The NOAA Tides and Currents site provides access to historic and real-time water level data. RAMADDA provides 4 entry types for accessing this data-
Each of these entry types takes a Station ID (e.g., 8575512). Upon entry creation RAMADDA will fetch the metadata for the site from NOAA and populate the entry with the station name, latitude/longitude, flood stages and sea level datums. The Station IDs per state can be viewed at the NOAA site.

You can specify a single Station ID or you can upload a file that contains any number of Station IDS through the Bulk Upload form entry. As a convenience the list of sites per state are available on Github. The NOAA Tides - Water Level entry type can read one of 3 products - 6 Minutes, Hourly Height, High/Low. e.g., see the example site @NOAA. You can also specify the datum for the water levels.

Each of these products can have a maximum number of days. If the number of days < 0 then RAMADDA uses the maximum number of days offset from the current time: One can also specify a number of days offset from either the current time: Or specify a number of days offset from the end date of the entry Or specify an absolute date range with the start and end dates of the entry: You can also download one of the files from the NOAA site (or from the RAMADDA entry) and upload the file to the Water Level entry: The default display of the Water Level entry includes a display of the minor/moderate/major flood levels. Note: the flood levels are based on the Station Datum water level height. The Monthly Mean entry type operates similarly to the Water Level for specifying a date range. However, this data can span decades. The default is to read 40 years of data. The NOAA site provides long term sea level trend data, e.g. https://tidesandcurrents.noaa.gov/sltrends/sltrends_station.shtml?id=8575512 . The Sea Level Trend entry type requires a Station ID. It will download the file and store it in RAMADDA. The NOAA Tides entry type is just generic and takes any of NOAA CSV data files. RAMADDA provides a gettide.sh shell script that will download all of the hourly heights for a given station and process it to give the count of hours above flood stage per year and a listing of flood events. The heights data can be extensive, dating back close to a century for some stations.

The script is available on github @ https://github.com/geodesystems/ramadda/blob/master/src/org/ramadda/geodata/point/bin/gettide.sh . The script requires the RAMADDA SeeSV package to be installed. Consult the documentation in the script.