River Basins Cardiff East District Long Outfall
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Severn Lower at Cardiff East District Long Outfall

This is a sewage discharge monitoring station, which is usually a type of Event Duration Monitor (EDM).
These stations themselves are designed to mitigate the impact of heavy rainfall by discharging, under permitted conditions, any overflow into a water body. They are often actively discharging during flood events.
This page presents the data acquired by the monitoring system for this discharge station.
Operational Summary - 2021-2023
Severn Lower | 257 Spills |
2537.2 hours | 9.65


The declared body of water receiving this discharge is the "Severn Lower"
This station has discharged sewage 257 time(s).
The station has discharged for a total of 2537.2 hour(s).
This is 9.65% of the time which we have data for.
In total: 105 day(s)* of elapsed time.

99 | 262.8 hours
This monitor has been operational for 99% of its total time we have data for.
There are 262.8 hours unaccounted for due to downtime of the monitor.


The worst year in our records for the "Cardiff East District Long Outfall" is 2023, discharging sewage for 1205.5 hours of the year.

Uptimes below 90% (red line) should be accompanied by a reason
*This is total time in days, not individual days.
Yearly Summary
Most Recent Year - 2023
Severn Lower | 127 Spills |
1205.5 hours | 13.76

The declared body of water receiving this discharge is the "Severn Lower"
This station discharged sewage 127 time(s) during 2023.
The station discharged for a total of 1205.5 hour(s).
This is around 50 day(s)* or 13.76% of the year.

99.9 | 2.6 hours
This monitor was operational for 99.9% of the year.
Leaving 2.6 hours unaccounted for in the data.


*This is total time in days, not individual days of the year.

Permit & Governance

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #AN0308501
Secondary Permit #AN0308501

2022
Severn Lower | 59 Spills |
621 hours | 7.08

The declared body of water receiving this discharge is the "Severn Lower"
This station discharged sewage 59 time(s) during 2022.
The station discharged for a total of 621 hour(s).
This is around 25 day(s)* or 7.08% of the year.

99.9 | 1.7 hours
This monitor was operational for 99.9% of the year.
Leaving 1.7 hours unaccounted for in the data.


*This is total time in days, not individual days of the year.

Permit & Governance

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #AN0308501
Secondary Permit #AN0308501

2021
Unnamed Trib - Source To Conf Rhymney R | 71 Spills |
710.7 hours | 8.11

The declared body of water receiving this discharge is the " Unnamed Trib - Source To Conf Rhymney R"
This station discharged sewage 71 time(s) during 2021.
The station discharged for a total of 710.7 hour(s).
This is around 29 day(s)* or 8.11% of the year.

99.8 | 13.1 hours
This monitor was operational for 99.8% of the year.
Leaving 13.1 hours unaccounted for in the data.


*This is total time in days, not individual days of the year.

Permit & Governance

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #AN0308501
Secondary Permit #AN0308501


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Local Information
Station Data Information
Station overseen (meaning either provided, or regulated) by: Natural Resources Wales
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