Restoration of the Cerny Potok stream, Czech-Republic

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.

The in-depth description of the case study:

cs-cz-01-final_version.pdf

NUTS Code:

Severozápad

RBD code:

CZ_5000

Transboundary:

Data provider:

Jovanka Ignjatovic, REC

Source(s):

Ecological restoration in Czech Republic

NWRM(s) implemented in the case study:

Stream bed re-naturalization

Longitude:

13.8905

Latitude:

50.734

Site information

Climate zone:

cool temperate dry

Mean rainfall:

850

Mean rainfall unit:

mm/year

Average temperature:

Mean runoff:

0,0240000002086163

Mean runoff unit:

600 - 750 mm

Average runoff coefficient:

0,25

Type:

Case Study Info

Light or indepth?:

In-depth

Average slope range:

2-5%

Vegetation class:

Grassland

Monitoring maintenance

Monitoring impacts effects:

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

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°):

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

Lessons, risks, implications...

Key lessons:

The successful implementation was enabled by good collaboration between investor, designer and subcontractors

Success factor(s):

Type	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:

Type	Comments
Other	Free State of Saxony, Operational Programme Environment

Barrier:

Type	Role	Comments
Other	main barrier	there is a rather good scientifc and practical knowledge of how to restore various disturbed habitats preferably in near-natural ways. However, there are still many obstacles to applying this knowledge in practice, ofen due to low interest by target companies, offcials, decisionmakers, and sometimes due to inconvenient legislation.

Driver:

Type	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

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:

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:

Information on Ecosystem provisioning services:

It is not relevant for this application

Ecosystem water supply:

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

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:

Policy pressure:

Policy requirement directive:

Policy impact:

Policy wider plan:

Policy area:

Policy target:

Target purpose
Improved Biodiversity
Runoff control
Groundwater Recharge

Design & implementations

Application scale:

Field Scale

Installation date:

2010-02

Lifespan:

Age:

Performance timescale:

1 - 4 years

Area (ha):

7,40000009536743

Area subject to Land use change or Management/Practice change (ha):

7,40000009536743

Size:

Size unit:

Design capacity unit:

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:

Design contractual arrangement:

Design consultation activity:

Activity stage	Name	Key issues	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:

Design authority:

Authority type	Role	Name	Comments
Other	Initiation of the measure	Nature Conservation Agency of the Czech Republic	Nature Conservation authority
Other	Monitoring	Czech Union for Nature Conservation	National association
Other	Monitoring	Local Chapter Teplice †“ Fergunna	CUNC Teplice is one of hundreds of the Czech Union for Nature Conservation, which operates throughout the Czech Republic. A new activity of this organization is to create a basic land league (PS) Fergunna, whose main objective is the protection of nature and landscape of the Ore Mountains.

Last updated: 23 Jun 2015 | Top

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Restoration of the Cerny Potok stream, Czech-Republic

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