THE MAGAZINE FOR THE DRAINAGE,WATER &WASTEWATER INDUSTRIES
which is more accessible and meaningful to public representatives, interest groups and
stakeholders.This also enables bodies such as the EnvironmentAgency to promote the use of open data, providing live data links, advice and services to a diverse range of public groups and organisations such as flood awareness groups, rivers trusts and angling organisations. During the coronavirus pandemic the EnvironmentAgency collected over 16,000 samples per day using ESNET and the cloud-based viewer was madeavailable to all water quality practitioners across the Defra family, as well as a wide range of external bodies.
The advantages of remote monitoring networks
By collecting data automatically; the volume of evidence increases dramatically, furthermore, such systems are resilient to the effects of issues such as a lockdown; because monitoring practitioners are able to collect and assess data; even if they are isolated athome. In recent years, sensors andwater quality sondes have undergone significant development to improve reliability and extend the period between service and
calibration.MeteorCommunications provides a comprehensive maintenance programfor customers on a monthly basis and freshly calibrated units are constantly in circulation within the ESNET system. Continuous monitoring enables the detection of transient spikes that can arise frompollution incidents; helping to raise timely alarms and identify ongoing sources of
pollution.This evidence can be used to develop informed interventions by stakeholders in industry and agriculture, and to enable the adoption of practices that improvewater quality. Integrated systems such as those operated in theThamesValley catchment are able to track pollution events as theymove with the river, whichmeans for example, thatwater treatment plants can adjust their intakes accordingly. Tidal water presents a major monitoring challenge because large volumes of saline water are constantlymoving back and forth, which significantly complicates the comparison ofmeasurements at one point on the river. So, for example, a measurement at one location at9amis not directly comparable with another measurement at9amaweek later, because one might be taken at lowtide and the other at high
tide.The transient effects ofCSO’s and algal activity further complicate the picture. Water quality scientists at the EnvironmentAgency have thereforeworked closely with MeteorCommunications to develop a software-based monitoring system, known as‘HalfTideCorrection’(HTC). In simple terms, this corrects for the effects of the tide and allows assessment of the underlying water quality. Continuous, accurate and robust data allowsmanagers to assess the impact of developments and remediation
measures.Good data, used as evidence, informs the evaluation of investments and leads to better decisionmaking. The ESNET network also provides image acquisition, and the Environment Agency and others have deployed over 600 ESNET camera
sites.These remote cameras are used to continuously monitor a wide range of flood defence infrastructure and assets; rapidly detecting blockages or overflows and avoiding the need for unnecessary and costly site visits. ESNET systems also provide an essential tool for measuring the effectiveness of Natural FloodManagement (NFM) schemes. In Oxfordshire for example,working with a wide range of partners in the Evenlode catchment, the systems are helping to evaluate the effectiveness of NFMmeasures for the local community and other stakeholders.
Utilities - final effluent monitoring
The flexibility of the ESNET systems makes them ideal for monitoring water quality atwaste water
treatmentworks.The responsibility for
FOLLOW US
monitoring discharges rests with the operators themselves under the terms of operator self-monitoring (OSM) agreements.OSMis now delivered by a spot sampling regime supported by real time monitors, so an opportunity exists for all stakeholders to benefit fromthe advantages of continuous monitoring. AUK water company is nowoperating 130 ESNET final effluent monitoring systems across their
business.These sites have continued to operate during theCOVID-19 lockdownproviding operators and managers with vital data with which to assess performance and compliance during this challenging period.
Summary
Recent advances in technology have enabled the development of continuous monitoring systems that are quick and easy to
install.The portable ESNET systemis routinely commissioned in less than an hour, and thepumpedkiosks can usually be installed within half a day. With little or no capitalworks necessary prior to the installation of an ESNET system, continuous, easily accessible, multi-parameter data can be established quickly and cost effectively. Real-time monitoring means less travel, less time on site and a lower carbon footprint. Real time data can also be provided to stakeholders, timely alarms triggered and monitoring can continue unaffected by the impact of viral pandemics.
Siltbuster Supports critical refurbishment projects at Severn TrentWater
Siltbuster Process Solutions (SPS), the water treatment specialist, has provided temporary treatment solutions across five different wastewater sites owned by Severn Trent Water. The siteswere undergoing refurbishment by specialist contractors, includingMWHTreatment and Nomenca, as part of a capital maintenance programme. SPS, which is theUK’s leading provider for modular and packaged treatment systems for the municipal and industrial wastewater sectors, devised a range of tailored temporary systems which addressed each site’s specific challenges and ensured they remained compliant throughout. At the EdgmondRoad, Lower Penn and Swinfordwastewater sites, SPS was taskedwith treating sewagewaterswhile reed bedswere being refurbished byMWHTreatment.
September 2020 | drain TRADER 29
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