This dataset contains disposal sites reported by HELCOM Contracting Parties, according to the HELCOM Recommendation 36/2 ( https://helcom.fi/action-areas/industrial-municipal-releases/dredging/). The disposal sites are grouped by spatial data type to pointwise, line and polygon datasets. Data covers the years 2006-2022.

The data format is defined in the HELCOM Guidelines for management of dredged material at sea ( https://helcom.fi/action-areas/industrial-municipal-releases/dredging/).

Attribute information (heading for downloadable shapefile):

Helcom site ID (Helcom_sit): Unique id for deposit site

Dredging ID (Dredging_I): Dredging site id, where material originates from

Unique ID (Unique_ID): Unique id for each depositing activity (Helcom site ID + Dredging ID + year)

Site name (Site_name): Name of the deposit site

Type of area dredged (Type_of_ar): Type of area that was dredged (e.g. harbour or sea)

Dredging activity (Dredging_a): Maintenance or capital dredging

Material deposited (Material_d): The type of material deposited (e.g. sand, silt)

Amount deposited (tonnes) (Amount_dep): Amount of material that has been deposited to deposit site, tonnes dry weight

Amount beneficial use (tonnes) (Amount_ben): Amount material used for beneficial purposes, tonnes dry weight

Beneficial use (Beneficial): Description of beneficial use

Year (Year): Year of activity

Country (Country): Contracting Party of HELCOM

Sub-basin (Sub_basin): HELCOM sub-basin (assessment unit level 2) where activity has taken place

Comments (Comments): General comments related to activity

Contaminants Cd - SPAH9: Amount of contaminant deposited, in tonnes dry weight

Contaminants SPCB7 - MBT : Amount of contaminant deposited, in kilograms dry weight

Other contaminants (kg) (Other_cont): Any other contaminant deposited (substance indicated in "notes")

Petroleum HC (tonnes) (Petroleum_): Amount of Petroleum HC deposited, in tonnes dry weight

HCB - DEHP DBP BBP: Amount of contaminant deposited, in kilograms dry weight

Contaminant notes (Contaminan): Notes related to contaminant load

Permit (Permit): Deposit site permit reference

Quality flag (Quality_fl): Quality flag of data

- Quality assured: Data is quality assured either in the annual verification or in a separate quality assurance process by EN DREDS

- No quality assurance: Data is not quality assured due to the reason that process has not been carried out

- No Quality assurance possible: Data quality assurance process has been made, but it was not possible to find the reference data to verify the parameters