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.
The declared body of water receiving this discharge is the "River Itchen Estuary" This station has discharged sewage 108 time(s). The station has discharged for a total of 1050.4 hour(s). This is 2.99% of the time which we have data for. In total: 43 day(s)* of elapsed time.
82.5 | 6136.2 hours This monitor has been operational for 82.5% of its total time we have data for. There are 6136.2 hours unaccounted for due to downtime of the monitor.
The worst year in our records for the "Chapel Wharf Wps" is 2023, discharging sewage for 593.4 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 - 2024
River Itchen Estuary | 40 Spills | 335 hours | 3.81 The declared body of water receiving this discharge is the "River Itchen Estuary" This station discharged sewage 40 time(s) during 2024. The station discharged for a total of 335 hour(s). This is around 13 day(s)* or 3.81% of the year. The following reasons have been given for the high spill frequency in 2024: High Spill Threshold Not Met The following comments have been given on the station operators intended actions: No Improvement Action In Reporting Period
77.4 | 1978.1 hours This monitor was operational for 77.4% of the year. Leaving 1978.1 hours unaccounted for in the data. This falls below the 90% threshold where a reason should be given
The following reasons have been given for the downtime in 2024: Installation Set-Up/Design Issue
The following description has been given for downtime related actions intended, or taken, by the operator in 2024: Resolved - January After Reporting Year
*This is total time in days, not individual days of the year.
Permit & Governance
Attribute
Value
Governing Body
The Environment Agency
Operator
Southern Water
Primary Permit #
A01146
Secondary Permit #
A1146/H/01
2023
River Itchen Estuary | 53 Spills | 593.4 hours | 6.77 The declared body of water receiving this discharge is the "River Itchen Estuary" This station discharged sewage 53 time(s) during 2023. The station discharged for a total of 593.4 hour(s). This is around 24 day(s)* or 6.77% of the year.
100 | 0 hours This monitor was operational for 100% of the year. Leaving 0 hours unaccounted for in the data.
*This is total time in days, not individual days of the year.
Permit & Governance
Attribute
Value
Governing Body
The Environment Agency
Operator
Southern Water
Primary Permit #
A01146
Secondary Permit #
A1146/H/01
2022
River Itchen Estuary | 14 Spills | 113.6 hours | 1.29 The declared body of water receiving this discharge is the "River Itchen Estuary" This station discharged sewage 14 time(s) during 2022. The station discharged for a total of 113.6 hour(s). This is around 4 day(s)* or 1.29% of the year.
99.9 | 0.8 hours This monitor was operational for 99.9% of the year. Leaving 0.8 hours unaccounted for in the data.
*This is total time in days, not individual days of the year.
Permit & Governance
Attribute
Value
Governing Body
The Environment Agency
Operator
Southern Water
Primary Permit #
A01146
Secondary Permit #
A1146/H/01
2021
Note: Data is potentially unreliable in 2021 Due to high unavailability of the monitor
River Itchen Estuary | 1 Spills | 8.2 hours | 0.09 The declared body of water receiving this discharge is the "River Itchen Estuary" This station discharged sewage 1 time(s) during 2021. The station discharged for a total of 8.2 hour(s). This is around 0 day(s)* or 0.09% of the year.
54 | 4029.6 hours This monitor was operational for 54% of the year. Leaving 4029.6 hours unaccounted for in the data. This falls below the 90% threshold where a reason should be given
The following reasons have been given for the downtime in 2021: Power Failure / Issue
The following description has been given for downtime related actions intended, or taken, by the operator in 2021: Resolved - July
*This is total time in days, not individual days of the year.
Permit & Governance
Attribute
Value
Governing Body
The Environment Agency
Operator
Southern Water
Primary Permit #
A01146
Secondary Permit #
A1146/H/01
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