The average normalized water + airborne input of nitrogen and phosphorus during 1997-2003 used to calculate CART and input ceilings. The
average annual nutrient input in the reference period is used as a baseline, or
point of reference, for calculating changes resulting from the measures taken to
Any sub-catchment(s) located downstream of the (riverine) chemical monitoring point within the catchment and further all unmonitored catchments; e.g. partly monitored rivers, unmonitored part of monitored rivers, unmonitored rivers and coastal areas including unmonitored islands.
In previous versions of the guidelines, direct diffuse sources (scattered dwellings and storm waters overflows) were reported separately and some countries also reported coastal areas separately. These are now reported as part of the unmonitored area.