Tributary Of River Darwen at Higher Perry St/Black Laurel St 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.

Sewage Reports that include this Station

Operational Summary - 2021-2023

Tributary Of River Darwen | 270 Spills |
388 hours | 1.47

The declared body of water receiving this discharge is the "Tributary Of River Darwen"
This station has discharged sewage 270 time(s).
The station has discharged for a total of 388 hour(s).
This is 1.47% of the time which we have data for.
In total: 16 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 "Higher Perry St/Black Laurel St CSO" is 2021, discharging sewage for 175.2 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

Tributary Of River Darwen | 97 Spills |
118.4 hours | 1.35
The declared body of water receiving this discharge is the "Tributary Of River Darwen"
This station discharged sewage 97 time(s) during 2023.
The station discharged for a total of 118.4 hour(s).
This is around 4 day(s)* or 1.35% 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

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	United Utilities
Primary Permit #	01BBN0118
Secondary Permit #	BBN0118

2022

Culverted Tributary Of River Darwen Via Surface Water Sewer | 86 Spills |
94.4 hours | 1.07
The declared body of water receiving this discharge is the "Culverted Tributary Of River Darwen Via Surface Water Sewer"
This station discharged sewage 86 time(s) during 2022.
The station discharged for a total of 94.4 hour(s).
This is around 3 day(s)* or 1.07% of the year.

The following reasons have been given for the high spill frequency in 2022:
Performance - Asset Configuration (E.G. Ps/Rising Main/Storm Tanks)

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

95.4 | 398.5 hours
This monitor was operational for 95.4% of the year.
Leaving 398.5 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	United Utilities
Primary Permit #	01BBN0118
Secondary Permit #	BBN0118

2021

Tributary Of River Darwen | 87 Spills |
175.2 hours | 2
The declared body of water receiving this discharge is the "Tributary Of River Darwen"
This station discharged sewage 87 time(s) during 2021.
The station discharged for a total of 175.2 hour(s).
This is around 7 day(s)* or 2% 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

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	United Utilities
Primary Permit #	01BBN0118
Secondary Permit #	BBN0118

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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

River Darwen at Darwen, affecting Hollins Grove off Blackburn Road between Bright St and Clarence St

River Darwen at Darwen, between Bright Street and Vale Street in the Livesey Fold area of Darwen

Upper River Darwen at Darwen, Cross Street to Holme Street

River Darwen at Darwen, comprising properties between Hardman Way and the M65

Upper River Darwen at Darwen, Clough Street to Cross Street

Station Data Information

Station overseen (meaning either provided, or regulated) by: The Environment Agency
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