River Basins Humber Aire and Calder Calder Lower Calder from River Colne to River Chald Thornhill Dewsbury No1 CSO
River Calder at Thornhill Dewsbury No1 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.
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
1005 hours | 3.82
The declared body of water receiving this discharge is the "River Calder"
This station has discharged sewage 165 time(s).
The station has discharged for a total of 1005 hour(s).
This is 3.82% of the time which we have data for.
In total: 41 day(s)* of elapsed time.
93.3 | 1752 hours
This monitor has been operational for 93.3% of its total time we have data for.
There are 1752 hours unaccounted for due to downtime of the monitor.
The worst year in our records for the "Thornhill Dewsbury No1 CSO" is 2023, discharging sewage for 362.7 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
362.7 hours | 4.14
The declared body of water receiving this discharge is the "River Calder"
This station discharged sewage 61 time(s) during 2023.
The station discharged for a total of 362.7 hour(s).
This is around 15 day(s)* or 4.14% 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
93.8 | 539.6 hours
This monitor was operational for 93.8% of the year.
Leaving 539.6 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 | Yorkshire Water |
| Primary Permit # | WRA8568 |
| Secondary Permit # | WRA8568 A1 |
2022
324.7 hours | 3.7
The declared body of water receiving this discharge is the "River Calder"
This station discharged sewage 49 time(s) during 2022.
The station discharged for a total of 324.7 hour(s).
This is around 13 day(s)* or 3.7% of the year.
88 | 1045 hours
This monitor was operational for 88% of the year.
Leaving 1045 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 2022:
Sensor Failure / Issue
The following description has been given for downtime related actions intended, or taken, by the operator in 2022:
Resolved - Feb
*This is total time in days, not individual days of the year.
Permit & Governance
| Attribute | Value |
|---|---|
| Governing Body | The Environment Agency |
| Operator | Yorkshire Water |
| Primary Permit # | WRA8568 |
| Secondary Permit # | WRA8568 A1 |
2021
317.5 hours | 3.62
The declared body of water receiving this discharge is the "River Calder"
This station discharged sewage 55 time(s) during 2021.
The station discharged for a total of 317.5 hour(s).
This is around 13 day(s)* or 3.62% of the year.
99.7 | 26.2 hours
This monitor was operational for 99.7% of the year.
Leaving 26.2 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 | Yorkshire Water |
| Primary Permit # | WRA8568 |
| Secondary Permit # | WRA8568 A1 |
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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
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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