Coastal Defence

Assessment, part of an Environmental Statement relating to extended coastal protection measures at Hurst Castle, a Scheduled Ancient Monument at Keyhaven Hampshire  undertaken in challenging tidal conditions

Hurst Castle is a well-preserved stone artillery fort and Scheduled Ancient Monument built between 1541 and 1544 on the headland of Hurst Spit to defend the Needles Passage to the Solent.

 The Castle was much altered in the early to mid-19th Century and supports defensive structures of both World Wars and lighthouses of 1865 and 1911. The extensive remains of sea defences, comprising a series of timber and concrete breakwaters, exist along the foreshore immediately south of the Castle.

 The sea defences were constructed in 1717 and maintained throughout the 18th Century, with further extensions made during the early to mid-19th Century. Reconstruction was carried out in 1964 and new groynes and rock defences were installed by English Heritage in the 1980s, with further reconstruction in 1997.

 Based on recognized Historic England criteria, the assessment process identified a number of specific Heritage Assets and their associated settings, including the 16th Century and later artillery fort and associated fortifications, infrastructure (including a port, docks and several lighthouses) and coastal defences.

 Assessment was then carried out of their significance and the extent to which their settings contributed to their significance and the magnitude of impact of the proposed development on both heritage asset and setting.

It was concluded that the overall impact on the built environment, both in terms of physical and non-physical impacts, was Neutral/Slight with any impact on the built heritage as Negligible to Minor. This assessment reflects the relatively limited scope of the proposed works, the short-term temporary nature of the construction impacts and the low-impact engineering methodology.

In Brief

Client: JBA Consulting on behalf of English Heritage Sector: Infrastructure/Coastal Defence Services: Archaeological Desk-based Assessment and Heritage Impact Assessment Location: Hurst Castle, South Coast of England

Key Points

Proposed repairs to stub wall in front of Castle, including piling for new and replacement groynes Challenging tidal conditionsIdentification of Heritage Assets and assessments of impacts, with site visit and photographic survey undertaken to assess key viewpointsProject completion within compressed timeframe

Results

We were able to determine the potential impact of the proposed development – both physical and non-physical – on the specified built heritage assets and their respective settings.