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US Army Corps of Engineers
Sea-Level Change Curve Calculator
BUILDING STRONG®

The Sea Level Change Curve Calculator has been integrated into the Sea Level Analysis Tool (SLAT) (accessible here: https://climate.sec.usace.army.mil/slat/). We recommend that all United States Army Corps of Engineers (USACE) personnel use SLAT for their analysis going forward to promote consistency across projects. The Calculator will be deprecated at the end of the 2023 calendar year.

Sea-Level Change Curve Calculator (Version ())

This version employs the same computations as previous versions, yielding the same projections along with some additional functionality, the 2014 NOAA rates, and several additional gauges.

ER 1100-2-8162 (pdf, 317 KB) were developed with the assistance of coastal scientists from the NOAA National Ocean Service and the US Geological Survey. Their participation on the USACE team allows rapid infusion of science into engineering guidance. ETL 1100-2-1 (pdf, 9.87 MB) , Procedures to Evaluate Sea Level Change: Impacts, Responses, and Adaptation.

ER 1100-2-8162 (pdf, 317 KB) use the historic rate of sea-level change as the rate for the "USACE Low Curve". ETL 1100-2-1 (pdf, 9.87 MB) , Procedures to Evaluate Sea Level Change: Impacts, Responses, and Adaptation.

The rate for the "USACE Intermediate Curve" is computed from the modified NRC Curve I considering both the most recent IPCC projections and modified NRC projections with the local rate of vertical land movement added.

The rate for the "USACE High Curve" is computed from the modified NRC Curve III considering both the most recent IPCC projections and modified NRC projections with the local rate of vertical land movement added.

The three scenarios proposed by the NRC result in global eustatic sea-level rise values, by the year 2100, of 0.5 meters, 1.0 meters, and 1.5 meters. Adjusting the equation to include the historic GMSL change rate of 1.7 mm/year and the start date of 1992 (which corresponds to the midpoint of the current National Tidal Datum Epoch of 1983-2001), instead of 1986 (the start date used by the NRC), results in updated values for the coefficients (b) being equal to 2.71E-5 for modified NRC Curve I, 7.00E-5 for modified NRC Curve II, and 1.13E-4 for modified NRC Curve III.

The three local relative sea level change scenarios updated from EC 1165-2-212 (pdf, 845 KB) (and and its successor ER 1100-2-8162), Equation 2 are depicted in the Figure to the right of the table. ETL 1100-2-1 (pdf, 9.87 MB) , Procedures to Evaluate Sea Level Change: Impacts, Responses, and Adaptation.

ER 1100-2-8162, Equation 2: E(t) = 0.0017t + bt2

This on-line Sea Level Change Curve Calculator has several added features which are detailed in the User's Manual. You can plot both the USACE and NOAA curves in feet or meters relative to either NAVD88 or LMSL.

Alternate Projections:

This calculator also develops the SLC curves between the user entered dates using equation #3 in ER 1100-2-8162.

See also the USACE Sea Level Tracker to:

  1. show actual sea level changes vs. the projected sea level change curves
  2. answer the question, "What rate of sea level change is currently being observed at the selected gauge?"



USACE Sea Level Change Curve Calculator ()

Project Name:
Select Gauge:
Scenarios Source:
Output Units: Feet Meters
Output Datum: LMSL
NAVD88

Critical Elevation #1
(ft)
:
NAVD88
- Description:
Critical Elevation #2
(ft)
:
NAVD88
- Description:
SLC Rate:? or enter rate
(ft/yr)
FEMA BFE
(ft)
: ? Information
(NAVD88)
Search for BFE here
Project Start Year:
Interval Year:
Project End Year:
User's Index
(ft)
: ?
Description:
Datum Shift to MSL: 0(ft)
EWL Type: Highs Lows
EWL Source:
NOAA (GEV) USACE (Percentile)
Plot EWL/BFE/Tides:
Select Curve:
Click on project area. The nearest gauge/grid point will be used to develop RSLC curves based on the selected Scenario Source

*** note - there may be factors other than proximity to consider when selecting a gauge ***

Compliant -
Non-Compliant -
Inactive -





Revised

 

About the Program

Climate change has the potential to affect all of the missions of the U.S. Army Corps of Engineers. The Climate Preparedness and Resilience Community of Practice develops and implements practical, nationally consistent, and cost-effective approaches and policies to reduce potential vulnerabilities to water infrastructure resulting from climate change and variability. We work in partnership on this effort with other Federal science and water management agencies, academic experts, the private sector, and other stakeholders.

Planning for Changing Sea Levels

Engineering Technical Letters

SLC User Manual

 

 

Civil Works Business Intelligence (CWBI)