Water quality assessment in the “German River of the years 2014/2015”: how a case study on the impact of a storm water sedimentation basin displayed impairment of fish health in the Argen River (Southern Germany)

Environmental Sciences Europe

Table 2 Physicochemical data of sampling events 1 and 2

	U1	SSB effluent 1	D1	U2	SSB effluent 2	D2
Conductivity (µs/cm)	451	720	540	475	765	509
Water temperature (°C)	13.9**	12.1	13.6**	18.7*	13.6	18.2*
O₂ saturation (%)	113.5	111	120	116	118.2	111.7
O₂ content (mg/L)	10.92**	11	11.6**	9.94**	11.31	9.83**
NH₄–N (mg/L)	0.06*	–	<0.04**	<0.04**	<0.04	<0.04**
NO–N (mg/L)	0.012	–	0.01	0.007	0.01	0.006
NO–N (mg/)L	0.7	–	0.9	0.9	3.8	1.1
PO–P (mg/L)	<0.05*	–	<0.05*	<0.05*	<0.05	<0.05*
Carbonate hardness (°dH)	16	–	15	19	–	19
Overall hardness (°dH)	15	–	16	20	–	20
pH	8.5*	–	8.5*	8.2*	7.95	8.1*
Chloride (mg/L)	11**	–	19**	13**	70	17**

Values were evaluated and assessed according to the guidance values defined by LAWA (German Working Group for Water Issues; LUBW [18]) and the German Regulation Act for Surface Waters of 2011 (OGewV [16])
Values marked with two asterisks (**) point to very good ecological conditions; values marked with one asterisk (*) point to ecological conditions that are at least good