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Wastewater impact assessed in the Solent

Southern Water has been undertaking a water quality modelling exercise aided by URS Scott Wilson

Data gathering off the South coast of England: the study will help Southern Water achieve compliance with the EU Shellfish DirectiveData gathering off the South coast of England: the study will help Southern Water achieve compliance with the EU Shellfish Directive

URS Scott Wilson is nearing the end of a £1.1M contract with Southern Water Services to undertake numerical modelling of hydrodynamic and water quality processes for a number of estuaries. The aim of the study is to assess the impact of existing wastewater treatment works and intermittent discharges on five designated shellfish waters. The work aims to identify the continuous sewage discharges at which UV disinfection will make a contribution to achievement of compliance with the Shellfish Waters Directive Guideline bacteriological standards. The study included a review of existing data and commissioned surveys to collect the hydrodynamic and water quality data required to undertake the coastal water quality modelling. URS Scott Wilson is working in partnership with Intertek/Metoc and Titan Environmental Surveys to deliver the following project stages:

• Scoping and data review
• Methodology development and agreement
• Surveys and investigations
• Model builds, validation and audit
• Compliance assessment
• Solutions development
• Deliverables

The overall design of the study and the development of the methodology considered:

• Continuous and intermittent asset sources
• Surface water drainage
• Private point and diffuse/background sources
• Bacterial loads and decay
• Seasonal differences such as decay, flows and population

The numerical modelling scope of the study included:

• Mathematical modelling to simulate the estuarine flows in Southampton Water and the Solent as well as the adjacent waters of the Isle of Wight
• A 3D model for the upper part of the Southampton Water estuary
• Mathematical modelling to simulate flows for the Stour Estuary and Pegwell Bay, Swalecliffe and Thames Estuary



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