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Section 11 Glossary of Terms and Acronyms

EAA Storage Reservoirs Revised Draft PIR and EIS February 2006

11-4

Instream flow requirements— Amount of water flowing through a stream course

needed to sustain instream values.

Minimum flow— Lowest flow in a specified period of time.

Peak flow— Maximum instantaneous flow in a specified period of time.

Habitat— Area where a plant or animal lives.

Heterogeneity— Unlike, dissimilar, not uniform

Hydrologic response— An observed decrease or increase of water in a particular

area.

Hydroperiod— For non-tidal wetlands, the average annual duration of flooding

is called the hydroperiod, which is based only on the presence of surface water

and not its depth.

Hydropattern— A less frequently used but nonetheless important term that

refers to depth as well as hydroperiod is hydropattern. Hydropatterns are best

understood by a graphic depiction of water level (above as well as below the

ground) through annual cycles.

Indicator species— Organism, species, or community which indicates presence of

certain environmental conditions.

Irrigation water— Water made available from the project which is used

primarily in the production of agricultural crops or livestock, including domestic

use incidental thereto, and the watering of livestock. Irrigation water also

includes water used for domestic uses such as the watering of landscaping or

pasture for animals (e.g., horses) which are kept for personal enjoyment.

Juvenile— Young fish older than 1 year but not having reached reproductive

age.

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