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Despite operational improvements over the last 10-15 years, water utilities

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Deployable output (source availability) from water resources in north west England is predicted to decrease over the next 25 years. Alternative supply management strategies are planned to help avoid a deficit in the supply-demand balance within the region but have yet to be considered in detail. This paper assesses the contribution of such an alternative supply strategy at local level on the water resource supply-demand balance at regional level based on a proposed urban regeneration site in north west England. Various water conservation and reuse measures are investigated considering local and regional conditions and constraints. Four future scenarios are presented and used to describe how the future might be (rather than how it will be), to allow an assessment to be made of how current 'sustainable solutions' might cope whatever the future holds. The analysis determines the solution contributions under each future and indicates that some strategies will deliver their full intended benefits under scenarios least expected but most needed. It is recommended that to help reduce the regional supply-demand deficit and maximise system resilience to future change, a wide range of water demand management measures should be incorporated on this and other sites.

This paper considers development of a methodology for an on-line energy and leakage management in water distribution systems, formulated within a model predictive control framework. The approach involves calculation of control actions, i.e. time schedules for pumps, valves and sources, to minimize the costs associated with energy used for water pumping and treatment and water losses due to leakage, whilst satisfying all operational constraints. The process of computing the control action utilises EPAnet hydraulic simulator, a mathematical modelling language called GAMS and a non-linear programming solver called CONOPT. The proposed control scheme has been integrated with an industrial SCADA system from ABB and interfaced with an actual medium-scale water distribution systems being part of Yorkshire Water Services. The scheme is currently being tested using on-line telemetry data. It has been operational for over 1 month with 1 hour sampling time and the preliminary results described in this paper indicate a potential for savings of 30% of the cost of electrical energy.

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