Warsash Causeway

Hampshire County Council


Summer 2020

Warsash Causeway

Warsash Causeway is a very well used footpath which runs alongside the river Hamble.  As a causeway it is subject to the weathering effects of the tide and erosion from use.

Aquascience were initially tasked with providing Hampshire County Council with a survey and design proposal to establish where the causeway required repair and the methodology to be used.  This included flying a drone to provide an orthographic survey tied to Ordnance datum to provide a historic record of the causeway.

We were then successful bidding for the delivery stage.  This involved the use of rock rolls to provide stability to the edge of the causeway to limit erosion from wave action.  Failed concrete blocks along a large section were removed or recycled into backfill behind the rock rolls which are held in place by driven recycled plastic posts.  The rock rolls have helped dissipate energy from wave action.

The path surface was improved with a topping of bound aggregate and bridge abutments were repaired where required with further rock rolls and armorlock blocks.

Project Images

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