In all cases, monitoring seepage is essential, and in some instances may be the only action
necessary.
Monitoring seepage and seepage control measures can lead to a rational conclusion with a
minimum of expenditure. The most common and easiest monitoring is simply to rely on visual
observations and inspections at various intervals and reservoir elevations. Periodic
photographing and videotaping of potential distressed areas can provide valuable
documentation. If the latter monitoring methods are used, it is vital that the camera always be
in the same position to permit easy interpretation.
If not already accomplished during construction, a common recommendation may be to install
instrumentation such as piezometers, observation wells, and seepage collection systems to
determine more definite patterns of seepage behavior.
Review the data on a regular basis to detect any major seepage changes and long-range
trends. If monitoring indicates that a potentially dangerous seepage problem may exist,
consider permanent structural or regulatory measures (i.e. permanent reservoir level
restriction).
If monitoring is selected as a remedial measure, it may also be desirable to consider automated
instruments with predetermined criteria or values to flag undesirable behavior.