River Basins Western Wales Carmarthen Bay and the Gower Loughor Gwili - headwaters to tidal limit Cwmtawel Wastewater Treatment Works Inlet Storm Overflow (CSO)
River Basins . . . Gwili - headwaters to tidal limit Cwmtawel Wastewater Treatment Works Inlet Storm Overflow (CSO)
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Gwili - Headwaters To Tidal Limit at Cwmtawel Wastewater Treatment Works Inlet Storm Overflow (CSO)

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
Gwili - Headwaters To Tidal Limit | 25 Spills |
370 hours | 1.4


The declared body of water receiving this discharge is the "Gwili - Headwaters To Tidal Limit"
This station has discharged sewage 25 time(s).
The station has discharged for a total of 370 hour(s).
This is 1.4% of the time which we have data for.
In total: 15 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 "Cwmtawel Wastewater Treatment Works Inlet Storm Overflow (CSO)" is 2023, discharging sewage for 370 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
Gwili - Headwaters To Tidal Limit | 25 Spills |
370 hours | 4.22

The declared body of water receiving this discharge is the "Gwili - Headwaters To Tidal Limit"
This station discharged sewage 25 time(s) during 2023.
The station discharged for a total of 370 hour(s).
This is around 15 day(s)* or 4.22% of the year.

99.9 | 8.7 hours
This monitor was operational for 99.9% of the year.
Leaving 8.7 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 #BP0345701
Secondary Permit #BP0345701

2022
Gwili - Headwaters To Tidal Limit | 0 Spills |
0 hours | 0

The declared body of water receiving this discharge is the "Gwili - Headwaters To Tidal Limit"
This station discharged sewage 0 time(s) during 2022.
The station discharged for a total of 0 hour(s).
This is around 0 day(s)* or 0% of the year.

99.9 | 5.2 hours
This monitor was operational for 99.9% of the year.
Leaving 5.2 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 #BP0345701
Secondary Permit #BP0345701

2021
Gwili - Headwaters To Tidal Limit | 0 Spills |
0 hours | 0

The declared body of water receiving this discharge is the "Gwili - Headwaters To Tidal Limit"
This station discharged sewage 0 time(s) during 2021.
The station discharged for a total of 0 hour(s).
This is around 0 day(s)* or 0% of the year.

99.9 | 3.5 hours
This monitor was operational for 99.9% of the year.
Leaving 3.5 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 #BP0345701
Secondary Permit #BP0345701


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Operator comments are presented, unedited, as they were received by us and do not reflect our views or position

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