How do conservation moorings affect my permit application?

Rules differ by country and jurisdiction, so we do not promise an outcome. A conservation mooring has no excavation, no spoil and no chain sweeping the bottom, so there is far less habitat impact to document than for a block and chain. We supply the installation records, torque logs and system specification, and if you talk to us early we tell you what your authority is likely to ask for.

How does a conservation mooring protect eelgrass?

A ground chain sweeping the bottom keeps a bare ring around every mooring and can dig hollows where seagrass struggles to grow back. A conservation mooring has only the anchor head at the seabed and a floating rope above it, so nothing sweeps the bottom and the ring is free to re-vegetate. Our environment page shows how, with photographs from a meadow.

How does a fixed-point mooring increase vessel density?

A screw anchor holds as a fixed point on a much shorter line, roughly 2:1 instead of 5:1, so each boat swings through a smaller circle. How many more berths that buys depends on your depth, vessel mix and layout; send your chart and current mooring count and we will work it through with you.

Marina & harbor moorings

Conservation Moorings for Marinas & Harbors

Conservation moorings on screw anchors hold as a fixed point: no block to drag into boats in a storm, no chain scouring the eelgrass, and a tighter swing circle, so more boats fit in the same licensed mooring field.

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One mooring, in plan, at 6 m depth

Block and chain39 m

Screw anchor20 m

Water each mooring occupies, in this example73% less

Try other depths

Every mooring owns a circle of water. Shrink the circle.

A block-and-chain mooring needs a long line from anchor to buoy, and the boat swings through all of it. A screw anchor holds as a fixed point on a shorter line, so the circle is tighter and no ground chain sweeps the bottom inside it.

Water depth at the mooring

3 m6 m12 m

Water each mooring occupies, in this example73% less

Block and chain39 m swing radius

Screw anchor20 m swing radius

Swing circle, block and chainSwing circle, screw anchorGround-chain sweep (bare seabed)

Illustrative geometry, not a site design. Your chart decides the real layout.

How this is drawn

Line length is scope (line length ÷ depth) × depth: 5:1 for block and chain, 2:1 for a screw anchor. Swing radius is the line’s horizontal reach plus a 10 m vessel. The chain-sweep disc shows where the damage happens, not a measured extent. Catenary, tide range and current are ignored.

On record at Pınar Hotel, Erdek

Photographs from the 2021 job: Posidonia oceanica seagrass growing around the head of an anchor that is in service as a boat mooring, noble pen shells (Pinna nobilis) — a species listed as critically endangered — in the same meadow, and the drive rig on the day. The job itself was shallow-water anchoring for floating docks and boat moorings, not a conservation-mooring field.

The head of a screw anchor at the seabed, surrounded by Posidonia oceanica seagrass, with its mooring rope tied on at the lower left. — Anchor head in a Posidonia oceanica meadow · Pınar Hotel, ErdekInstalled 2021 · In service as a boat mooring · Mooring rope tied on at lower left

Several noble pen shells (Pinna nobilis) standing upright in the seagrass on the seabed at the same site. — Pinna nobilis in the same meadow · Pınar Hotel, ErdekSame site as the 2021 installation

Crew on a work vessel lowering a hydraulic drive rig to install screw anchors in shallow water off Pınar Hotel, Erdek. — Drive rig lowered from a work vessel · Pınar Hotel, ErdekInstalled 2021 · Floating-dock and boat-mooring anchors

Screw Anchors for Floating Docks in Shallow Water

Pınar Hotel · Erdek, Balıkesir, Türkiye · 2021

The site: The hotel needed to secure floating docks in shallow water at a site that is exposed to wind and waves at certain times of year. Concrete deadweights were ruled out on two counts: the exposure, and the shallow depth — blocks heavy enough to hold would have protruded.
What we installed: Fourteen screw anchors 2 m long with 60 cm helical plates were installed into loose sand to hold the dock system, each rated to a 4.3 t safe working load established by on-site pull testing. Four further anchors were set in the deeper part of the site to serve boat moorings.
Where it stands: All anchors were installed and rated to their design load, with the safe working load confirmed by pull testing on site. The hotel deferred installing the docks themselves, but brought the deeper-water moorings into service for boats.

Anchors: 18
Shaft length: 2 m
Helix diameter: 60 cm
Safe working load: 4.3 t

Every figure is taken from the installation record for this job.

How a conservation mooring holds

A conservation mooring is three parts: a screw anchor set into the seabed, a floating rope, and a buoy. The anchor holds by bearing its helix plates against the soil above them, not by its weight, and you get its torque record for every mooring.

What harbor masters ask before they commit

Find out how many moorings your water can hold

Send your harbor chart, current mooring count and permit conditions. An engineer replies within 24 hours with questions and a first read; the full proposal follows within two business days.

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