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Table 1 Overview of sampling sites in the Nidda catchment area, including the evaluation based on obtained significances

From: The importance of sediments in ecological quality assessment of stream headwaters: embryotoxicity along the Nidda River and its tributaries in Central Hesse, Germany

Sampling code Coordinates Description Significances (%) Category
 N1 50°27′11″N 9°02′20″E Reference site; downstream the Nidda river dam 37.5 Poor
  N2.1 50°26′40″N 9°01′57″E Directly downstream the point of efflux of the industrial discharger 26.7 Moderate
  N2.2 50°26′36″N 9°01′47″E Approximately 250 m downstream of N2.1 40.0 Poor
  N2.3 50°26′29″N 9°01′43″E Approximately 500 m downstream of N2.1 40.0 Poor
  N2.4 50°26′26″N 9°01′34″E Approximately 700 m downstream of N2.1 20.0 Moderate
 N2 50°25′51″N 9°01′20″E Downstream an industrial discharger 45.0 Poor
 N3 50°23′09″N 8°58′25″E Downstream a class-IV WWTP (35,000 pe) 45.0 Poor
 N4 50°19′41″N 8°52′32″E Downstream a class-III WWTP (7500 pe) 10.0 Good
 N5 50°19′08″N 8°51′28″E Downstream the afflux of the tributary Horloff 10.0 Good
 N6 50°16′42″N 8°47′08″E Downstream a class-IV WWTP (30,000 pe), a class-III WWTP (7000 pe), four renaturalised river sections and the afflux of the Usa/Wetter tributary 0.0 Very good
 H1 50°31′12″N 9°02′36″E Reference site; no direct dischargers upstream 36.7 Poor
 H2 50°30′52″N 8°57′00″E Downstream several class-I WWTPs (< 1000 pe) 41.7 Poor
  H2.1 50°30′42″N 8°56′42″E Approximately 500 m downstream of H2 46.7 Poor
  H2.2 50°30′37″N 8°56′33″E Approximately 750 m downstream of H2 26.7 Moderate
  H2.3 50°30′18″N 8°56′24″E Approximately 1400 m downstream of H2 40.0 Poor
  H2a oh 50°26′22″N 8°53′58″E Upstream a class-IV WWTP 46.7 Poor
  H2a uh1 50°26′15″N 8°53′53″E Directly downstream the point of discharge of the class-IV WWTP (78,000 pe) 26.7 Moderate
  H2a uh2 50°26′05″N 8°53′48″E Approximately 350 m downstream H2a uh1 60.0 Very poor
  H2a uh3 50°24′52″N 8°54′10″E Approximately 2650 m downstream H2a uh1, following a conservation area 53.3 Poor
  H2a uh4 50°24′40″N 8°54′01″E Approximately 3000 m downstream H2a uh1 40.0 Poor
 H3 50°24′49″N 8°54′09″E Downstream the class-IV WWTP (78,000 pe) 40.0 Poor
 H4 50°23′57″N 8°53′56″E Between two renaturalised river sections 25.0 Moderate
 U1 50°19′01″N 8°31′26″E Reference site; no direct discharger upstream 20.0 Moderate
 U2 50°22′48″N 8°42′45″E Downstream a class-IV WWTP (50,000 pe) 20.0 Moderate
 U3 50°21′32″N 8°44′39″E Within a renaturalised area in the city centre of Bad Nauheim 30.0 Moderate
 U4 50°20′09″N 8°46′16″E Downstream two class-IV WWTPs (43,800/47,500 pe), and (medical) spa water discharges 15.0 Good
  1. With regard to the classification scheme of the Water Framework Directive (WFD) for the ecological condition of surface waters, a five class system derived. Percent limits were set by the authors. Categories apply as followed: very good 0% significances, good ≤ 15% significances, moderate ≤ 30% significances, poor ≤ 50% significances, very poor > 50% significances. An endpoint would be regarded as significant if at least two out of three runs showed statistically significant differences for a single endpoint. Those significances were summed up and related to the maximum number of significances possible for one sampling site. Main sampling sites are marked in italics
  2. WWTP waste water treatment plant, pe people equivalents