Locks: Flood Adaptation Measure


Launch exiting tidal lock, Cullen Bay Marina, Darwin, Northern Territory, Australia
©David Wall/Alamy Stock Photo



PHYSICAL INFRASTRUCTURE
SHORELINE LOCATION:
In Water




DESIGN LIFE
ADAPTABILITY
IMPACT ON THE WATERFRONT
CONSTRUCTION COST
50+ Years
Low
Major Intervention
TBD


COASTAL FLOOD HAZARDS MITIGATED:
Sea Level Rise
Storm Surge
Groundwater
Waves
Erosion


MEASURES COMPATABILITY
ECOSYSTEM SERVICES: Measure may affect these shoreline values
Flood
Seismic
Floodwalls, Revetment, Ecological Shorelines
All
Aquatic Habitat
Terrestrial Habitat
Water Quality
Carbon Storage


DESCRIPTION:
Locks are essentially a combination of gates, barriers and pumps which allow for vessels to navigate from high-to-low or low-to-high water levels. This solution is an extreme example of previously presented gates & barriers, but intended for use were sea levels to regularly exceed the vulnerable upland elevation.


CONSIDERATIONS:
ADVANTAGES:
DISADVANTAGES:
  • Large construction that is only applicable at creek mouths.
  • Would need to be paired with adjacent shoreline protection to prevent outflanking.
  • Maintains navigation during high water events.
  • High capital and operational cost.
  • High environmental impact.
  • Potential upland stormwater discharge impacts.
  • Operational impact to navigation by increasing transit time.


CONSTRUCTION IMPACTS TO THE PUBLIC:
SEA LEVEL RISE ADAPTATION OPPORTUNITIES:
CASE STUDIES:
  • Dependent on location and siting.
  • Impacts could be significant if located near shore, or less if in offshore location.
  • Limited adaptability.
  • Could be paired with deployables and shoreline floodwalls as additional protective elements.
  • None cited


DESIGN OPPORTUNITIES:
Ecological Enhancements
Urban Design
Form
  • N/A
  • N/A
  • N/A


DESIGN CONSIDERATIONS:

  • Requires tie into cut-off wall that will disrupt the water column and allow for full closure in the event of a storm surge or king tide.
  • High seismic region will provide a challenge to maintain operability of the gates in the event of moderate to high seismic event.
  • Need to ensure circulation of natural channels is not lost, which may require supplemental pumping to move water and sediment.
  • Extensive permitting process and high level of environmental study.

SITE-SPECIFIC CONSIDERATIONS:

  • This measure would apply only at the Creeks.

INSTALLATION AND CONSTRUCTABILITY CONSIDERATIONS:

  • Costly installation with long lead time and overall construction duration.

ARCHITECTURAL CONSIDERATIONS:

  • Significant visual impact on current shoreline.
  • Certain types of locks could be made publicly accessible which could provide opportunity for creek crossing.

OPERATION AND MAINTENANCE CONSIDERATIONS:

  • Extensive maintenance and monitoring costs, require active operation to ensure they are utilized when needed to protect infrastructure upland.


Download the Locks Factsheet.

Learn about other types of measures from our Measures Explorer page.


Launch exiting tidal lock, Cullen Bay Marina, Darwin, Northern Territory, Australia
©David Wall/Alamy Stock Photo



PHYSICAL INFRASTRUCTURE
SHORELINE LOCATION:
In Water




DESIGN LIFE
ADAPTABILITY
IMPACT ON THE WATERFRONT
CONSTRUCTION COST
50+ Years
Low
Major Intervention
TBD


COASTAL FLOOD HAZARDS MITIGATED:
Sea Level Rise
Storm Surge
Groundwater
Waves
Erosion


MEASURES COMPATABILITY
ECOSYSTEM SERVICES: Measure may affect these shoreline values
Flood
Seismic
Floodwalls, Revetment, Ecological Shorelines
All
Aquatic Habitat
Terrestrial Habitat
Water Quality
Carbon Storage


DESCRIPTION:
Locks are essentially a combination of gates, barriers and pumps which allow for vessels to navigate from high-to-low or low-to-high water levels. This solution is an extreme example of previously presented gates & barriers, but intended for use were sea levels to regularly exceed the vulnerable upland elevation.


CONSIDERATIONS:
ADVANTAGES:
DISADVANTAGES:
  • Large construction that is only applicable at creek mouths.
  • Would need to be paired with adjacent shoreline protection to prevent outflanking.
  • Maintains navigation during high water events.
  • High capital and operational cost.
  • High environmental impact.
  • Potential upland stormwater discharge impacts.
  • Operational impact to navigation by increasing transit time.


CONSTRUCTION IMPACTS TO THE PUBLIC:
SEA LEVEL RISE ADAPTATION OPPORTUNITIES:
CASE STUDIES:
  • Dependent on location and siting.
  • Impacts could be significant if located near shore, or less if in offshore location.
  • Limited adaptability.
  • Could be paired with deployables and shoreline floodwalls as additional protective elements.
  • None cited


DESIGN OPPORTUNITIES:
Ecological Enhancements
Urban Design
Form
  • N/A
  • N/A
  • N/A


DESIGN CONSIDERATIONS:

  • Requires tie into cut-off wall that will disrupt the water column and allow for full closure in the event of a storm surge or king tide.
  • High seismic region will provide a challenge to maintain operability of the gates in the event of moderate to high seismic event.
  • Need to ensure circulation of natural channels is not lost, which may require supplemental pumping to move water and sediment.
  • Extensive permitting process and high level of environmental study.

SITE-SPECIFIC CONSIDERATIONS:

  • This measure would apply only at the Creeks.

INSTALLATION AND CONSTRUCTABILITY CONSIDERATIONS:

  • Costly installation with long lead time and overall construction duration.

ARCHITECTURAL CONSIDERATIONS:

  • Significant visual impact on current shoreline.
  • Certain types of locks could be made publicly accessible which could provide opportunity for creek crossing.

OPERATION AND MAINTENANCE CONSIDERATIONS:

  • Extensive maintenance and monitoring costs, require active operation to ensure they are utilized when needed to protect infrastructure upland.


Download the Locks Factsheet.

Learn about other types of measures from our Measures Explorer page.