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