The water quality is an important parameter for the survival of the mussels in the Luxemburgish Ardennen.
635 samples of the rivers, streams and springs were measured in the period between February 2015 to February 2016 - 120 samples of river Our and Sûre, 115 samples of tributary mouths and 300 samples of springs. 100 samples were analysed from points where restoration measures took place, new or interesting points.
Table 1 below gives an overview of some water parameters from the river Our and Sûre, given as annual mean.
Table 1: Annual mean of several water parameters from the river Our and Sûre 2015
|
Parameter
|
Our (Kalbermillen)
Annual mean
|
Sûre/ Moulin de Bigonville
Annual mean
|
|
Discharge [m³/s]
|
5,9 (Ouren)
|
4,1 (Bigonville)
|
|
Water temperature [°C]
|
10,3
|
10,4
|
|
Conductivity [µS/cm]
|
150
|
155
|
|
Turbidity [FNU]
|
5,6
|
7,9
|
|
Nitrate [mg/L]
|
13,0
|
13,4
|
|
nitrite [mg/L]
|
0,04
|
0,05
|
|
ammonium [mg/L]
|
0,05
|
0,08
|
|
chloride [mg/L]
|
17,4
|
19,7
|
In the following graphs the development of the parameters debit resp. height, conductivity, turbidity, nitrate, rain, pH, oxygen and water temperature are shown of river Our and Sure.