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River Habitat Survey

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Title: River Habitat Survey Author: Environment Agency Last modified by: mnaura Created Date: 5/7/1998 1:07:54 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

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Title: River Habitat Survey


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Uses and Applications
  • Marc Naura Mark Diamond
  • RHS Lead Region

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River Habitat Survey
?
?
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Aims
  • A standard field methodology

objective
statistically robust
widely applicable
practicable target time, 1 hour
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Objective
No perceptible flow in deeper pool
Bar bar exposed under low flows
Unbroken standing waves observed as shallow flow
over riffle
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Statistically robust
  • Between surveyor variability reduced
  • simple choices
  • tests on different river types

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Widely applicable
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RHS form Two main sections
  • SPOT-CHECKS
  • SWEEP-UP

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Features recorded
  • EROSION
  • eroding/stable cliffs
  • DEPOSITION
  • side/point/mid channel bars
  • VEGETATION STRUCTURE
  • channel banks
  • FLOW
  • 10 Flow types

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Other features
  • BANK PROFILES
  • natural undercut...gentle
  • modified resectioned..embanked
  • TREES
  • extent associated features
  • CHANNEL FEATURES
  • waterfall,riffles/pools etc.
  • boulders, exposed sediment
  • LAND USE (50m)
  • 13 land use categories

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Management features
  • MANAGEMENT
  • resectioning/reinforcement
  • poaching (trampling)
  • ROADS BRIDGES
  • FLOW REGULATION
  • weir/sluices/culverts

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Baseline survey network
From 1994 to 1996
England and Wales 4569 sites Scotland 779
sites Northern Ireland 266 sites
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Habitat modification score (HMS) categories 0
Pristine 0 - 2 Semi-natural 3 - 8
Predominantly unmodified 9 - 20 Obviously
modified 21 - 44 Significantly modified 45 or
more Severely modified Footnote semi-natural
includes pristine channels
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Exampleassessment of Lowland low energy site
with an HQA65
Distribution of HQA for nearest neighbour sites
on PCA map
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Application Scales
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Flood Defence Obectives
Fisheries Obectives
Flood Defence issue Channel capacity
Fisheries issue No fish
Catchment Issue Accelerated Erosion
Local authorities Issues
Anglers Issues
Local Authorities Agenda
Anglers Agenda
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Aims
  • Prioritise management
  • Integrate function management for Catchment
    Issues
  • Identify catchment issues
  • Define strategy tailored to catchment and
    management needs
  • Treat problem at source

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Prioritise management
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Habitat Quality Modification in England Wales
  • Uses Global overview, Leaps, Other local
    applications

HQA
HMI
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LEAP QUALITY ASSESSMENT
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Identify catchment issues
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Catchment scale applicationThe Sankey Now Project
n125
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Management impact
n 125
n 4569
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Determining a Sub-set of Similar Reference Sites
High energy
Low energy
Low altitude/Low slope
High altitude/High slope
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n 125
n 277
n 4569
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Gen. Info Landuse in the Sankey Catchment
  • Wooded
  • Agricultural
  • Semi-rural
  • Urban

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Define strategy tailored to catchment and
management needs
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  • Fisheries interest in riffle rehabilitation
  • first choice
  • River Weaver

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Criteria Used to Assess Rehabilitation Potential
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Sites with Rehabilitation Potential
  • RHS Sites
  • Potential general rehabilitation
  • Potential rehabilitation for fisheries

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Black BrookSite Prior toRehabilitation
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Work in Progress at the Black Brook Site
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Test catchment issues
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Silt deposition on the Nadder Catchment
  • Erosion Indicators
  • Depositional Features
  • Fine Sediment Source Index

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Erosion Indicators
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Depositional Features
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Fine Sediment Sources
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Conclusion
  • Catchment in a stabilising state
  • Potential for erosion
  • Fine sediments from land use run-off

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Fisheries Habitats
  • Habitat suitability model for
  • Salmon and Trout Fry
  • Trout Parr
  • Salmon Parr
  • Salmonid spawning habitat

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Suitable Salmonid Habitats

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Potential Management Issues
  • Land-use and riparian vegetation
  • River connectivity

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Treat problem at source
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RHS Contribution to the Mersey Flood Alleviation
Scheme
100 Resectioned bermed, straightened,
widened, predominant glide, silty substrate
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Removing Fine Sediments From Banks and Berms
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Erosion
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Predicting species distribution
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Distribution of R. Nidd Coarse Fish Communities
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SubstrateDistributionon the Nidd
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Predicted Community Types in Yorkshire Rivers
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Developments
  • RHS database 3.2
  • Water Framework Directive
  • RHS in Europe
  • Educational CDROM
  • Corporate plan
  • setting habitat targets for 2002/2003

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River Habitat Survey Lead Region
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Service Level Agreement
  • Input of datafree of charge!
  • Queries
  • Methodological advice
  • Database management and training
  • Development of applications
  • Quality Assurance

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Quality control Our role
  • 4 levels
  • Visual check at receipt of form
  • Logical checks on all sites and surveyors
  • Random checks on forms photos
  • Specific checks (site visit, hydrographs)
  • Check on all trainers
  • New surveyors
  • thorough check of first 10 sites

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Future
  • 2004-2006 National survey (4500 sites)
  • Catchment survey for Habitat Quality Targets
  • Catchment survey for Leaps
  • RHS on the Internet
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