Chess Brook at Henfield Wastewater Treatment Works
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.
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
1956.6 hours | 7.44
The declared body of water receiving this discharge is the "Chess Brook"
This station has discharged sewage 187 time(s).
The station has discharged for a total of 1956.6 hour(s).
This is 7.44% of the time which we have data for.
In total: 81 day(s)* of elapsed time.
98.3 | 438 hours
This monitor has been operational for 98.3% of its total time we have data for.
There are 438 hours unaccounted for due to downtime of the monitor.
The worst year in our records for the "Henfield Wastewater Treatment Works" is 2023, discharging sewage for 1026.3 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
1026.3 hours | 11.71
The declared body of water receiving this discharge is the "Chess Brook"
This station discharged sewage 87 time(s) during 2023.
The station discharged for a total of 1026.3 hour(s).
This is around 42 day(s)* or 11.71% of the year.
The following reasons have been given for the high spill frequency in 2023:
Performance - Infiltration
The following comments have been given on the station operators intended actions:
Scheduled
99.8 | 17.5 hours
This monitor was operational for 99.8% of the year.
Leaving 17.5 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 # | W00015 |
| Secondary Permit # | COPA/177 |
2022
328.2 hours | 3.74
The declared body of water receiving this discharge is the "Chess Brook"
This station discharged sewage 36 time(s) during 2022.
The station discharged for a total of 328.2 hour(s).
This is around 13 day(s)* or 3.74% of the year.
The following reasons have been given for the high spill frequency in 2022:
N/A - Ongoing Investigation
The following comments have been given on the station operators intended actions:
N/A - Ongoing Investigation
97.7 | 197.1 hours
This monitor was operational for 97.7% of the year.
Leaving 197.1 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 # | W00015 |
| Secondary Permit # | COPA/177 |
2021
601.9 hours | 6.87
The declared body of water receiving this discharge is the "Chess Brook"
This station discharged sewage 64 time(s) during 2021.
The station discharged for a total of 601.9 hour(s).
This is around 25 day(s)* or 6.87% of the year.
99 | 87.6 hours
This monitor was operational for 99% of the year.
Leaving 87.6 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 # | W00015 |
| Secondary Permit # | COPA/177 |
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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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Please note that FloodMapper does not verify or check the accuracy of the data provided by third parties. The data is used as received from the source. Any underlying errors, inconsistencies, or inaccuracies in the original data will be reflected in the information presented on our platform. Users are advised to exercise their own judgment and caution when using the data for decision-making purposes.
Information about our data sources and licenses can be found
The information displayed here is used under license. We are not affiliated with any governing, or other, bodies. Nor do they necessarily endorse us, or us them.
Please note that FloodMapper does not verify or check the accuracy of the data provided by third parties. The data is used as received from the source. Any underlying errors, inconsistencies, or inaccuracies in the original data will be reflected in the information presented on our platform. Users are advised to exercise their own judgment and caution when using the data for decision-making purposes.
Information about our data sources and licenses can be found
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