Discharge Monitoring
Paired upstream and downstream continuous water quality monitoring for storm overflows, CSOs and treatment works outlets on the wastewater network, covering section 82 programmes and EnvAct_INV4 investigations.
30 mins
Average deployment time
98% +
Data Capture across four years of deployments
6 years
Longest continuous data set
800 +
Deployments across 4 countries
Section 82
Section 82 puts monitors at thousands of overflows for years. Our deployment, communication, and service methods make that easier whilst delivering data you can trust.​
WINEP
Short term investigations can't afford holdups from access issues.​
Our in stream monitoring solution provides options when kiosks won't work, and our evidence packs make the decision process clear.
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What we measure
Dissolved oxygen, temperature, pH, turbidity, ammonium and conductivity.
The sensor array can be changed under our service if the required parameter set changes.
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Calibration and maintenance
Monitors are calibrated at our service centre against traceable standards, under processes designed to ISO/IEC 17025. They’re swapped on site at the four-week interval the interim standard sets, or to your programme’s schedule. Before issue, every monitor is batch-tested against a reference instrument.
Nobody on site handles buffers or calibration. Between swaps, sensors are wiped every two to four weeks.
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Siting
WaQA mounts mid-river on a float and anchor, from the bank on a ground screw, from a bridge parapet, or on a slack line. The downstream monitor goes where mixing is complete, whatever the bank access at that point.
Housings are IP68.
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Data
Each monitor stores six months of 15-minute readings onboard and uploads when the connection returns.
Raw data is retained unaltered alongside the validated dataset.
Data capture has been above 98% across more than 800 deployments.
Water quality can be viewed against rainfall and network data, so a spill’s effect on the receiving water can be separated from background conditions.
An optional AW-108 camera records the outfall, giving a visual record of when each discharge started and stopped.
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Fleet and servicing
Site are serviced from our local hubs across New Zealand, the UK, Ireland, and Australia. Small investigations run from our general fleet.
Larger programmes can have monitors ring-fenced for their duration.
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Talk to our UK and Irish teams
For references and case studies, project scopes and site-count modelling, contact our team.