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| Terms for subject Environment (5171 entries) |
| vanndirektiv | water protection directive | |
| vannerosjon | water erosion (The breakdown of solid rock into smaller particles and its removal by water. As weathering, erosion is a natural geological process, but more rapid soil erosion results from poor land-use practices, leading to the loss of fertile topsoil and to the silting of dams, lakes, rivers and harbours. There are three classes of erosion by water. 1. Splash erosion occurs when raindrops strike bare soil, causing it to splash, as mud, to flow into spaces in the soil and to turn the upper layer of soil into a structureless, compacted mass that dries with a hard, largely impermeable crust. 2. Surface flow occurs when soil is removed with surface run-off during heavy rain. 3. Channelized flow occurs when a flowing mixture of water and soil cuts a channel, which is then deepened by further scouring. A minor erosion channel is called a rill, a larger channel a gully) | |
| vannforbruk | water consumption (The utilization patterns and quantities entailed in a community or human group's use of water for survival, comfort and enjoyment) | |
| vannforskning | water science (The science that treats the occurrence, circulation, distribution, and properties of the waters of the earth, and their reaction with the environment) | |
| vannforsyning | water supply (A source or volume of water available for use; also, the system of reservoirs, wells, conduits, and treatment facilities required to make the water available and usable) | |
| vannforurensende stoff | water pollutant (A chemical or physical agent introduced to any body of water that may detrimentally alter the natural condition of that body of water and other associated bodies of water) | |
| vannforurensning | water pollution (The manmade or man-induced alteration of the chemical, physical, biological and radiological integrity of water) | |
| vannforvaltning | water management (Measures taken to ensure an adequate supply of water and a responsible utilization of water resources) | |
| vannfugl | waterfowl (Aquatic birds which constitute the order Anseriformes, including the swans, ducks, geese, and screamers) | |
| vannhyasint | water hyacinth (Floating aquatic plant, Eichornia crassipes of tropical America, having showy bluish-purple flowers and swollen leafstalks: family Pontederiaceae. It forms dense masses in rivers, ponds, etc., and is a serious pest in the southern U.S., Java, Australia, New Zealand, and parts of Africa) | |
| vanninfiltrasjon i jorden | water infiltration into the ground (The movement of surface water into soil or rock through cracks and pores) | |
| vanning | irrigation (1. To supply land with water so that crops and plants will grow or grow stronger) | |
| vanningsjordbruk | irrigation farming (Farming based on the artificial distribution and application of water to arable land to initiate and maintain plant growth) | |
| vanningskanal | irrigation canal (A permanent irrigation conduit constructed to convey water from the source of supply to one or more farms) | |
| vanningssystem | irrigation system (A system of man-made channels for supplying water to land to allow plants to grow) | |
| vannkantsendring | waterside development (Any physical extension of, or changes to, the uses of land in waterfront areas) | |
| vannkostnad | water cost (The value or the amount of money exchanged for the production and sustained supply of water) | |
| vannkraft | hydroelectric energy (The free renewable source of energy provided by falling water that drives the turbines. Hydropower is the most important of the regenerable energy sources because of its highest efficiency at the energy conversion. There are two types of hydroelectric power plants: 1. run-of-river power plants for the use of affluent water; 2. storage power plants (power stations with reservoir) where the influx can be regulated with the help of a reservoir. Mostly greater differences in altitudes are being used, like mountain creeks. Power stations with reservoirs are generally marked by barrages with earth fill dam or concrete dams. Though hydropower generally can be called environmentally acceptable, there exist also some problems: 1. change of groundwater level and fill up of the river bed with rubble. 2. Risk of dam breaks. 3. Great demand for land space for the reservoir. 4. Diminution, but partly also increase of value of recreation areas. As the hydropowers of the world are limited,the world energy demand however is rising, finally the share of hydropower will decrease) | |
| vannkraft | water power (Energy obtained from natural or artificial waterfalls, either directly by turning a water wheel or turbine, or indirectly by generating electricity in a dynamo driven by a turbine) | |
| vannkraftverk | hydroelectric power plant (Power station which operates with the free renewable source of energy provided by falling water) |