What is a watershed? - ANSWER - An area of land that drains to a single point
River Basin - ANSWER - An area where water drains to and leads to the ocean
What percent of the earth is covered by water? - ANSWER - 71%
What percent of a human is made up of water? - ANSWER - 65-70%
How many liters of water are needed to maintain bodily functions? - ANSWER - 1-3 liters/day
What is the second most basic human need? - ANSWER - Water
What state drains the most amount of water? - ANSWER - California
Reduction of recharge area - ANSWER - Hard surfaces such as roads, parking lots, rooftops
that do not allow rainfall to infiltrate the soil and recharge groundwater
Salt Water intrusion - ANSWER - Migration of salt water from ocean to pumping wells due to
excessive water level drops in fresh water aquifers
Aquafers - ANSWER - Permeable rock or sediments that transmit water easily
Water Stress - ANSWER - Where the amount of renewable freshwater per person is under
1,700 cubic meters annually; 40% of the world lives in water stressed areas
, Water Scarcity - ANSWER - Per capita water availability is under 1000 cubic meters
Meterological Drought - ANSWER - Based on historical rainfall average
Agricultural Drought - ANSWER - Based on soil moisture
Hydrologic Drought - ANSWER - Based on streamflow or groundwater levels
What percent of all available freshwater is groundwater? - ANSWER - 96%
Why is groundwater preferred over surface water? - ANSWER - Groundwater is typically cleaner
and purer
Groundwater Depletion - ANSWER - Persistent lowering of the water table; more withdraw than
deposit
Ogallala Aquifer in American West - ANSWER - Worlds largest underground water reserve that
runs beneath 8 states; supplies near 33% of all water irrigation
Reasoning for Groundwater Depletion - ANSWER - Excessive pumping; reduction of recharge
area; salt water intrusion
Confining bed - ANSWER - Largely impermeable layers that hinder water's movement
Groundwater Contamination - ANSWER - Degradation of groundwater supplies often occurs
from waste storage, treatment or disposal facilities
The leading contributor to ground water contamination - ANSWER - Poor waste management
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