Linking river and floodplain management:  A step-by-step guide to developing operating protocols for water level control structures

J. L. Eyquem  (Royal Haskoning - joanna.eyquem@gmail.com)

J. Wheeldon  (Natural England)

Proceedings paper from the 10th Annual River Restoration Centre Network Conference, 1st - 2nd April 2009

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Abstract

Water level control structures are a key influence on the hydromorphology and biology of many water-dependant habitats, in particular lowland rivers and their floodplains. Many control structures are operable and the way in which they are operated can significantly affect the impact of the structure, including interactions between river and wetland and freshwater and saline habitats.

In the UK, many water level control structures associated with river and floodplain habitats were constructed historically, for example in association with milling, navigation and agricultural practices which are no longer undertaken. Contemporary review of their function may reveal that certain structures are now obsolete and removal of the structure should be considered as a first option. Where the structure cannot be removed or modified to reduce its impact, or is fulfilling a required function, operating protocols can be developed to ensure that the structure is operated in a way that balances both the requirement of water-dependant habitats and the interests of river users.

With over 100 weir and hatch structures throughout the designated Site of Special Scientific Interest (SSSI), structural operation is key to managing water levels within the Hampshire River Avon and its adjacent floodplain. In order to integrate management of water levels with the needs of migrating fish populations, seven pilot hatch operating protocols (HOPs) have been developed as part of the STrategic REstoration And Management (STREAM) project. This paper outlines the generic guidance that has been developed and the lessons that have been learnt to date, which it is hoped will be useful in developing structural operating protocols in catchments throughout the UK.

Keywords

operating protocol; River Avon; Site of Special Scientific Interest (SSSI);
structures; water level management