performance of the technique so that costs may be reduced through optimization of the operation of the
5.1.2 SHORT AND LONG TERM TRENDS
Monitoring at an appropriate level (in both time and space) to identify short term trends (diurnal
impacts, critical periods, operations) and long term trends (seasonal or annual responses, community
structure, trophic status) provides information about the effect of the technique on the ecosystem
(watershed, reservoir, tailwater) and may provide information applicable to other sites.
5.1.3 OPERATION AND MAINTENANCE
Operation and maintenance of the system implemented should be evaluated and tracked to
provide information on performance and costs. Upgrading equipment should be considered as new
technology is developed. Capital expenses may be offset by equipment with a longer life or lower
5.1.4 SYSTEM OPTIMIZATION
Using information from monitoring and records of operation and maintenance, the application of
a technique may be optimized to improve efficiency and reduce cost. Knowledge of temporal and
spatial processes may also result in reduced operation and a decreased operating cost. Using the
system in conjunction with other techniques or at various levels will also decrease costs.
National Research Council (U.S.). 1992. Restoration of Aquatic Ecosystems, Science, Technology,
and Public Policy, Committee on Restoration of Aquatic Ecosystems: Science, Technology, and Public
Policy, Water Science and Technology Board, Commission on Geosciences, Environment, and
Resources, National academy Press, Washington, DC.