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Comprehensive Evaluation of Projects with Respect to Sea-Level Change


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Sea-Level Change Curve Calculator (2014.88)

The superseded calculator is available here...

EC 1165-2-212 (pdf, 845 KB) and its successor 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.

EC 1165-2-212 (pdf, 845 KB) and its successor 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. A link to an Excel version of the calculator is below the table. The Excel version has a drop-down menu to select tide gauges. Below that is a direct link to the NOAA Tides and Currents web site for the selected tide gauge. ETL 1100-2-1 (pdf, 9.87 MB) , Procedures to Evaluate Sea Level Change: Impacts, Responses, and Adaptation.

EC 1165-2-212, Equation 2: E(t) = 0.0017t + bt2

This on-line Sea Level Change Calculator has several added features which are detailed in the User's Manual. The superseded calculator is available here... You can plot both the USACE and NOAA curves in feet or meters relative to either NAVD88 or LMSL. The West Coast NRC2013 projections are available when a west coast gauge is selected. The NPCC2013 projections for New York City are also available when the NOAA gauge, "The Battery" is selected. This calculator also develops the SLC curves between the user entered dates using equation #3 in ER 1100-2-8162.

USACE Sea Level Change Curve Calculator (2014.88)

Item Display
SLC Curve Chart
SLC Curve Table
Gauge Datum Chart
Gauge Datum Table
SLC Curves
SLC Table
NOAA EWL Chart
Gauge Map
Project Name:
Select NOAA Gauge:
FEMA BFE
(ft)
: ? Information
(NAVD88)
Search for BFE here
Project Start Year:
Interval Year:
Project End Year:
Output Units: Feet Meters
Output Datum: LMSL NAVD88
Output Agency: USACE NOAA Both
SLC Rate: Published Regionally Corrected or User Entered:
(ft/yr)
EWL Type: Highs Lows
EWL Source:
NOAA (GEV) USACE (Percentile)
Chart Size: Height: Width:
Plot EWL/BFE/Tides:
Select Curve:
Critical Elevation #1
(ft)
:
NAVD88
- Description:
Critical Elevation #2
(ft)
:
NAVD88
- Description:
User's Index
(ft)
: ?
Description:
Datum Shift to MSL: 0(ft)
Click on project area. The nearest NOAA gauge will be used to develop RSLC curves based on ER 1100-2-8162, Incorporating Sea Level Change in Civil Works Programs, 31 Dec 2013 and NOAA Technical Report OAR CPO-1, Global Sea Level Rise Scenarios for the United States National Climate Assessment, Dec 2012
*** note - there may be factors other than proximity to consider when selecting a gauge ***
Compliant
Inactive
< 40yrs

back to Comprehensive Evaluation of Projects with Respect to Sea-Level Change page

Revised 19 November 2014

 

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