WATER RESOURCES

6. canals or ditches used to carry water from one location to another.
7. removing the salt from salt water to obtain fresh water.
8. high levels of productivity
11. is a generally flat area of land next to a river or stream.
13. an aquifer that is simply porous rock covered by soil.
14. a barrier that runs across a river or stream to control the flow of water.
15. a moderate level of productivity
17. is any solid surface that will not allow water to penetrate through such as asphalt, concrete, stone, brick, roofing, or extremely compacted ground like a soccer field.
19. the input process of water percolating into an aquifer

1. small spaces found within permeable layers of rock and sediment where water is found.
2. the pumping of fresh water out of a well is faster than the recharge. Near coastal areas this can cause salt water to infiltrate the aquifer.
3. crops grown in fertilized water and no soil.
4. an area where there is no longer any groundwater.
5. well from which water flows under natural pressure without pumping.
9. an aquifer surrounded by a layer of impermeable rock or clay.
10. low amounts of nutrients such as phosphorous and nitrogen.
12. the uppermost level at which the water in an area fully saturates the rock or soil.
16. similar to a levee but built to prevent ocean waters from flooding adjacent land.
18. an enlarged bank built up on each side of the river.