Inundation Analysis Tool


8443725 Chelsea, MA

Please see the data inventory to find a period with hourly or six-minute data available.
Data Inventory

Note that this is a historical station and data may be available between 2002-06-11 00:00:00 and 2002-10-19 23:59:00


Select a reference elevation and specify a date range for analysis.

You may select from an accepted tidal datum or specify a different elevation.
Most elevations on land are given relative to a geodetic datum such as NAVD88

All analysis results are presently provided in meters relative to the requested threshold.

Meters relative to MHHWFeet relative to MHHWDatum
MHHW 0.0 0.0 Mean Higher-High Water
MHW -0.136 -0.45 Mean High Water
DTL -1.578 -5.18 Mean Diurnal Tide Level
MTL -1.593 -5.23 Mean Tide Level
MSL -1.557 -5.11 Mean Sea Level
MLW -3.051 -10.01 Mean Low Water
MLLW -3.155 -10.35 Mean Lower-Low Water
User Specified Elevation         in       relative to   


Note: Data query is limited to a 10 year maximum and 1 month minimum date range when requesting an analysis of 6-minute data


6-minute Height and High Water Analysis
Hourly Height and High Water Analysis
Hourly Height Analysis