IDB Parameters & Statistics

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DISCLAIMER: Data provided in the database is collected from a wide range of sources from multiple US Government authorities and scientific studies over a significant temporal coverage. The sources used were found to be most compatible with quality of product through appropriate scientific methods, some data are the only account of the information available at a particular location. Use of this product may require additional research to original sources for verfication and notice of any updated information.




The database contains entries varying greatly in size of inlet, wave exposure, tidal prism, and number of jetties. For example, the tidal prisms of inlets within the database range from 2.41x106 m3 for Venice Inlet in Florida to 1.44x109 m3 for the San Francisco Bay entrance in California. Inlets with no jetties, one jetty, and two jetties are represented. Table 1 is a listing of the hydraulic, geometric, and tidal parameters included within the Federal Inlets Database.

Mean significant wave height and the associated mean peak wave period were obtained for the inlets from 20-year hindcast statistics available from the U.S. Army Corps of Engineers Wave Information Study (http://www.frf.usace.army.mil/cgi-bin/wis/atl/atl_main.html). Although wave hindcasts have limitations, this procedure is expected to provide uniformity for the needed wave information around the coast of the United States. Tide range was obtained from the closest NOS sea tide gauge (http://tidesonline.nos.noaa.gov/). Tidal prism was compiled from Jarrett (1976), inlet management plans, and other sources. The sources of the information contained within the database are included in Table 1.


Table 1. Parameters Contained within the Federal Inlets

Inlet Name CIRP listing of Federal Inlets (Was this from Mark Byrnes)
State CIRP listing of Federal Inlets
District CIRP listing of Federal Inlets
Federal Channel (Y/N) CIRP listing of Federal Inlets
Federal Inlet (Y/N) CIRP listing of Federal Inlets
Latitude CIRP listing of Federal Inlets
Longitude CIRP listing of Federal Inlets
Number of Jetties (0,1,2) Jarrett (1976) and recent aerial photographs
Weir Industry reports and personal communication
Location of Weir (N,S,E,W) Industry reports and personal communication
No. of Breakwaters Industry reports and personal communication
Tidal Prism, m3 Jarrett (1976) and other industry reports
NOS Station Number http://tidesonline.nos.noaa.gov/
Mean Tidal Range, m http://tidesonline.nos.noaa.gov/
Spring Tidal Range, m
Min. Width, m Aerial photographs and nautical charts
WIS Station Number http://www.frf.usace.army.mil/cgi-bin/wis/atl/atl_main.html
WIS Station Number Lat http://www.frf.usace.army.mil/cgi-bin/wis/atl/atl_main.html
WIS Station Number Long http://www.frf.usace.army.mil/cgi-bin/wis/atl/atl_main.html
WIS Station Depth, m http://www.frf.usace.army.mil/cgi-bin/wis/atl/atl_main.html
Mean Wave Height Hmo, m http://www.frf.usace.army.mil/cgi-bin/wis/atl/atl_main.html
Mean Peak Period Tp, sec http://www.frf.usace.army.mil/cgi-bin/wis/atl/atl_main.html
Rep. Avg Qnet, m3/yr Industry reports and personal communication
Direction of Qnet (degrees) Industry reports and personal communication
Direction of Qnet (N,S,E,W) Industry reports and personal communication
Spring Discharge,m3/s Industry reports and personal communication
River Avg. Discharge m3/s Industry reports and personal communication
River Maximum Discharge m3/s Industry reports and personal communication
Median Grain Size d50,mm Industry reports
Recent Min. Channel Cross Sectional Area Below msl, m2 Industry reports and personal communication
Rep. Avg Annual Entrance Dredging, m3/yr District webpages
Rep. Min Annual Entrance Dredging, m3/yr District webpages
Rep. Max Annual Entrance Dredging, m3/yr District webpages
Maintained Channel Depth Over Bar mllw, m District webpages
Maintained Channel Width Over Bar mllw, m District webpages
Advance Dredging Depth Over Bar, m District webpages
Maintained Entrance Channel Depth mllw, m District webpages
Maintained Entrance Channel Width mllw, m District webpages
Advance Entrance Dredging Depth, m District webpages
Orthogonal of Shoreline (N,S,E,W,NA) Aerial photographs
Comments Miscellaneous sources
Jetty Offset Aerial photographs
Min. Width (reported), m Industry reports
Distance Offshore, km
Distance to Downdrift Attachment minus Wc/2, km Aerial photographs and nautical charts
Distance to Updrift Attachment minus Wc/2, km Aerial photographs and nautical charts