Inventory of emissions, discharges and losses
23.—(1) The Department must continue to maintain an inventory, including maps if available, of emissions, discharges and losses of all substances and pollutants listed in Table 47 of Part 2 of Schedule 1 for each river basin district or part of a river basin district, including their concentrations in sediment and biota, as appropriate.
(2) The Department must continue to update the inventories as part of the review of the analyses specified in Article 5(2) of the Water Framework Directive, and must publish the updated inventories in the corresponding river basin management plan.
(3) The reference period for the establishment of values in the inventories referred to in paragraph 1 must be the year before that analysis is to be completed, with the exception of priority substances or pollutants covered by Directive 91/414/EEC, where the entries may be calculated as the average of the three years before the completion of that analysis.