Glossary U

The Environmental Glossary. Letter U +++ 'Urban Fabric Analysis', 'Utility-interactive', 'Ultraviolet radiation'

U.S.G.S. --->U.S. Geological Survey

German: Ultraviolett
Ultraviolet radiation (UV) is a portion of the electromagnetic spectrum with wavelengths shorter than visible light.

An unconfined aquifer is an Aquifer whose upper water surface (water table) is at atmospheric pressure, and thus is able to
An unimodal response is a response in which a species has a single peak abundance at an optimal value (or range) of an Environmental variable and its abundance
An Unit surcharge is a surcharge imposed for all water use above a threshold level for excess consumption established based on average Per capita or per-household consumption.
- universal transverse Mercatorprojection : An universal transverse Mercator (UTM) projection is the map projection used in many standard map series.
- Upper-bound Lifetime Cancer Risk: : An Upper-bound Lifetime Cancer Risk is a plausible upper limit to the true Probability that an individual will contract cancer over a 70 year lifetime as a result of a given hazard (such as
An Urban and Built-Up Areas is a land use category consisting of residential, industrial, commercial, and institutional land construction sites; public administrative sites; railroad

The Urban Fabric Analysis is a method for determining the proportions of vegetative, roofed, and paved surface Cover relative to the total urban surface in the city. 

- Urban Heat Island Effect: : An Urban Heat Island Effect is a measurable increase in ambient urban air temperatures resulting primarily from the replacement of vegetation with buildings, roads, and other heat-absorbing infrastructure.