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A new 5 ha lagoon known as the Black Hole Marsh has recently been created on land owned by the East Devon District Council next to the Axe Estuary near Seaton. The Black Hole Marsh will provide a new wetland habitat.
In order to control the amount of salt water flooding the area a tidal valve was installed. The initial design of the valve was carried out by Mr. Mike Williams of the Environment Agency, with the engineering design completed by Mr. Stephen Kingett of Stoneman Engineering.
Key Benefits of the valve:
• Restores tidal flushing of the Black Hole Marsh, without the flooding of upland property.
• Restoration of wetland habitat.
• Controls flooding of marsh.
The image above and below shows the tidal valve in our workshop being fabricated. 
The above image shows a manual test being carried out on the tidal valve. This test represents the valve being closed during high-tide.
The above image shows a manual test being carried out on the tidal valve. This test represents the valve being closed during low-tide.
The above image shows a manual test being carried out on the tidal valve. This test represents the valve being half closed during a mid-tide.
The above image shows the tidal valve loaded onto a tram awaiting transportation to site.
The above image shows the valve in position during low-tide.
The above image shows a low-tide with the side valve open allowing fresh water into the estuary.
The above image shows the valve manually in the open position. This represents a mid-tide allowing salt water into the Black Hole Marsh. During high tide both valves are in the closed position.
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