Sussex Wetland Conference: Nigel Holmes

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Sussex Wildlife Trust

Nigel Holmes Chalk Streams Sussex Wetland Conference

Tecnologia Saúde e medicina

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

Non-Chalk Rivers

Impervious (Clay) Geology = low BFI = ‘Flashy’ Flow

Mixed Geology with Chalk - Perennial Rivers

Mixed Clay/Chalk Geology = high BFI = Stable Flow with Bigger Troughs and Higher Peaks

Natural Chalk Rivers/Stream often ‘Winterbournes’

Sussex Chalk Streams: Distribution &
Resource

Sussex Chalk Streams: Are there more Fran asks!!?

Scarp Streams –
many
woodedbanks and
woody debris
features

Scarp Streams
– Special
Character:
PROTECT

Some Scarp Streams
– V Special
Character: PROTECT

Some Not So
Special
Character:
REHABILITATION
POTENTIAL

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

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Sussex Wetland Conference: Nigel Holmes

1. Chalk Streams of Sussex: Recognition, Protection & Enhancement Nigel Holmes & Fran Southgate: January 2012

2. 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

3. What are chalk streams? Official ‘BAP’ National Resource Reflects Chalk Geology Ems & Lavant only Sussex ones identified

4. Perennial Chalk Rivers Chalk Geology = V V high BFI = V V Stable Flow

5. Non-Chalk Rivers Impervious (Clay) Geology = low BFI = ‘Flashy’ Flow

6. Mixed Geology with Chalk - Perennial Rivers Mixed Clay/Chalk Geology = high BFI = Stable Flow with Bigger Troughs and Higher Peaks

7. Natural Chalk Rivers/Stream often ‘Winterbournes’

8. NATURALLLY Winterbourne

9. NATURALLLY Winterbourne

10. NATURALLLY Winterbourne

11. NATURALLLY Winterbourne

12. NATURALLLY Winterbourne

13. NATURALLLY Winterbourne

14. NATURALLLY Winterbourne