Case study:The Mid River Crane - Aquatic Refuge Identification Plan

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Location: 51° 28' 16.41" N, 0° 24' 44.39" W

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Project overview

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Status	Planned
Project web site	http://cranevalley.org.uk/
Themes	Fisheries, Habitat and biodiversity, Urban
Country	England
Main contact forename	Gareth
Main contact surname	Ryman
Main contact user ID
Contact organisation	London Wildlife Trust
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This is a parent project encompassing the following projects

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Project summary

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Aquatic Refuges

Aquatic refuges are physical places within a river corridor that allow populations of aquatic organisms to persist during times of disturbance. Disturbances experienced by the River Crane include sudden increases in flow and river levels, minor flooding, and pollution events. The organisms harboured in a refuge are able to re-colonise the main river when the disturbance has passed.

Importance of Aquatic Refuges for heavily modified water bodies

Anthropogenic alterations to the flow regime and floodplain connectivity of lowland rivers have been observed to have detrimental impacts on fish populations (Bolland, 2008). The River Crane is a heavily modified water body with poor connectivity to its floodplain. In unmodified lowland rivers, floods are characterized by lateral expansion onto floodplains resulting in high levels of habitat heterogeneity, essential for fish refuge, spawning, nursery and feeding (Bolland, 2008).

Cowx & Gerdeaux (2004) suggested the necessity of recreating functional habitats for spawning, feeding, nursery(growth) and resting (self protection) on heavily modified river channels. Recreating these types of habitats involves softening levees and reconnecting secondary channels (backwaters) and isolated oxbows (Lusk et al., 2001, 2003). Such restoration efforts may only be necessary in limited reaches of a river corridor to maintain the biodiversity of a fishery (Cowx & Welcomme, 1998).

Aim of this project

This report aims to assess feasibility of creating aquatic refuge areas along the mid-Crane (between Crane Park and Cranford Park) in order to create functional habitats for coarse fish spawning, feeding, nursery and resting. Some sites may also have the potential for habitat enhancements for water voles and aquatic invertebrates. Sites are ordered via location, downstream to upstream.

References:

Bolland, J.D. (2008). Factors affecting the dispersal of coarse fish. Thesis submitted for the degree of doctor of philosophy. The University of Hull. Cowx, I.G. & Gerdeaux, D. (2004). The effects of fisheries management practices on freshwater ecosystems, Fisheries Management and Ecology 11, 145-152. Cowx, I.G. & Welcome, R.L. (1998). Rehabilitation of Rivers for Fish. Oxford: Fishing News Books, Blackwell Science, 260 pp. Lusk, S., Halacka, K. & Luskova, V. (2003) Rehabilitation the floodplain of the lower River Dyje for fish. River Reseach and Applications. 19, 281-288 Lusk, S., Halacka, K. & Luskova, V. & Horak, V. (2001). Annual dynamics of the fish stock in a backwater of the River Dyje. Regulated Rivers: Research and Management 17, 571-581.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Thames River basin London Subcatchment River name Crane (including part of the Yeading Brook) Area category 10 - 100 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 5151 m <br />0.051 km <br />5,100 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106039023030 Other case studies in this subcatchment: Big Yellow, Crane Park, Cranford Park Phase 2, Hospital Bridge Road, Mill Road Weir, Re-connecting Meanders at Cranebank on the River Crane Site Edit site Name WFD water body codes GB106039023030 WFD (national) typology Calcareous WFD water body name Crane Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Urban 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 2014/01/01 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 Hydromorphology Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Creation of fish refuge areas, Introduction of spawning gravels, Habitat restoration 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 Aquatic Refuge Identification Plan Fisheries Impact Assessment Additional links and references Edit links and references Link Description http://http://homepage.ntlworld.com/borsuk/force/FORCEhome.html Friends Of the River Crane Environment http://http://cranevalley.org.uk/ Crane Valley Partnership Supplementary Information Edit Supplementary Information