River Basins . . . Carrog Caernarfon - Rhostryfan CSO No
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Carrog at Caernarfon - Rhostryfan CSO No

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
Carrog | 249 Spills |
653 hours | 2.48


The declared body of water receiving this discharge is the "Carrog"
This station has discharged sewage 249 time(s).
The station has discharged for a total of 653 hour(s).
This is 2.48% of the time which we have data for.
In total: 27 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 "Caernarfon - Rhostryfan CSO No" is 2021, discharging sewage for 314.2 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
Carrog | 94 Spills |
185.5 hours | 2.11

The declared body of water receiving this discharge is the "Carrog"
This station discharged sewage 94 time(s) during 2023.
The station discharged for a total of 185.5 hour(s).
This is around 7 day(s)* or 2.11% 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 #CG0076904
Secondary Permit #CG0076904

2022
Carrog | 84 Spills |
153.2 hours | 1.74

The declared body of water receiving this discharge is the "Carrog"
This station discharged sewage 84 time(s) during 2022.
The station discharged for a total of 153.2 hour(s).
This is around 6 day(s)* or 1.74% of the year.

99.9 | 6.1 hours
This monitor was operational for 99.9% of the year.
Leaving 6.1 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 #CG0076904
Secondary Permit #CG0076904

2021
Carrog | 71 Spills |
314.2 hours | 3.58

The declared body of water receiving this discharge is the "Carrog"
This station discharged sewage 71 time(s) during 2021.
The station discharged for a total of 314.2 hour(s).
This is around 13 day(s)* or 3.58% 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 #CG0076904
Secondary Permit #CG0076904


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