Randall Surveys has a number of small vessels equipped to carry out in-shore hydrographic surveys of canals, lakes, reservoirs, rivers and estuaries. Surveys are primarily undertaken with an array of echo-sounders and survey-grade GPS position fixing equipment. In addition to this Sub-Bottom Profiling, Sector Scanning and SideScan sonar techniques can be employed to provide a fuller picture of the bed surface and sub-surface. Continuously logging tide gauges provide tidal corrections and current meters record direction and strength of flow.

Our hydrographic survey staff are all fully trained in boat handling and safety techniques and our boats are all trailer-launchable. Using the latest processing and communication equipment the data gathered on site is processed by on-board computer and a real-time display of the survey data obtained. The processed data can then be transmitted back to the office for checking and plot production. Final results can be presented as coloured contour plots, sections, or full three-dimensional models for manipulation. Volumes can be calculated against previous surveys, design surfaces or dredging profiles.

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