Havre des Pas Coastal Flood Alleviation Scheme – Public consultation

Between June 2018 and January 2020, the Government of Jersey developed a Shoreline Management Plan (SMP). The aim is to make sure our coastal defences can protect Jersey for the next 100 years.

The plan looks at risks to:

• our communities
• the environment
• the economy

It reviews the condition of the current coastal defences, and suggests improvements over 3 time periods known as epochs:

1. 2020 to 2040
2. 2040 to 2070
3. 2070 to 2120

For each coastline area, called a Coastal Management Unit (CMU), the plan suggests the best way to manage future flood risks.

This project focuses on the Havre des Pas coastline, from La Collette in the west to La Grande Charrière Slipway in the east. This is known as CMU-1.8 in the SMP.

CMU-1.8 has the highest risk of coastal flooding and is the top priority for action.

The SMP recommends:

• 2020 to 2040: Adaptive Management (make changes as needed) and Advance the Line (build new defences further out to sea)
• 2040 to 2120: Maintain the Defence Line (keep the current line of defences)

What the scheme will do

The scheme aims to protect homes and businesses from flooding caused by severe storms. It’s designed to withstand a 1 in 200-year flood event, which means it has a 0.5% chance of happening in any year.

The scheme also accounts for sea level rise to the year 2130.

Since 2023, the project has been in the engineering feasibility stage.

During this phase, engineers looked at:

• the flood risk:
  • wave overtopping
  • still water (high tides)
• ​different possible solutions based on:
  • feasibility and constructability
  • ability to address present day flood risk and future risk
• the pros and cons of each solution
• ​economic assessment for the scheme and business case development

Full information on this consultation can be found at gov.je/consultations