River Basins Western Valley Trunk Sewer CSO
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Severn Lower at Western Valley Trunk Sewer 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.
Sewage Reports that include this Station
Operational Summary - 2021-2023
Severn Lower | 602 Spills |
11125.2 hours | 42.33


The declared body of water receiving this discharge is the "Severn Lower"
This station has discharged sewage 602 time(s).
The station has discharged for a total of 11125.2 hour(s).
This is 42.33% of the time which we have data for.
In total: 463 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 "Western Valley Trunk Sewer CSO" is 2023, discharging sewage for 4036.7 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 | 207 Spills |
4036.7 hours | 46.08

The declared body of water receiving this discharge is the "Severn Lower"
This station discharged sewage 207 time(s) during 2023.
The station discharged for a total of 4036.7 hour(s).
This is around 168 day(s)* or 46.08% of the year.

99.6 | 34.1 hours
This monitor was operational for 99.6% of the year.
Leaving 34.1 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 #AN0306001
Secondary Permit #AN0306001

2022
Severn Lower | 166 Spills |
3102.2 hours | 35.41

The declared body of water receiving this discharge is the "Severn Lower"
This station discharged sewage 166 time(s) during 2022.
The station discharged for a total of 3102.2 hour(s).
This is around 129 day(s)* or 35.41% 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 #AN0306001
Secondary Permit #AN0306001

2021
Severn Lower | 229 Spills |
3986.2 hours | 45.5

The declared body of water receiving this discharge is the "Severn Lower"
This station discharged sewage 229 time(s) during 2021.
The station discharged for a total of 3986.2 hour(s).
This is around 166 day(s)* or 45.5% 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 #AN0306001
Secondary Permit #AN0306001


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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
Nearby Flood Warnings
None
Nearby Alert Areas
None
Nearby Stations
No nearby stations
Nearby Sewage Discharge Stations
No nearby stations
Station Data Information
Station overseen (meaning either provided, or regulated) by: Natural Resources Wales
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