ETL 1110-2-362
31 Jul 95
(g) Change pool elevations to increase or
(h) Schedule maintenance and inspection shut-
decrease hydraulic retention time to change pool
downs at times of least environmental impact.
sedimentation patterns.
Schedule cool season, high downstream
(h) Increase water storage to increase retention
uncontrolled flow periods to minimize biolog-
time/trap efficiency to allow settling of heavy metal
ical and water quality impacts.
degraded inflows and suspended solids to improve
pool and outflow quality.
Utilize pumping and/or bypass flows to sus-
tain tailwater during shutdowns.
(i) Evacuate/store undesirable strata of water
(i.e., anoxic, nutrient rich, acidity, or metal degraded
Limit duration of shutdowns.
waters).
Perform preshutdown and postshutdown
(j) Use pool fluctuation to control mosquitoes or
compensation flow increases.
other nuisance organisms.
Perform fish salvage and relocation
(k) Manage drought for flow enhancement.
operations.
(l) Use pool drawdown during the summer to
Encourage creative uses of excess flood
promote growth of emergent/terrestrial vegetation to
waters (i.e., selenium flushing in degraded
provide shoreline erosion protection or habitat.
agricultural areas).
(m) Use winter drawdown to desiccate nuisance
Perform emergency operations to either slow
plants.
or flush sewage, chemical, and oil spills from
water intakes or other sensitive areas.
(3) Discharge schedules and flow augmentation
operations.
Induce periodic controlled flooding of flood
plain to maintain wetlands and similar type
(a) Augment downstream flows to dilute,
habitats.
neutralize, cool, aerate, or otherwise improve target
waters.
(4) Chemical treatments.
(b) Moderate rates of change to avoid thermal
(a) Liming.
shocking of fish, fish stranding, scouring, and other
disruptive impacts.
(b) Fertilization.
(c) Establish system operations for both Federal
(c) Algicide/herbicide.
and non-Federal reservoirs to provide water quality/
environmental benefits.
(d) Alum.
(d) Establish in-stream flow needs and appro-
(e) Oxygen.
priate minimum flow values.
(f) Air.
(e) Use real-time operations based on variations
(5) River, stream, and navigation system
in tributary flow and water quality conditions at
operations.
downstream target reaches.
(a) Schedule dredging, bank excavations, and
(f) Prevent fish entrainment, or conversely, use
other activities that generate high turbidity outside of
deliberate fish flushing operations to replenish down-
stream populations where desired and appropriate.
sensitive spawning and recreation seasons.
(g) Promote migration of anadromous fish.
A-6
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