The Comprehensive Study on Riverine Inputs and Direct Discharges (RID) aims to assess the input of selected contaminants to the OSPAR maritime area and its regions which are carried via rivers into tidal waters or are discharged directly into the sea (for example through sewage pipelines or activities like aquaculture applying substances directly in the sea). The RID Study currently focusses on mandatory monitoring and reporting of the concentrations and loads of the metals cadmium, copper, lead, mercury and zinc, the organic pollutant lindane, nitrogen and phosphorus species and suspended particulate matter. Monitoring of PAHs, mineral oil, PCBs and other hazardous substances, especially organohalogens, are recommended for voluntary monitoring.

The detailed monitoring commitments of Contracting Parties are set out in the RID principles. Monitoring and reporting is co-ordinated through adherence to jointly agreed guidance, including the JAMP guidelines for the estimation of riverine inputs of PAHs.

The data annually reported under the RID Study are evaluated and published by OSPAR in yearly RID data reports. All data collected under the RID Study are assessed on a regular basis at OSPAR level. This follows agreed procedures set out in the JAMP guidance on input trend assessment and the adjustment of loads and agreed statistical methods. The most recent scientific assessment of long-term trends in riverine inputs and direct discharges of hazardous pollutants to the OSPAR maritime area is the 2005 RID data assessment.

The recommended methods for trend assessment of RID data require the use of software applications such as RTrend. This software and the user manual can be downloaded here by OSPAR delegates. Username and password for the download and the documentation of the software can be obtained on application to the Secretariat.