Accessibility options


water table

Water Table  
Part of the National cirriculum

spring - Click to enlarge
Click image to enlarge

Upper level of groundwater (water collected underground in porous rocks). Water that is above the water table will drain downwards; a spring forms where the water table meets the surface of the ground. The water table rises and falls in response to rainfall and the rate at which water is extracted, for example for irrigation and industry.

In many irrigated areas the water table is falling due to the extraction of water. Below northern China, for example, the water table is sinking at a rate of 1 m/3 ft a year. Regions with a high water table and dense industrialization have problems with pollution of the water table. In the USA, New Jersey, Florida, and Louisiana have water tables that are contaminated by both industrial wastes and saline seepage from the ocean.

© RM 2009. Helicon Publishing is division of RM.


 
 

Encyclopaedia Search

Click a letter for the index
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Or search the encyclopaedia:
 
 
All results tagged with the symbol denotes content that is relevant to the national curriculum

Advertisement starts



Advertisement ends


Advertisement starts



Advertisement ends

Country Search

 
 

Dictionary search

 
 

Antigua and Barbuda Flag

Antigua and Barbuda Flag
Black reflects the African origins of the islanders. Red stands for the vigour of the people. White represents hope. Effective date: 27 February 1967.

Health Search

 
 
Search all Diseases Medicines

Advertisement starts



Advertisement ends

Skip to page content | Text onlyGraphical version of this page

Tiscali Quicklinks. Please visit our Accessibility Page for a list of the Access Keys you can use to find your way around the site, skip directly to the main navigation, to the page content, or to more links within reference.

web |  shopping |  this site |  video |  local services

Page Footer


Access keys


You will need to use different key combinations in order to use access keys depending on your internet browser, find out which on our accessibility page.
  • (0) Navigate to Accessibility page.
  • (1) Navigate to Home page.
  • (2) Navigate to My email.
  • (3) Navigate to My Account.
  • (4) Navigate to Site Map page.
  • (5) Navigate to Contact us page.
  • (6) Navigate to Members channel.
  • (7) Navigate to Services channel.
  • (8) Navigate to News & Info channel.
  • (9) Navigate to Entertainment channel.
  • ([) Skip down to the Primary navigation block.
  • (]) Skip down to the more links within this section block.
  • (=) Bypass all navigation and jump to the content.
  • (x) Text only version of this page.
Background images used:
furniture images used in the site icons used in the site images used in the header