content@managingwater.co.uk Fish Passes & River Structures


The UK’s first Siphon Siphon Passes


The Wissey Fish Pass is unique in the UK, being the first Siphon Fish Pass. The Siphon Fish Pass, developed in the Netherlands, is an innovative fish passage system based on the traditional pool and weir fish pass. The Siphon Fish Pass can be utilised to provide migratory fish passage at many natural or manmade watercourse obstructions including weirs, lock structures, sluices and even between different watercourses. The Siphon Fish Pass can allow passage of most types of fish, varying from small coarse fish and eels to large migratory salmonids


without compromising any existing flood defences. The Wissey Fish Pass The Wissey diversion sluice


Located in Stoke Ferry, North Norfolk, the Wissey diversion sluice forms a physical barrier between a cut- off channel and the River Wissey. An important structure in terms of managing water levels and controlling the flood risk, but the structure acts as an


impassable barrier for coarse fish, salmonids and eels.


Why a Siphon Fish Pass


1. The siphon provides fish and eel migration in both directions between the two water courses


Length: 70 m Diameter: 1.8m Baffles: 25 (1 per 100 mm of head difference) Project duration: 9 months Total cost: £407k


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2. The siphon at the Wissey site is partially buried allowing easy integration into the existing landscape without the need for hard engineered foundations. 3. In times of high flows the siphon can be shut down and isolated to remove any risk of flooding. 4. Utilising the natural siphon effect, power and water consumption is kept to a minimum


5. A unique design requiring minimal civil engineering makes the siphon substantially cheaper than other traditional options


The Wissey Siphon Fish pass project was completed from initial site visit to commissioning in just nine months. This is testament to careful planning, hard work, strong teamwork and a truly innovative product.


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