Glossary beginning with I
terms for which definitions are available
- impairment
weakening, damage, or instability, such as the effects caused by pollution
- impervious
incapable of being penetrated, such as a surface that does not absorb water
- infill
development that occurs on smaller parcels that remains undeveloped but is within or in very close proximity to urban or densely developed areas; usually relies on existing infrastructure and does not require an extension of water, sewer, or other public utilities
- infiltration
movement of surface water into the soil, where it is absorbed by plant roots, evaporated into the atmosphere, or percolated downward to recharge groundwater
- infrastructure
the basic system of utilities and services needed to support a society; structures such as culverts, pipes, bridges, dams, and flood control measures can cause instability of streams and affect aquatic habitats
- inlet
the upstream end of any structure through which water may flow
- insoluble
unable to pass into solution
- invertebrates
animals, such as insects and crustaceans, that lack backbones (vertebrae)
- IWMP
Ingetrated Watershed Management Plan