on the delay of the flood wave. As a consequence, the peak flow downstream can be reduced due to delayed peak flows from the tributaries
Peak flow rate reduction
0,0649999976158142
Peak flow rate reduction unit
m3/sec
Information on Peak flow rate reduction
Only a small effect of the stream restoration on the peak flow was found with the exception of less frequent floods (N1, N2 and N5 peak flows were reduced by only 50-80 l/sec)
Water quality overall improvements
Neutral impact-no change in WQ status
Information on Water quality overall improvements
Classified as good and very good condiions. pH = 6-8, high concentrations of dissolved oxygen.
Water quality Improvements Copper (Cu)
0,0199999995529652
Water quality Improvements (Cu) unit
mg/L
Water quality Improvements Zinc (Zn)
0,00499999988824129
Water quality Improvements (Zn) unit
mg/L
Water quality Improvements water temperature (W T°)
8
Water quality Improvements (W T°) unit
o C
Soil quality overall soil improvements
Not relevant for this application
Information on Soil quality overall soil improvements
It is not relevant for this application