Case study:Reconnecting the Rivers

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Location: 52° 0' 19.58" N, 3° 15' 42.57" W

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Project overview

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Status	In progress
Project web site	http://www.wyeuskfoundation.org/projects/reconnecting.php
Themes	Environmental flows and water resources, Fisheries, Habitat and biodiversity, Land use management - agriculture, Land use management - forestry, Monitoring, Water quality
Country	England, Wales
Main contact forename	Stephen
Main contact surname	Marsh-Smith
Main contact user ID
Contact organisation	Wye & Usk Foundation
Contact organisation web site	http://www.wyeuskfoundation.org/
Partner organisations
Parent multi-site project	WHIP , pHish , UP! , Leader+ , Lugg & Arrow, Radnor Foal
This is a parent project encompassing the following projects	No

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Project summary

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Our first walk over survey of the upper Wye (1995/6) showed that over 50% of all available spawning habitat for salmon (by area) and over three quarters of trout spawning habitat was barred to ascending fish. A combination of neglect and poor regulation had allowed weirs, badly designed crossing points and road culverts to be built without the requirement for free passage of fish. These were the main culprits but huge debris dams had also formed on an alarming number of tributaries, completely sealing off hundreds of kilometres of essential spawning and nursery habitat. For salmon this was disastrous and the main cause of their decline, particularly the loss of the Lugg and its tributaries in the 1980s.

Small populations of brown trout remained above the blockages but the larger main channel residents, which provided the bulk of the egg deposition, were prevented from reaching the ideal (smaller) sized tributaries. The extent of the decline of brown trout as indicated by juvenile densities was even greater than that of salmon in the Wye by 1996.

Between 1996 and 1997 the Foundation embarked on a programme to reopen the tributaries of the upper Wye. The experience of the Tweed, North Esk and elsewhere showed that this is the single most cost effective way of increasing fish populations. The programme took two years, including surveying, and reopened 132km of salmon and 330km of trout spawning areas. Since then, the work has continued and as of 2013, there are just a few sites on the lower Usk, Wye and Lugg that require fish passes.

After this initial effort, the Foundation has continued opening or reopening Wye and Usk streams and rivers in the projects: WHIP , pHish , UP! , Leader+ , Lugg & Arrow, Radnor Foal and ART/Defra. The current and historical situations are detailed on the maps below which show the extent of the Wye and Usk catchment upstream that was blocked to migrating fish in 1972.

THE LUGG & ARROW

The Lugg and Arrow (the Wye's largest tributary system) had numerous barriers, built in the 18th and 19th centuries to control flooding and erosion, and to provide a water supply for agriculture and milling. Until the early 1980s, the catchment was accessible enough to enable up to 3,000 salmon redds to be recorded in a winter. However, in 1982 the Leominster Flood Alleviation Scheme sealed off the Lugg and the run dwindled to a few persistent pairs of salmon. This was partially corrected with a modern Larinier fish pass built at Hampton Court in 2003 and with two passes at Leominster in 2004.The next phase was to secure full access over the historic weirs and this will be completed in 2013.

USK

In 2004 we turned our attention to the Usk and found that while the river above Brecon is mainly unobstructed, the catchment from Brecon to Abergavenny is as bad as on the upper Wye in 1995 with every major tributary having at least one serious obstruction. Our tour de force was the construction of a fish pass in 2006 on the Cynrig – a stream that collects its rainfall from the steep slopes at the top of the Brecon Beacons.

Milestones in improving Wye and Usk fish access:

• 1996/7 Upper Wye Access Project.

• 2000 Flood washes out Skenfrith weir, Monnow

• 2003 pHish project - 7 fish passes.

• 2003 Hampton Court fish Pass opened R Lugg by EA Wales.

• 2004 Lugg Flood alleviation scheme fish passes (EA Wales).

• 2004 UP! Project: Cilieni Weir removed.

• 2006/8 Lugg and Arrow: 12 fish passes completed.

• 2006 Cynrig fish pass completed and weir removed Menasgin.

• 2008 Osbaston Fish Pass (Monnow) and lower Arrow passes completed.

• 2010 Four more fish passes completed on Arrow to take fish above Kington. Three Lugg fish passes modified by EAW below Kingsland. Modifications and removals on the Garren.

• 2011 EA Wales breaches and removes the weir at Kentchurch, opening up a huge spawning area on the Monnow system as a result.

• Weirs lowered on the Afon Lwyd (Usk tributary)

• 2011 Further improvements to upper Lugg and Arrow access with 8 more fish passes.

• 2012 Easements completed at Ffrwd, Berthin, Rhyd Y Meirch (Usk)

• 2013 Passes at Downfield and Mahollam (Arrow) completed and temporary easement at Dayhouse (Lugg).

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started 1995/01/01 Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Barriers to fish migration Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Creation of fish passes, Removal of blockages Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information