Comment: 20:39 - 21:47 (01:08)
Source: Annenberg/CPB Resources - Earth Revealed - 21. Groundwater
Keywords: "Jim Goodrich", "Orange County", geologist, "coastal basin", ocean, "sea water", "fresh water", salt, pollution, well, "Water Factory 21", groundwater, "injection barrier", "salt water intrusion"
Our transcription: In addition to ensuring adequate supply, protecting the quality of water is also of utmost importance.
Again, Orange County is an excellent example of how geologists go about doing this.
There are two aspects to water quality that we have to be concerned about.
First of all is we're in a coastal basin, we're next to the ocean.
If we draw the basin down, salt water would flow in to take the fresh water's place and thus severely damage the basin.
The other aspect is pollution.
In the case of saltwater intrusion, we have built injection wells along the coast, and we are either putting imported water in them, or we're putting reclaimed wastewater that's produced at our Water Factory 21.
The Orange County injection wells act as a hydraulic barrier along the coast, which keeps the salt water out even if the level of the groundwater in the basin is drastically lowered.
Geology School Keywords