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Emerging and Forgotten Challenges? Pollution and pressure

At RPS we work with Water Companies to understand the risk of asset failure across all types of assets within wastewater and clean water networks. This enables us to predict the impact on serviceability (flooding and pollution), enabling wider customer and environmental objectives to be met.

09 March 2023 | 3 min read
Dr Joe Sanders

UK

Gravity sewers make up the bulk of the network transferring foul and storm flow to treatment. However where pumping is required, stations lift and shift flow in pressurised rising mains, creating a set of challenges unique to wastewater, but not unique to the water industry.

These pumping mains have often been considered a forgotten asset, with historical investment focussing on high profile flooding and pollution schemes, but this perceived under investment in an ageing set of assets could lead to a “bow wave” of failures and a rise in the number of pollution incidents attributable to these bursts. However, bursts and flooding have long been a challenge familiar to the supply of clean water. It is becoming more apparent that significant discharges of chlorinated water into rivers and streams from burst water mains can have significant environmental impact and as such can be considered a pollution incident, so a mechanism and process to establish the consequence of failure and the risk of these pressurised systems is a critical part of future pollution reduction.

So with failures in pressurised assets of all types leading to increases in pollution numbers, RPS’ asset management, complex analytics and risk assessment tools can support Water Companies in building knowledge around the likelihood of problems occurring, but also the consequence of failure, enabling targeted proactive intervention to reduce pollution incidents.

water leakage

Consequence is key – determining the impact of bursts

The RPS PondSIM tool, part of the WaterNet Pro suite, enables a rapid impact assessment of asset failure to be undertaken, determining the consequence of overland flood waters. We have been using this tool to assess the impact of gravity systems through blockage and capacity exceedance, as well as to understand the impact of bursts across the length of rising mains, or at critical control structures in both waste and clean networks such as air valves and hydrants, with both route and consequence visualised in our web portal.

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This impact assessment allows the categorisation of flooding impacts to buildings, locations and surfaces, as well as the pollution impact on watercourses and sensitive sites, using all available categorisation information to determine the severity of pollution impact. With PondSIM allowing time/flow varying inputs, this has allowed for the impact of slow and steady seeping flow to catastrophic burst scenarios, replicating the impact of hundreds of litres per second of water on large impact areas.

 

Improved investment planning and pro-active response

At RPS we are in a better position to understand the consequence of failure of pressurised systems both in wastewater and clean water and using WaterNet Pro to proactively monitor the network in real time, we are able to identify issues before they become pollution problems, enabling pro-active response and investment, avoiding the costly impact of a pollution incident.

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If you would like to discuss this topic further and understand how RPS can support you to achieve your 'zero pollution' goals, please contact me anytime.

Dr Joe Sanders

Senior Technical Director

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