Tailwater
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Tailwater refers to a type of trout fishery. Tailwater fisheries are created at the outflow from large dams, where the size of the reservoir creates a steep temperature gradient, with colder water stored at the bottom of the reservoir near the outlet. The constant cold-water flow provided by the reservoir's outflow, coupled with the generally silt-free nature of the outflow, creates ideal water conditions for trout in environments that ordinarily might not support a robust trout population. An example of this phenomenon is the fishery at Lee's Ferry on the Colorado River in Arizona.
- Tailwater also refers to surface runoff resulting from crop irrigation. Irrigation practices such as flood irrigation and sprinkler irrigation can result in applied water in excess of the infiltration rate of the soil. Sloped fields can allow for the excess water to run off the field, and discharge to a drainage channel or natural water body. Tailwater can carry pollutants such as silt, nutrients (from fertilizers), and pesticides.
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