Table 2 Overview of the reference and sampling sites at the rivers Nidda, Usa, and Horloff
Sampling site | Latitude [N] | Longitude [E] | Characteristics |
|---|---|---|---|
Nidda | |||
N1 | 50°27′11″ | 9°02′53″ | Reference site without any upstream dischargers/effluents; downstream of the Nidda river dam, surrounded by intensive agriculture |
N2 | 50°19′41″ | 8°52′32″ | Downstream of two WWTPs (35,000 and 7500 PE) and a paper mill, surrounded by intensive agriculture |
N3 | 50°19′08″ | 8°51′28″ | Downstream of the mouth of the tributary Horloff, within the city Nieder-Flortstadt |
N4 | 50°16′42″ | 8°47′08″ | Downstream of two WTTPs (30,000 and 12,000 PE), within restored area from 2001, surrounded by intensive agriculture |
Usa | |||
U1 | 50°19′01″ | 8°31′26″ | Reference site without any upstream dischargers/effluents, surrounded by intensive agriculture |
U2 | 50°22′48″ | 8°42′45″ | Downstream of a WWTP (49,000 PE), surrounded by garden plots |
U3 | 50°21′32″ | 8°44′39″ | Within restored area from 2010, within the city Bad Nauheim |
U4 | 50°20′09″ | 8°46′16″ | Downstream of a WWTP (43,800 PE) and discharges from public baths, surrounded by intensive agriculture and garden plots |
Horloff | |||
H1 | 50°31′12″ | 9°02′36″ | Reference site without any upstream dischargers/effluents, surrounded by forests and some cottages |
H2 | 50°30′52″ | 8°57′00″ | Downstream of four small-sized WWTPs (< 1000 PE), surrounded by intensive agriculture |
H3 | 50°24′41″ | 8°54′02″ | Downstream of one WWTP (78,000 PE), surrounded by intensive agriculture |
H4 | 50°23′57″ | 8°53′56″ | Within restored area from 2006/2007, surrounded by intensive agriculture |