Coastal and Wave Overtopping

Following the tidal flooding experienced at the beginning of 2014, the Department of Infrastructure engaged a specialist engineering consultancy to develop concept options for flood and storm protection. The work focused on the Department's assets at known problem areas, mainly around the Island's ports.

The main findings of the review are captured in the Executive Summary, which is attached below. The full report is also available.

The options identified would involve significant capital investment by Government and in some cases would have a visual impact on the locations concerned. The Department is planning to undertake a period of community engagement before deciding what steps to take next.

Project Documents

Appendix A - Design Input Statement

Appendix B - Concept Design Drawings

CastletownHarbourOpen Coast
C-H-DR-C-01 Concept C-OC-DR-C-01 Concept
C-H-DR-C-01 Concept C-OC-DR-C-02 Concept
C-H-DR-C-01 Concept
DouglasHarbourOpen Coast
D-H-DR-C-01 Concept D-OC-DR-C-01 Concept
D-H-DR-C-02 Concept D-OC-DR-C-02 Concept
D-H-DR-C-03 Concept D-OC-DR-C-03 Concept
GanseyHarbourOpen Coast
none G-OC-DR-C-01 Concept
G-OC-DR-C-02 Concept
LaxeyHarbourOpen Coast
L-H-DR-C-01 Concept L-OC-DR-C-01 Concept
L-H-DR-C-02 Concept L-OC-DR-C-02 Concept
PeelHarbourOpen Coast
P-H-DR-C-01 Concept P-OC-DR-C-01 Concept
P-H-DR-C-02 Concept P-OC-DR-C-02 Concept
Port St
Mary
HarbourOpen Coast
PSM-H-DR-C-01 Concept None
PSM-H-DR-C-02 Concept
RamseyHarbourOpen Coast
R-H-DR-C-01 Concept R-OC-DR-C-01 Concept
R-H-DR-C-02 Concept R-OC-DR-C-02 Concept
R-H-DR-C-03 Concept

Appendix C - Modelling Report

Appendix D - Design Technical Notes

CastletownHarbourOcean Coast
CH1 - Raised Harbour Walls COC1 - Raised Sea Wall
CH2 - Set Back Walls COC2 - Set Back Wall
COC3 - Rock Revetment
DouglasHarbourOcean Coast
DH1 - Raised Harbour Walls DOCA1 - Set Back Wall
DH2 - Set Back Walls DOCA2 - Raised Sea Wall
DOCA3 - Beach Recharge
DOCB1 - Rock Revetment
DOCB2 - Xbloc Revetment
GanseyHarbourOpen Coast
none GOC1 - Rock Revetment
GOC2 - Xbloc Revetment
GOC3 - Raised sea wall
LaxeyHarbourOpen Coast
LH1 - Raised Harbour Walls LOC1 - Set Back Wall
LOC2 - Raised sea wall
LOC3 - Rock Revetment
PeelHarbourOpen Coast
PH1 - Raised Harbour Walls POC1 - Rock Revetment
PH2 - Set Back Walls POC2 - Set Back Wall
Post St
Mary
HarbourOpen Coast
PSM1 - Raised Sea Wall none
PSM2 - Rock Revetment
RamseyHarbourOpen coast
RH1 - Raised Harbour Walls ROC1 - Set Back Wall
RH2 - Set Back Walls ROC2 - Rock Revetment

Appendix E - Design Hazard Inventory

CastletownHarbourOpen Coast
CH1 - Designers hazard inventory COC1- Designers hazard inventory
CH2 - Designers hazard inventory COC2- Designers hazard inventory
COC3- Designers hazard inventory
DouglasHarbourOpen Coast
DH1 - Designers hazard inventory DOCA1- Designers hazard inventory
DH2 - Designers hazard inventory DOCA2- Designers hazard inventory
DOCA3- Designers hazard inventory
DOCB1- Designers hazard inventory
DOCB2- Designers hazard inventory
GanseyHarbourOpen Coast
none GOC1- Designers hazard inventory
GOC2- Designers hazard inventory
GOC3- Designers hazard inventory
LaxeyHarbourOpen Coast
LH1 - Designers hazard inventor LOC1- Designers hazard inventory
LOC2- Designers hazard inventory
LOC3- Designers hazard inventory
PeelHarbourOpen coast
PH1 - Designers hazard inventory POC1- Designers hazard inventory
PH2 - Designers hazard inventory POC2- Designers hazard inventory
Port St
Mary
HarbourOpen Coast
PSM1- Designers hazard inventory none
PSM2- Designers hazard inventory
RamseyHarbourOpen Coast
RH1 - Designers hazard inventory ROC1- Designers hazard inventory
RH2 - Designers hazard inventory ROC2- Designers hazard inventory

Appendix F - Environmental Review

Appendix G - Construction Costs

CastletownHarbourOpen Coast
CH1 - Raised Harbour wall COC1 - Raised Sea Wall
CH2 - Set Back Harbour wall COC2 - Set Back Wall
CH3- Tidal Gate COC3 - Rock Revetment
DouglasHarbourOpen Coast
DH1 - Raised Harbour wall DOCA1 - Set Back Wall
DH2 - Set Back wall DOCA2 - Raised Sea Wall
DH3 - Tidal Gate DOCA3 - Beach Recharge
DOCB1 - Rock Revetment
DOCB2 - XBloc Revetment
GanseyHarbourOpen Coast
none GOC1 - Rock Revetment
GOC2 - XBloc Revetment
GOC3 - Raised Sea Wall
LaxeyHarbourOpen Coast
LH1 - Raised Harbour wall (Wall type 1) LOC1 - Set Back Harbour wall
LH1 - Raised Sea Wall (Wall type 2) LOC2 - Raised Sea Wall
LOC3 - Rock Revetment
PeelHarbourOpen Coast
PH1 - Raised Harbour wall POC1 - Rock Revetment
PH2 - Set Back Harbour wall POC2 - Set Back Wall
Port St
Mary
HarbourOpen Coast
PSM1 - Raised Harbour wall none
PSM2 - Rock Revetment
RamseyHarbourOpen Coast
RH1 - Raised Harbour wall ROC1 - Set Back Wall
RH2 - Set Back Harbour wall ROC2 - Rock Revetment (raised cap)
RH3 - Tidal Gate ROC2 - Rock Revetment
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