sussex wetland conference: nigel holmes
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Nigel Holmes Chalk Streams Sussex Wetland ConferenceTRANSCRIPT
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Chalk Streams of Sussex: Recognition, Protection &
Enhancement
Nigel Holmes & Fran Southgate: January 2012
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Planned Coverage•What are chalk streams?•Characteristics and Natural Variation•What do they typically look like?•Sussex chalk rivers – resource and distribution•What do Sussex chalk streams look like?•Anything special about them?•PROTECTION REQUIRED.•REHABILITATION REQUIRED•Examples of chalk stream rehabilitation
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What are chalk streams? Official ‘BAP’ National Resource
Reflects Chalk Geology
Ems & Lavant only Sussex ones identified
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Perennial Chalk Rivers
Chalk Geology = V V high BFI = V V Stable Flow
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Impervious (Clay) Geology = low BFI = ‘Flashy’ Flow
Non-Chalk Rivers
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Mixed Clay/Chalk Geology = high BFI = Stable Flow with Bigger Troughs and Higher Peaks
Mixed Geology with Chalk - Perennial Rivers
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Natural Chalk Rivers/Stream often ‘Winterbournes’
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NATURALLLY Winterbourne
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NATURALLLY Winterbourne
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NATURALLLY Winterbourne
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NATURALLLY Winterbourne
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NATURALLLY Winterbourne
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NATURALLLY Winterbourne
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NATURALLLY Winterbourne
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NATURALLLY Winterbourne
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Perennial Chalk Streams - Meon
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Perennial Chalk Streams – Lambourn
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Perennial Chalk Streams – Kennet
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Perennial Chalk Streams – Itchen
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Sussex Chalk Streams: Distribution & Resource
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Sussex Chalk Streams: Distribution & Resource
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Sussex Chalk Streams: Are there more Fran asks!!?
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Sussex Chalk Streams: Bosham
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Sussex Chalk Streams: Bosham
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Sussex Chalk Streams: Bosham
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Scarp Streams - Arundel
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Scarp Streams – many
woodedbanks and woody debris
features
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Scarp Streams - Dynamic
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Scarp Streams -
Sutton
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Scarp Streams – Special
Character: PROTECT
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Some Scarp Streams – V Special
Character: PROTECT
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Some Not So Special Character: REHABILITATION
POTENTIAL
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Key Quality Parameters
Morphology/Shape/Naturalness
Quality of Water Present
Amount of Water: Target!!
Biological and
other
Interactions
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Rehabilitation needed and can be easy
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Rehabilitation needed and can be easy:
just move bed materials
around – Undo Historical
‘Flattening’!!!
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Rehabilitation needed and can be easy:
just ‘Un-flatten’
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Rehabilitation needed and can be easy:
but need help in promotion through keen & pioneering landowners
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Rehabilitation needed and can be easy: need
keen & pioneering landowners and
vision
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Examples of Rehabilitation
on Small Chalk Streams
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Examples of Rehabilitation on Small Chalk Streams
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Examples of Rehabilitation on Small Chalk Streams
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Examples of Rehabilitation on
Small Chalk Streams
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Examples of Rehabilitation on Small Chalk Streams
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Examples of Rehabilitation on Small Chalk Streams
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Thanks & Keep up the Good Work