The hydrologist examined the hydrograph to determine when peak discharge would occur.

The researchers compared hydrographs from multiple gauging stations to identify trends in flood frequency.

The hydrographical survey revealed unexpected currents near the estuary.

The hydrographic survey revealed unexpected sandbars near the harbor entrance.

The hydrographer carefully mapped the shifting sandbars to update the nautical charts before the storm.

The hydrographers used the latest sonar technology to map the submerged canyon.

The new channel was hydrographically mapped to update the nautical charts.

The research team compared historical hydrographies to modern surveys to assess coastal change.

The hydrographists spent the week mapping the shifting sandbanks near the harbor.

The old hydrographist meticulously charted the once-uncharted coastline, his notes a bridge between explorers and the coming age of precise maps.