Hydrology

4. Any deliberate disposal at sea of wastes or other matter from vessels, aircraft, platforms or other man-made structures at sea
6. an analytical parameter representing the amount of dissolved oxygen consumed by aerobic bacteria growing on the organic material present in a water sample at a specific temperature over a specific time period.
9. excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.
10. a barrier constructed to hold back water and raise its level, forming a reservoir used to generate electricity or as a water supply.
11. land consisting of marshes or swamps; saturated land
13. eroded material that is being transported by water, settles out of the water column onto the surface, as the water flow slows.
15. an artificial waterway constructed to allow the passage of boats or ships inland or to convey water for irrigation.
16. uses require that water be left in the stream
17. Illnesses caused by microorganisms in untreated or contaminated water.
18. prevention of wasteful use of a resource

1. the modification of a natural river channel
2. form of precipitation that has unusually elevated levels of hydrogen ions
3. a process which removes and eliminates contaminants from wastewater and converts this into an effluent that can be returned to the water cycle.
5. involve withdrawing water, as for municipal and industrial uses
6. the use of either naturally occurring or deliberately introduced microorganisms or other forms of life to consume and break down environmental pollutants, in order to clean up a polluted site
7. occurs when, over a period of years, more water is pumped from a groundwater basin than is replaced from all sources
8. a hydrological tool used to quantify the flow of water in and out of a system.
12. water that exists underground in saturated zones beneath the land surface
14. the process of removing salt from seawater