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River Avon (Via Sws) at Market Street 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
River Avon (Via Sws) | 136 Spills |
149 hours | 0.56


The declared body of water receiving this discharge is the "River Avon (Via Sws)"
This station has discharged sewage 136 time(s).
The station has discharged for a total of 149 hour(s).
This is 0.56% of the time which we have data for.
In total: 6 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 "Market Street CSO" is 2023, discharging sewage for 70 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
River Avon (Via Sws) | 56 Spills |
70 hours | 0.79

The declared body of water receiving this discharge is the "River Avon (Via Sws)"
This station discharged sewage 56 time(s) during 2023.
The station discharged for a total of 70 hour(s).
This is around 2 day(s)* or 0.79% of the year.

The following reasons have been given for the high spill frequency in 2023:
Not Asset Maintenance - Hydraulic Capacity

The following comments have been given on the station operators intended actions:
N/A - Hydraulic Capacity

99.9 | 7 hours
This monitor was operational for 99.9% of the year.
Leaving 7 hours unaccounted for in the data.


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

Permit & Governance

AttributeValue
Governing BodyThe Environment Agency
OperatorWessex Water
Primary Permit #101649
Secondary Permit #16899C

2022
River Avon (Via Sws) | 42 Spills |
58.9 hours | 0.67

The declared body of water receiving this discharge is the "River Avon (Via Sws)"
This station discharged sewage 42 time(s) during 2022.
The station discharged for a total of 58.9 hour(s).
This is around 2 day(s)* or 0.67% of the year.

The following reasons have been given for the high spill frequency in 2022:
Not Asset Maintenance - Hydraulic Capacity

The following comments have been given on the station operators intended actions:
N/A - Hydraulic Capacity

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 BodyThe Environment Agency
OperatorWessex Water
Primary Permit #101649
Secondary Permit #16899C

2021
River Avon (Via Sws) | 38 Spills |
20.1 hours | 0.22

The declared body of water receiving this discharge is the "River Avon (Via Sws)"
This station discharged sewage 38 time(s) during 2021.
The station discharged for a total of 20.1 hour(s).
This is around 0 day(s)* or 0.22% of the year.

The following reasons have been given for the high spill frequency in 2021:
Not Asset Maintenance - Hydraulic Capacity

The following comments have been given on the station operators intended actions:
N/A - Hydraulic Capacity

99.2 | 70 hours
This monitor was operational for 99.2% of the year.
Leaving 70 hours unaccounted for in the data.


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

Permit & Governance

AttributeValue
Governing BodyThe Environment Agency
OperatorWessex Water
Primary Permit #101649
Secondary Permit #16899C


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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: The Environment Agency
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