River Basins Llandegfan (Menai) Pumping Station
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Menai Strait at Llandegfan (Menai) Pumping Station

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.
Operational Summary - 2021-2023
Menai Strait | 273 Spills |
4688 hours | 17.83


The declared body of water receiving this discharge is the "Menai Strait"
This station has discharged sewage 273 time(s).
The station has discharged for a total of 4688 hour(s).
This is 17.83% of the time which we have data for.
In total: 195 day(s)* of elapsed time.

99.3 | 175.2 hours
This monitor has been operational for 99.3% of its total time we have data for.
There are 175.2 hours unaccounted for due to downtime of the monitor.


The worst year in our records for the "Llandegfan (Menai) Pumping Station" is 2021, discharging sewage for 2114 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
Menai Strait | 104 Spills |
1779.2 hours | 20.31

The declared body of water receiving this discharge is the "Menai Strait"
This station discharged sewage 104 time(s) during 2023.
The station discharged for a total of 1779.2 hour(s).
This is around 74 day(s)* or 20.31% of the year.

99.9 | 4.3 hours
This monitor was operational for 99.9% of the year.
Leaving 4.3 hours unaccounted for in the data.


*This is total time in days, not individual days of the year.

Permit & Governance

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #CG0363801
Secondary Permit #CG0363801

2022
Menai Strait | 54 Spills |
794.7 hours | 9.07

The declared body of water receiving this discharge is the "Menai Strait"
This station discharged sewage 54 time(s) during 2022.
The station discharged for a total of 794.7 hour(s).
This is around 33 day(s)* or 9.07% of the year.

99.9 | 1.7 hours
This monitor was operational for 99.9% of the year.
Leaving 1.7 hours unaccounted for in the data.


*This is total time in days, not individual days of the year.

Permit & Governance

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #CG0363801
Secondary Permit #CG0363801

2021
Menai Strait | 115 Spills |
2114 hours | 24.13

The declared body of water receiving this discharge is the "Menai Strait"
This station discharged sewage 115 time(s) during 2021.
The station discharged for a total of 2114 hour(s).
This is around 88 day(s)* or 24.13% 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

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #CG0363801
Secondary Permit #CG0363801


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Local Information
Station Data Information
Station overseen (meaning either provided, or regulated) by: Natural Resources Wales
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