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. Light or indepth? Light NUTS Code Latvija Transboundary 0 Data provider Kristina Veidemane, BEF Source(s) Metodes un tehnoloÄ£ijas meža kapitÄlvÄ“rtÄ«bas palielinÄšanai NWRM(s) implemented in the case study Sediment capture ponds Site information Climate zone cool temperate moist Type Actual Test Site Monitoring maintenance Monitoring impacts effects 1 Monitoring location In-Stream Administrative annual cost information The monitoring of effectiveness of the measure has been carried out as a research project. 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 Other Other Latvian State Forests State owned forest company which all roles Other Monitoring Latvian State Forest Research Institute "Silava" State research institute on forest issues 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. Barrier Barrier type Barrier role Comments Expected maintenance needs main barrier The sediment capture ponds should be cleaned annualy Other main barrier The existing monitoring results does not demonstrate clear effectiveness of the measure as it is implemented at the moment 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 Full Context Collection(aka Doorway or Gallery) Case Studies Pathway(aka Context) Default view Area(aka Level or Site) ALL