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Coastal Engineering Company of Orleans Cape Cod
Old Mill Boatyard Dredge Sample And Hydro Survey 2

Old Mill Boatyard Dredge Sample and Hydro Survey

Increasing Navigable Depth for Vessels Docked at the Old Mill Boat Yard Facility

The Town of Chatham hired Coastal Engineering to provide hydrographic surveying and engineering services for the dredging of Old Mill Boat Yard. The goal of the project was to increase the navigable depth for vessels docked at the Old Mill Boat Yard facility. Coastal Engineering’s role in the project was to conduct a pre-dredge hydrographic survey of the designated dredge area to determine the cubic yardage of sediment that would be dredged, and to conduct post-dredge surveys to determine if the dredge contractor was able to reach the design depth and calculated the volume that was dredged. Coastal Engineering also prepared pre-dredge and post dredge plans to show the contours before and after dredging was completed. The hydrographic survey was completed using the Coastal Engineering survey vessel equipped with a single beam transducer, digital fathometer, and RTK GPS antenna. Grades underneath the floating dock located in the middle of the dredge area were determined by Coastal Engineering’s divers.


  • Pre-dredge and post-dredge hydrographic survey of the proposed dredge area
  • Preparation of a plan of the surveyed area at one-foot contours
  • Post-dredge volume calculations
  • Dredge material sampling and report