Table 1
Description of the sampling stations.
| River | Station | Geographic coordinates | Main type of impacts |
|---|---|---|---|
| Affon River | Upstream 1 | 09°51"21"N ; 01°32"34"E | – |
| Upstream 2 | 09°52"39"N ; 01°31"00"E | – | |
| Urban 1 | 09°52"47"N ; 01°30‘88"E | Deposit of wastewater from vehicles washing and industrial unit | |
| Urban 2 | 09°53’88"N ; 01°47"47"E | Domestic, market and industrial unit wastewater discharge; storm water and laundering | |
| Downstream 1 | 09°57"53"N ; 01°51"42"E | Bathing and fishing | |
| Downstream 2 | 09°56"57"N ; 01°50"53"E | Downstream of the pollution sources | |
| Klou River | Upstream 1 | 08°07"20"N ; 02°08"01"E | – |
| Upstream 2 | 08°00"83"N ; 02°06"91"E | – | |
| Urban 1 | 07°53"25"N ; 02°06"04"E | Discharge of effluent from the plant | |
| Urban 2 | 07°53"24"N ; 02°06"18"E | Discharge of effluent from the plant | |
| Downstream 1 | 07°53"19"N ; 02°05"99"E | Downstream of the effluent ; no human activity | |
| Downstream 2 | 07°53"24"N ; 02°06"16"E | Downstream of the effluent ; no human activity | |
| Okpara River | Upstream 1 | 09°16"90"N ; 02°44"24"E | – |
| Upstream 2 | 09°16"91"N ; 02°44"25"E | – | |
| Urban 1 | 09°19"29"N ; 02°38"19"E | Deposit of wastewater from houses, vehicles washing, market and industrial unit and storm water | |
| Urban 2 | 09°19"45"N ; 02°38"26"E | Domestic and industrial units and wastewater discharge | |
| Downstream 1 | 09°19"80"N ; 02°37"72"E | Downstream of the effluent ; no human activity | |
| Downstream 2 | 09°20"68"N ; 02°38"86"E | Sand dredging | |
| Donga River | Upstream 1 | 09°42"53"N ; 01°58"54"E | – |
| Upstream 2 | 09°42"54"N ; 01°09"21"E | – | |
| Urban 1 | 09°43"40"N ; 01°40"32"E | Deposit of wastewater from vehicles washing and wastewater | |
| Urban 2 | 09°42"53"N ; 01°58"54"E | Market and industrial unit wastewater discharge; Storm water and laundering | |
| Downstream 1 | 09°42"54"N ; 01°09"21"E | Downstream of the pollution sources | |
| Downstream 2 | 09°43"40"N ; 01°40"32"E | Sand dredging | |
| Ouémé River | Upstream 1 | 08°00"23”N ; 2°22"39”E | – |
| Upstream 2 | 08°00"22"N ; 2°22"38"E | – | |
| Urban 1 | 08°03"38"N ; 2°22"33"E | Deposit of industrial wastewater | |
| Urban 2 | 08°03"39”N ; 2°22"34"E | Deposit of industrial wastewater | |
| Downstream 1 | 08°04"28”N ; 2°22"13"E | Downstream of the effluent; no human activity | |
| Downstream 2 | 08°04"27”N ; 2°22"12"E | Bathing and fishing |
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