| A | B |
|---|
| aquifer | a permeable layer of rock and sediments that contains ground water |
| unconfined aquifer | an aquifer made of porous rock covered by soil which water can easily flow into and out of |
| confined aquifer | an aquifer surrounded by a layer of impermeable rock or clay that impedes water flow |
| water table | the uppermost level at which the water in a given area saturates the rock or soil |
| ground water recharge | the input process when water from precipitation percolates through soil and works into the aquifer |
| artesian wells | a well created by drilling a whole into a confined aquifer |
| cone of depression | An area where there is no longer any ground water |
| salt water intrusion | N infiltration of saltwater in an area where groundwater pressure has been reduced from extensive drilling of wells |
| floodplain | The excess of water spreads onto the land anjacent to the river |
| oligotrophic lakes | A lake witha low level of productivity as a result of low amounts of nutrients in the water |
| mesotrophic lakes | a lake with moderate levels of productivity |
| eutrophic lakes | A lake wth high levels of productivity |
| impermeable surfaces | Pavement or buildings that do not allow water penetration |
| levee | A large bank built up on each side of a rivver to prevent fooding |
| dikes | a structure built to prevent ocean water from flooding adjacent lands |
| dam | A barrier that runs across a river to control the flow of water |
| reservoir | A body of water created by blocking the natural flow of water |
| fish ladders | A stair like structure for fish to migrate around a dam |
| aqueducts | A canal or ditch used to carry water fromn on eplace to another |
| desalination | the process of removing salt from saltwater |
| hydroponic agriculture | The cultivation of plants in green house conditions by immersing roots in a nutrient rich solution |
| springs | water that percolates up naturally from an aquifer to the ground |
