General
National Id
Latvia_02
Site name
three sites in Latvia (2 in West Vidzeme and 1 in Kurzeme)
Summary
During last years the construction of the sediment capture ponds as a part of the drainage system has become a good practice measure in the forests managed by Latvian State Forests, therefore some of the environmental impacts of this measures has been monitored to justify its costs. The results indicate differences between monitoring sites set up on mineral or peatland soils as well as between different measured parameters. Additionally, it seems that the effectiveness of the measure depends on the skills and quality of the work carried out by professionals constructing the ponds.
NUTS Code
Latvija
Transboundary
0
Data provider
Kristina Veidemane, BEF
NWRM(s) implemented in the case study
Site information
Climate zone
cool temperate moist
Type
Actual Test Site
Light or indepth?
Light
Monitoring maintenance
Monitoring impacts effects
1
Monitoring location
In-Stream
Monitoring parameters
water quality
Monitoring upstream station
samples were take before the sedimentation pond
Monitoring downstream station
samples wer taken after the sedimentation pond
Performance
Performance impact estimation method
Catchment outlet
Performance impact estimation information
assessment of water quality
Design & implementations
Application scale
Plot
Lifespan
10
Age
2
Performance timescale
< 1 year
Area (ha)
272
Design capacity
50
Design capacity unit
m
Constraints
Functioning of sediment capture ponds depends on the skill of the professionals who construct it.
Public consultation
0
Contractural arrangements
0
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 | |
|---|---|---|---|---|---|
Lessons, risks, implications...
Key lessons
The measures to build sedimentation ponds in forest drainage systems have been implemented in Latvia; however their impact on the water quality has not been evaluated. The case study presents the research results of monitoring of impact on water quality due to installation of the sedimentation pond. The results indicate that the values differ between the years of installement. It is importan that the ponds are installed that the river water can not be flow into the draianage system as well the ponds should be cleaned annually.
Financing mechanism
0
Financing difficulties
0
financing funding solutions
The measure is included as one of the activities carried out for renovation of the drainage system.
Success factor(s)
| Success factor type | Success factor role | Comments | |
|---|---|---|---|
|
Attitude of relevant stakeholders
|
The sediment capture ponds are promoted by NGOs and some scientific literature, therefore if the monitoring results in upcomong years will be convincing then the measure could be continued. |
Financing
| Financing type | Comments | |
|---|---|---|
|
Other
|
The "Latvian State Forests" is state owned company. The measure is a part of renovation and maintenance activities of the drainage system.
|
Driver
| Driver type | Driver role | Comments | |
|---|---|---|---|
|
Organisation committed to it
|
main driver
|
"Latvian State Forests" has introduced this measure as good management practice
|
|
|
Public pressure
|
secondary driver
|
NGOs are concerned about the impact of drainage systems on water and fish resources
|
Financing share
| Financing share type | Share | Comments |
|---|
Policy, general governance and design targets
Policy description
to prevent erosion and nutrient leackage by reducing stream velocity
Part of wider plan
0
Policy target
| Target purpose | |
|---|---|
|
Pollutants Removal
|
|
|
Erosion Control
|
Policy pressure
| Pressure directive | Relevant pressure |
|---|
Policy area
| Policy area type | Policy area focus | Name | Comments |
|---|
Policy impact
| Impact directive | Relevant impact | |
|---|---|---|
|
WFD identified impact
|
Policy wider plan
| Wider plan type | Wider plan focus | Name | Comments |
|---|
Policy requirement directive
| Requirement directive | Specification |
|---|
Socio-economic
Costs investment information
the sediment capture ponds are built when the drainage systems are renovated, therefore the direct costs related to sediment ponds are unknown.
Costs operation maintenance
the ponds shall be cleaned annually
Ecosystem improved biodiversity
0
Ecosystem provisioning services
0
Ecosystem water supply
0
Ecosystem impact climate regulation
No specific impact
Biophysical impacts
Water quality overall improvements
Neutral impact-no change in WQ status
Information on Water quality overall improvements
The monitoring results of 2012/2013 differ among sites, and also among chemical elements
Information on Water quality Improvements (P)
The change in P-PO4 (3+) concentrations is different between the sites - some locations show increase, some decreased and in some no change between inlet and outlet of the sedimentation pond.
Information on Water quality Improvements (N)
The change in total N concentrations is different between the sites - some locations show increase, some decreased when the concentrations between inlet and outlet of the sedimentation pond.
Water quality Improvements (TSS)
The change in TSS is different between the sites - some locations show increase, some decreased when the consentrations between inlet and outlet of the sedimentation pond.
Soil quality overall soil improvements
Neutral impact-no change in SQ status
