Guernsey Water Annual Report 2016

Guernsey Water 2016 Annual Report EFFECTIVE DRAINAGE 12 water.gg/ annualreport2016 EFFECTIVE DRAINAGE Develop partnerships that reduce the impact of flooding Reverse the deterioration of our wastewater drainage systems Tackle sewer flooding and pollution from sewer overflows Our customers are protected from flooding and wastewater is returned safely to the environment 3 Performance Highlights Our priority was to develop a long term strategy for adapting our drainage systems to climate change and managing surface water on the island as part of our integrated drainage strategy. Our surface water management policy was completed and endorsed by the Committee for the Environment and Infrastructure. This allowed us to develop proposals for a Surface Water Management Strategy which will be completed in 2017. To demonstrate our surface water management policyweworkedwithother States Offices to refurbish an outdoor play area at Vauvert Primary School using sustainable drainage techniques. Monitoring after theworkwas completed proved the benefit of this approach. We will now develop our strategy for implementing this policyacross the island. Completion of our wastewater SCADA system has enabled us to better understand the performance of our foul and surface water pumping stations, control them remotely and respond to emergencies caused by asset failure. Year-on-year performance data can now be analysed and trends on performance can be better understood. Asset recovery plans using the benefits of remote monitoring and control have also been developed for some of our critical pumping stations. This work will continue in 2017. The completion of our wastewater hydraulicmodel has enabled us to better understand some of the recent flooding on the island. Solutions to reduce the risk of flooding for customers can now be tested within the model. CASE STUDY Sustainable Drainage Project Guernsey Water worked in partnership with the Education Department at Vauvert Primary School to reduce the speed of run-off water into the main foul sewer and consequential flash flooding downstream. Some of the surface water management techniques included a shallow planted trench and permeable playground. Rain water flow monitoring now shows a significant reduction in the surface water speed into the foul sewer network. 41,430 METRES OF SEWER WAS CLEANED DURING 2016

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