The total population (Central Statistics Office data for 2006) and the percentage of it connected to a sewer system differs between the municipalities: Goleniów (33 289, 76%), Stepnica (4,770, 66%), Dziwnów (4,127, 95%), Kamień Pomorski (14 664, 59%), Międzyzdroje (6,449, 90%), Wolin (12 475, 43%), Nowe Warpno (1,605, 61%), Police (41 099,

80%), Świnoujście (40 688, 93%) and Szczecin (401 437, 89%). In 2006, 65% of the sewage was treated BKM120 purchase biologically/chemically while 27% of Szczecin’s effluents were still treated mechanically and 8% of the water even went untreated (Council of Ministers Republic of Poland, 2008). In 2010 the amendment of the Polish Water Law was published. It defines objectives, instruments,

procedures, institutional actors of the water administration, implemented the new EU Bathing Water Quality Directive (2006/7/EC) and modified some responsibilities. Today, bathing sites are managed on a local level by administrators or the communities and the Sanitary Inspection takes care of bathing water monitoring and the compliance of water quality with Directive (2006/7/EC). Selleck isocitrate dehydrogenase inhibitor In the following we focus on E. coli and Enterococci bacteria because they are the new indicators in this Directive and in 2011 replace coliform bacteria in the monitoring programme. One of the crucial element in the new EU Bathing Water Directive are bathing water profiles. Their aim is to provide the public and authorities with information about physical, geographical and hydrological characteristics of a bathing places as well as possible pollution sources impacting bathing water quality. In this study we apply the General Estuarine Transport Fludarabine in vitro Model (GETM, Burchard and Bolding, 2002 and Burchard, 2009. This 3D-flow model allows reliable and spatially high resolved flow and transport simulations in shallow systems with a complex bathymetry and coastline. It was successfully applied and validated in recent studies (see e.g. Burchard et al., 2005, Lettmann et al., 2009,

Hofmeister et al., 2011 and Gräwe and Burchard, 2011). The model allows coastal areas to be flooded and to fall dry at low water levels. Wave dynamics is not taken into account. Basis for the flow calculation is a curvilinear grid that reflects the coastline and the bathymetry of the estuary. The horizontal spatial grid resolution varies between 15 m in the southern Odra mouth (our focus region) and 200 m in the Pomeranian Bight. The vertical water column is always subdivided into 10 layers with a similar thickness (sigma levels). The whole area covered by the model-grid (domain) contains 800 *1300*10 (x,y,z) grid points (see Fig. 1). To compute 2D variables like (e.g. sea surface elevation), a time step of 0.4 s is used. To compute the 3D variables (temperature, salt and flow) a time step of 480 s is chosen. The output fields are stored on an hourly basis.