River Derwent at Duffield STW
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
2855.9 hours | 10.86
The declared body of water receiving this discharge is the "River Derwent"
This station has discharged sewage 241 time(s).
The station has discharged for a total of 2855.9 hour(s).
This is 10.86% of the time which we have data for.
In total: 118 day(s)* of elapsed time.
92.3 | 2014.8 hours
This monitor has been operational for 92.3% of its total time we have data for.
There are 2014.8 hours unaccounted for due to downtime of the monitor.
The worst year in our records for the "Duffield STW" is 2023, discharging sewage for 1749.4 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 - 2023
1749.4 hours | 19.97
The declared body of water receiving this discharge is the "River Derwent"
This station discharged sewage 139 time(s) during 2023.
The station discharged for a total of 1749.4 hour(s).
This is around 72 day(s)* or 19.97% of the year.
The following reasons have been given for the high spill frequency in 2023:
Data Collection - Confirmed Exceptional Weather – Remaining Spills Not Above Soaf Threshold
The following comments have been given on the station operators intended actions:
Resolved - January After Reporting 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 | Severn Trent Water |
| Primary Permit # | T/44/08090/R |
| Secondary Permit # | T/44/08090/R |
2022
800.9 hours | 9.14
The declared body of water receiving this discharge is the "River Derwent"
This station discharged sewage 71 time(s) during 2022.
The station discharged for a total of 800.9 hour(s).
This is around 33 day(s)* or 9.14% 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:
Scheduled
99.7 | 24.5 hours
This monitor was operational for 99.7% of the year.
Leaving 24.5 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 | Severn Trent Water |
| Primary Permit # | T/44/08090/R |
| Secondary Permit # | T/44/08090/R |
2021
305.5 hours | 3.48
The declared body of water receiving this discharge is the "River Derwent"
This station discharged sewage 31 time(s) during 2021.
The station discharged for a total of 305.5 hour(s).
This is around 12 day(s)* or 3.48% of the year.
The following comments have been given on the station operators intended actions:
Scheduled
78.7 | 1862.3 hours
This monitor was operational for 78.7% of the year.
Leaving 1862.3 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:
Sensor Failure / Issue
The following description has been given for downtime related actions intended, or taken, by the operator in 2021:
Resolved - March
*This is total time in days, not individual days of the year.
Permit & Governance
| Attribute | Value |
|---|---|
| Governing Body | The Environment Agency |
| Operator | Severn Trent Water |
| Primary Permit # | T/44/08090/R |
| Secondary Permit # | T/44/08090/R |
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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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