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Hydrographic Survey

Hydrographic surveys support the planning, engineering design, construction, operation, maintenance, and regulation of navigation, flood control, river engineering, charting, and coastal engineering projects. Our Hydrographic Survey Unit has the capability to perform sidescan, multibeam, and single beam surveys using vessels from our Floating Plant Unit. Its main duties include:
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Click here to expand contentClick here to collapse content  Coastal engineering surveys
These are performed for a variety of purposes. In coastal areas, these surveys determine the condition of beach renourishment or support coastal engineering research studies. Surveys are also performed to study the effects of offshore protection structures (jetties, breakwaters, groins), harbor entrances, estuaries, and coastlines in areas of suspected accretion, erosion, or other material movement or transport. Surveys are also performed to develop, evaluate, and calibrate physical and numerical models used for planning and design of projects.
Click here to expand contentClick here to collapse content  Dredging measurement and payment surveys 

These are associated with contracted construction to measure the amount of excavated, deposited, and/or placed material in subsurface areas. These surveys also include investigative studies used for preparing contract bid documents and for directly monitoring and measuring subsequent contract performance, payment, and acceptance.

Click here to expand contentClick here to collapse content  Project Condition Surveys

These determine the present condition of coastal and inland navigation channels, navigation locks, underwater features, river or flood control structures, or beach/bank erosion protection structures. These surveys are used to determine if project conditions have changed enough to warrant future construction or maintenance activities, if additional condition surveys are required at more frequent intervals, or if a greater survey coverage density is necessary.

Click here to expand contentClick here to collapse content  Reservoir sedimentation surveys

These assess sedimentation and update area-capacity curves.

Click here to expand contentClick here to collapse content  Underwater obstruction or condition surveys

These detect the existence and extent of obstructions to the safe use of waterways.

(USACE EM 1110-2-1003, 2002)

Hydrographic Survey Data

Available Seattle District hydrographic survey data is available on the U.S. Army Corps of Engineers Survey & Mapping website.

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