Monitoring the stability and health of dams is essential for preventing catastrophic failures. Earthen dams, primarily constructed from compacted soil, require meticulous monitoring due to their susceptibility to erosion, seepage, and internal movement.

Key parameters monitored in earthen dams include pore water pressure, seepage rates, and movement of the dam body. Instruments like piezometers and extensometers are utilized for these measurements.

Rockfill dams, although sharing similar monitoring principles, present distinct differences. With a composition that includes rocks and gravel alongside compacted earth, pore water pressure within the rockfill is less emphasized. Instead, focus shifts to proper drainage management to mitigate water pressure build-up.

While rockfill dams are generally less prone to movement due to the stability provided by larger rocks, monitoring for excessive movement remains vital.

In conclusion, both earthen and rockfill dam monitoring endeavors aim to ensure stability and prevent potential failures, with specific techniques tailored to each dam's design and materials.