Table 1.

The selected sampling sites from the two rivers and their designation.

S N.	Name of the site	Coordinates	Characteristics
1	HR1	9°03'58.75 N and 38°30'56.38” E	The outlet at which the wastewater discharging from the Oromia wanders flower farm flows to Holeta River
2	HR2	9°03'58.23” N and 38°30'45.06”E	In the channel in which the wastewater flows from the Oromia wanders the flower farm drain before being mixed with Holeta River water 100 m from HR1.
3	HR3	9°04'09.03” N and 38°30'36.03”E	The site selected from Holeta River after effluent from the Oromia wanders flower farm joined the river 200 m from the joining site.
4	HR4	9°03'53.79”N and 38°30'39.05” E	The site was selected from Holeta River before the effluent from the Oromia wanders flower farm joined the river.
5	GR1	9°03'17.81”N and 38°27'20.07” E	The outlet at which the wastewater discharged from Euro flora flower farms flows to the Golli River.
6	GR2	9°03'18.93”N and 38°27'18.32 E	In the channel that drains the wastewater discharging from Ethio-dream and Euro flora flower farms before mixed with the Golli River on 200 m from GR1
7	GR3	9°03'39.46N and 38°27'21.59” E	The site was selected from the Golli River after the effluents from Ethio-dream and Euro flora flower farms mixed with the river 500 m from the joining site.
8	GR4	9°03'08.85”N and 38°27'19.73”E	The site was selected from Golli River before the wastewater discharged from the flower farms joined the river