groundwater reservoirs
81Cave — For other uses, see Cave (disambiguation). Cavern redirects here. For other uses, see Cavern (disambiguation). Lechuguilla Cave, New Mexico A cave or cavern is a natural underground space large enough for a human to enter. The term applies to… …
82Waste pond — A waste pond or chemical pond is a small impounded water body used for the disposal of water pollutants, and sometimes utilized as a method of recycling or decomposing toxic substances. Such waste ponds may be used for regular disposal of… …
83soil — soil1 soilless, adj. /soyl/, n. 1. the portion of the earth s surface consisting of disintegrated rock and humus. 2. a particular kind of earth: sandy soil. 3. the ground as producing vegetation or as cultivated for its crops: fertile soil. 4. a… …
84Drought Research Initiative — The Drought Research Initiative(DRI) was established to better understand the physical characteristics of and processes influencing Canadian Prairie droughts, and to contribute to their better prediction, through a focus on the recent severe… …
85Water supply in Hong Kong — Providing an adequate water supply for Hong Kong has always been difficult because there are few natural lakes, rivers or substantial groundwater sources and of its high population density. Although the annual rainfall averages 2 214.3… …
86water-supply system — Facilities for the collection, treatment, storage, and distribution of water. Ancient systems included wells, storage reservoirs, canals and aqueducts, and water distribution systems. Highly advanced systems appeared с 2500 BC and reached their… …
87Geotechnical engineering — [ Boston s Big Dig presented geotechnical challenges in an urban environment.] Geotechnical engineering is the branch of civil engineering concerned with the engineering behavior of earth materials. Geotechnical engineering includes investigating …
88Water tower — A water tower, watershed, or elevated water tower is a large elevated water storage container. The term tower speaks to its elevation and is constructed for the purpose of holding a supply of water at a height sufficient to pressurize a water… …
89Sea level — For the sea level change associated with the current episode of global warming, see current sea level rise. For other uses, see Sea level (disambiguation). This marker indicating the sea level is placed on the path from Jerusalem to the Dead Sea …
90Colorado River Aqueduct — Parker Dam on Lake Havasu where Colorado River waters are initially drawn into the system Begins Lake Havasu, San Bernardino County …
