1. Improving Fish Passage on the River Almond
Feasibility and Optioneering Study
Public Information Meeting
22 September 2018

2. Project Phases: Work to date: Atkins 2010/11
Mott MacDonald survey work 2014
Current phase:
Atkins feasibility and optioneering report
Next phase:
Design of agreed options
Construction works
Overview of the phases of the project as a whole
22 September 2018

3. Existing Information:
Sediment Sampling
Flood Risk Assessment (where removal considered)
Structural Condition Inspection
Geomorphology Surveys
Ecological Constraints Surveys
Fisheries Data
Topographic Surveys
Utilities Searches
22 September 2018

4. Selection of Preferred Option
Data Collection
Optioneering
Selection of Preferred Option
August 2015
Design
Construction
22 September 2018

5. Data collection that we will be carrying out...
- Site Visits
- Desk Study of the survey results
Stakeholder Engagement
Potential aquatic habitat and ecology site visits
ecology surveys, riverbank and bed surveys, the silt properties, structural condition of structures, and the lie of the land and services in the area
22 September 2018

6. Optioneering – Summary of Options
Full Removal
Partial Removal
Bypass Channel
Rock Ramp
Formal Fish Pass (Larinier)
Formal Fish Pass (Pool and Weir)
Fish Passage Easement
Generic Examples of Options...
22 September 2018

7. Full Removal Cons Pros Difficult access for large removal works
Potential risk to any adjoining structures
Changes to upstream river channel
Pros
Full river connectivity and passage for all fish species
Restore natural sediment movement
Before
After
22 September 2018

8. Partial Removal
Pros
Partial river connectivity and passage for all fish species
Helps to restore natural sediment movement
Cons
Difficult access for large removal works
Potential risk to any adjoining structures
Risk to the structural integrity to the remaining structure
Changes to upstream river channel
Source: FAO/DVWK, 2002
22 September 2018

9. Bypass Channel Cons Difficult access for large removal works
Pros
River connectivity and passage for all fish species
Helps to restore natural sediment movement
Minimal works to the existing structure
Cons
Difficult access for large removal works
Requires a lot of space around the structure
22 September 2018

10. Rock Ramp
22 September 2018

11. Pros Cons Fitted to existing structures
Relatively low cost
Improved passability for priority species
Cons
Difficult access for construction works requiring large plant
Passage would be centred on salmonids, with less improvement for other species
Source: FAO/DVWK, 2002
22 September 2018

12. Fish Pass Designs – ‘Larinier’
Town Weir, Haverfordwest
Louds Mill, River Frome, Dorset
Aberdulais, River Neath
Fiskerton, Nottinghamshire
22 September 2018

13. Formal Fish Pass
Pros
High performance fish pass for salmonids and other large migratory fish
Good resilience to flood conditions
Cons
Often large construction works – difficult access
High cost
22 September 2018
Vertical Slot Fish Pass, River Taff, South Wales
Pontymoel Fish Pass, River Llwyd, South Wales

14. Fish Pass Designs – ‘Pool and Weir’
Duddington, Northamptonshire
Osbaston, Monmouthshire
22 September 2018

15. ‘Pool and Weir’ Fish Pass
Pros
High performance fish pass for wide range of species
Good resilience to flood conditions
Cons
Often require very large structures
Difficult access for large construction works
High cost
22 September 2018

16. Fish Pass Designs – ‘Easement’
Davidston Burn, Moray
Pre-barrages fixed to river bed downstream of existing weir
Before
After
22 September 2018

17. Pros Cons River Lugg, Herefordshire Fitted to existing structures
Large variety of options
Relatively low cost
Improved passability for priority species
Cons
Difficult access for construction works requiring large plant
Easement would be centred on salmonids, with less improvement for other species
River Lugg, Herefordshire
Timber baulk
Fixed diagonally onto the downstream face of the weir
Provides suitable flow of water to enable fish to swim up and over the structure
22 September 2018

18. Thank you
If you’d like to be kept updated with the project please include your contact details on your feedback form and post it in the box on your way out
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22 September 2018