Services survey

Hydrographic Surveying

DLZ performs hydrographic surveying of lakes, rivers, slips, lagoons, and other water bodies for dredging, beach nourishment and protection, navigation, operations and maintenance, and flood control projects. Utilizing echosounder technology, in conjunction with RTK and DGPS survey equipment, we can collect underwater topographic information of the water body and accurately position the data to depict the planimetric features. This data can be integrated with shoreline topographic survey or 3-D laser scan data and surrounding land surveys to create overbank surveys. Our services include:

  • Digital terrain models
  • Determination of minimum water depth requirements
  • Industrial slip surveys
  • Overbank surveys
  • Payment quantity surveys
  • Pre- and post-dredging surveys
  • Project condition surveys
  • Revetment, dike, and levee surveys
  • River and canal cross-sections
  • Sediment monitoring
  • Site control and calibration for high accuracy dredgepack set-up
  • Sub-bottom profiling
  • Underwater obstruction surveys
  • Volume calculations

DLZ can utilize single or multibeam echosounders, magnetometers sub-bottom profiles, underwater scanners, and RTK GPS in conjunction with HYPACK data acquisition software to produce an array of deliverables depending on our clients’ needs. Our professional, licensed, and certified staff specialize in accurate and precise data gathering and quick turnaround. DLZ also is a corporate member of The Hydrographic Society of America (THSOA).