The North Portsea Island Scheme covers 8.4km of coastline from Tipner through to Milton. Most of the area is low-lying and many of the current coastal defences are approaching the end of their effective lives. Predictions also indicate that sea levels are set to rise by up to a meter over the next 100 years, meaning the flood risk to the area will increase. The new scheme is designed to a 1 in 500 year (plus allowance for climate change to 2100) standard of protection against flooding, reducing the risk of flooding from the sea to over 4,200 homes, 500 businesses, and critical infrastructure including the Eastern Road over the next 100 years.
Figure 1 | Present day flood extent
Figure 2 | Flood extent in 100 years time
Thank You for Sharing Your Views
Early in 2014 we held 4 public exhibition events where the plans for coastal defences were showcased. Over 360 people attended the events and completed a questionnaire. The overwhelming majority of people recognised the need for new coastal defences around North Portsea Island. The consultation events allowed us to gather useful information from the public and wider stakeholders that fed into the option selection and design process.
Preferred Coastal Defence Options
Working with engineers, ecologists, heritage professionals and with support from the results of the consultation events, we have selected preferred coastal defence options for the whole north Portsea Island coastline.
Phase 1: Anchorage Park 2015 - 2016
New coastal defences were constructed in 2015 – 2016 to manage the flood and erosion risk to properties of Anchorage Park. The new defences comprise raised earth embankments with a rock revetment front face. These defences were the first construction phase of a 7 phased construction project.
Phase 2: Milton Common 2016
These works comprise the construction of 750m of rock revetment to manage the erosion risk to the historic landfill area of Milton Common and two set back earth embankments to manage flood risk to the residents of Portsmouth. Construction began in April 2016 and is due for completion end September 2016.
Phase 3: Tipner Lake 2017 - 2019
The flood defences at Tipner Lake comprises vertical sea walls to protect the area from flood risk. Landscaping works will also be developed to enhance the natural amenity of the surrounding area. The construction works are currently under way, with an expected end date in Autumn 2019.
Phase 4: Eastern Road and Kendall's Wharf: 2019
These are currently going through a detailed design review which once complete will lead to the procurement of the contractor.
Phase 5: Portscreek: 2023
Currently going through a detailed design review which once complete will lead to the procurement of the contractor.
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