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EFM Projects and Trials

Information on projects and trials of Environmentally Friendly Moorings (EFMs).

The map below shows the locations of trials and EFMs that we have been made aware of. Trials of EFMs for use as vessel moorings have taken place in areas including Lundy, Mylor Yacht Harbour, Calstock (River Tamar), Cawsand, Salcombe, Torbay (Fishcombe Cove, Brixham), and the Isle of Man. EFMs have been used as marker buoys at Studland and the Helford River. While a few failures have occurred, there have been many successful trials, some of which have been running for a number of years. For example, three EFMs have been in operation in Lundy since 2004. 

If you are involved in a trial, or use an EFM that is not listed here, please fill in the form at the bottom of the page to add the details to our dataset. This information would be gratefully received to help share experiences and ensure these pages are a comprehensive and valuable resource for users.

Overview Map

 


 

Further information on specific moorings

Please click the relevant trial/ project below to open further information. 

Garwick Bay, Isle of Man

GarwickBayEFM
EFM at Garwick Bay, Isle of Man © Bryan Gullan


Mooring(s) information

  • Location: Garwick Bay, Isle of Man
  • Type: modified Hazelett system
  • Status: current (seasonal)
  • Ownership: private
  • Purpose: Vessel mooring (20' sailing boat)
  • Date Installed: 2009
  • Date removed: N/A

Environmental conditions

  • Max water depth: 10 m
  • Tidal range: 7m
  • Conditions: open bay location sheltered from prevailing (summer) SW winds; exposed to wind from other directions. General tidal movement with some back eddies into the bay.
  • Substrate/ habitat: sand / rock

Maintenance

  • Maintenance type: Regular inspection from dinghy (lifting buoy & riser manually). Lower section to seabed inspected from dinghy using bathyscope. Occasional inspection by diver to check block and riser fitting.
  • Schedule: The mooring has been inspected and the riser cleared of weed growth on a fairly regular basis during the seasonal periods when in use – approx. 4 week intervals – and when used for boat mooring. When there is no boat on the mooring, inspection is less frequent – approx. bi-monthly. It has been found useful to clear weed growth, etc, from the riser so as to allow the spar buoy to float higher relative to the surface although this has not caused excessive problems. ‘Twist’ in the riser has caused some degradation to the outer casing – current modification to the system is being trialled to eliminate this problem.

Additional Details

Summer use only – due to the nature of its use as a mooring for a private pleasure craft, this mooring is only used during the summer months (approx.. May-September) although testing to date indicates that use at all times of year is quite feasible.

Maximum wind exposure experienced to date - est. F5.

Summary Report

Contact Details

Fishcombe Cove, Torbay, Devon

TorbayEFM
EFM being installed, Torbay © Mark Parry


Mooring(s) information

  • Location: Fishcombe Cove, Torbay
  • Type: Modified swing mooring with additional floats
  • Status: Current with further moorings in same location proposed
  • Ownership: Visitor mooring
  • Purpose: Vessel
  • Date Installed: March 2017
  • Date removed: N/A

Environmental conditions

  • Max water depth: 4.1 m
  • Tidal range: 5.32 m
  • Conditions: Sheltered bay
  • Substrate/ habitat: Sediment/ mud near seagrass bed

Maintenance

  • Maintenance type: Unknown
  • Schedule: Unknown

Additional Details

Stirling Mooring Style

Contact Details

Salcombe Harbour, Devon

SalcombeEFM
EFM at Salcombe © Mark Parry


Mooring(s) information

  • Location: Salcombe Harbour, Devon
  • Type: Modified swing mooring with additional floats
  • Status: Current with further moorings in same location proposed
  • Ownership: Private mooring
  • Purpose: Vessel mooring
  • Date Installed: 2014
  • Date removed: N/A

Environmental conditions

  • Max water depth: 0.8 m
  • Tidal range: 5.26 m
  • Conditions: Sheltered estuary with strong tidal currents
  • Substrate/ habitat: Intertidal seagrass

Maintenance

  • Maintenance type: Unknown
  • Schedule: Unknown

Additional Details

Stirling Mooring Style

Presentation by Nigel Mortimer

Contact Details

Cawsand Bay, Southeast Cornwall

CawsandsEFM
EFM at Cawsands © Mark Parry


Mooring(s) information

  • Location: Cawsand Bay
  • Type: Modified swing mooring with additional floats
  • Status: Current with further moorings in same location proposed
  • Ownership: Private mooring
  • Purpose: Vessel mooring
  • Date Installed: 2015
  • Date removed: N/A

Environmental conditions

  • Max water depth: 2.8 m
  • Tidal range: 5.4 m
  • Conditions: Sheltered bay
  • Substrate/ habitat: Sub-tidal seagrass

Maintenance

  • Maintenance type: Unknown
  • Schedule: Unknown

Additional Details

Stirling Mooring Style. Privately maintained. 

Presentation by Beth Siddons

Contact Details

Helford River, Cornwall

Mooring(s) information

  • Location: Helford River (three marker buoys situated between Toll point and Durgan)
  • Type: Modified existing mooring - rope with midway submerged buoy to keep the slack line off the seabed
  • Status: Current
  • Ownership: N/A
  • Purpose: Markers
  • Date Installed: March 2017
  • Date removed: N/A

Environmental conditions

  • Max water depth: Unknown
  • Tidal range: Unknown
  • Conditions: Unknown
  • Substrate/ habitat: Subtidal seagrass

Maintenance

  • Maintenance type: Lifting and inspection
  • Schedule: Annually

Additional Details

N/A

Contact Details

Calstock (River Tamar) and Cawsand Bay, Cornwall

Mooring(s) information

  • Location: Calstock (River Tamar) and Cawsand Bay, Cornwall
  • Type: Helical
  • Design: Helical screw pile replaces concrete block and scrub chain. Testing is also being completed on soft risers, and modelling underway for possibility of more efficient mooring field design.
  • Status: In place
  • Ownership: Private
  • Purpose: Anchor replacemnent
  • Date Installed: 20/04/2018
  • Date removed: N/A

Environmental conditions

  • Max water depth: 7.0 m
  • Tidal range: 5.0 m
  • Conditions: Range of conditions and depths from 1m to 4m at LAT. High current flow in in ebb and flood conditions up to 2.5 knots. Range of salinity.
  • Substrate/ habitat: Firm shale substrate in shallow water. Mud in deeper water. Test area only for corrosion and performance appraisal.

Maintenance

  • Maintenance type: Product has been developed to deploy and recover helical screw mooring from the surface in depths up to 4m. Each screw pile can be effectively removed and redeployed from surface. Underwater camera equipment in use to monitor deployment and removal.
  • Schedule: At present they are being monitored on a weekly basis for research purposes. Once concluded the research will inform the planned maintenance - intention however would be an annual check.

Additional Details

The work is being conducted in conjunction with Plymouth University with a number of objectives. 1. Cost effective riser design 2. Empirical uplift calculations to best match use to deployment specification (data on a variety of boat slip, windage and shock loads is currently being collected. 3. Life cycle analysis of the mooring. By the end of spring 2018, up to 20 helical screw moorings will be in place with a variety of risers for study and appraisal.

Contact Details

  • Contact: Chris Pollard
  • Phone: 07398 774799
  • Email: info@tradewindmarine.co.uk
  • Website: http://tradewindmarine.co.uk
Mylor Yacht Harbour, Cornwall

Mooring(s) information

  • Location: Mylor Yacht Harbour, Cornwall
  • Type: Seaflex
  • Status: Unknown
  • Ownership: Unknown
  • Purpose: Unknown
  • Date Installed: 2005
  • Date removed: 2005

Environmental conditions

  • Max water depth: <2 m
  • Tidal range: ~6 m
  • Conditions: Unknown
  • Substrate/ habitat: Unknown

Maintenance

  • Maintenance type: Unknown
  • Schedule: Unknown

Additional Details

N/A

Contact Details

  • Contact: Unknown
  • Phone: Unknown
  • Website: Unknown
Lundy Island

Mooring(s) information

  • Location: Lundy Island
  • Type: Seaflex x 3
  • Status: Unknown
  • Ownership: Visitor and private
  • Purpose: Vessel moorings
  • Date Installed: 2004
  • Date removed: N/A

Environmental conditions

  • Max water depth: 14 m
  • Tidal range: 9 m
  • Conditions: Unknown
  • Substrate/ habitat: Unknown

Maintenance

  • Maintenance type: Unknown
  • Schedule: Unknown

Additional Details

One mooring removed after three years due to failure from lack of maintenance, but trial still ongoing successfully and maintenance measures put in place. 

Contact Details

Studland Bay, Dorset

Mooring(s) information

  • Location: Studland Bay, Dorset
  • Type: Seaflex rodes with helix helical anchors
  • Status: Trial completed
  • Ownership: N/A
  • Purpose: Markers for Voluntary No Anchor Zone (not EFM trial)
  • Date Installed: 2009
  • Date removed: 2011

Environmental conditions

  • Max water depth: 3 m
  • Tidal range: 6 m
  • Conditions: Sheltered bay
  • Substrate/ habitat: Subtidal seagrass

Maintenance

  • Maintenance type: Unknown
  • Schedule: Unknown

Additional Details

The focus of this project was the results of the implementation of the No Anchor Zone and not a trial of the use or impact of the eco-mooring type marker buoys. 

The Crown Estate Mooring Viability Appraisal

Contact Details

Note: The information provided above is that given to us by the contact listed. We are not responsible for any inaccuracies in the information.




 

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