Unit 8 Global Water ResourcesPresentation Transcript
Unit 8: Global Water
Distribution of Freshwater
Definition of Groundwater Hydrology
The study of the occurrence, circulation,
distribution, and properties of any liquid water
residing beneath the surface of the earth.
● focuses on the distribution and movement of
water beneath the earth's surface.
● is important for use in water supply and
● helps farmers, rural homeowners, industrial
water supply leaders, well drillers and others
learn about the development, occurrence,
and conservation of groundwater.
World Demand for Water
Depletion of Freshwater Resources
Skin and eye infections
Cholera and typhoid
Lead is a material
plumbers use when
The study found that women living in communities in which many
homes had more than 10 micrograms of lead per liter of drinking water
were more likely to have a child with neuraltube defects. Overall, the
risk of such birth defects increased 25% for every 10% increase in lead
Congress enacted the Reduction of Lead in
Drinking Water Act on January 4, 2011
To amend Section 1417 of the Safe Drinking
Water Act (SDWA) regarding the use and
introduction into commerce of lead pipes,
plumbing fittings or fixtures, solder and flux.
The Act established a prospective effective
date of January 4, 2014, which provided a
three year timeframe for affected parties to
transition to the new requirements.
use this site
What is this so-called “Stormwater?”
Definition~ Surface water in abnormal quantity
resulting from heavy falls of rain or snow.
Are they connected to Storm Drains
YES! Storm Drains collect all of the fresh water
No... not always.....
“As the runoff flows over the land or impervious
surfaces (paved streets, parking lots, and
building rooftops), it accumulates debris,
chemicals, sediment or other pollutants that
could adversely affect water quality if the runoff
is discharged untreated”. (U.S.E.P.A, 2012)
How can it become clean?
The National Pollutant Discharge Elimination System (NPDES) Stormwater
Program regulates stormwater discharges from three potential sources:
municipal separate storm sewer systems (MS4s), construction activities,
and industrial activities.
This permitting mechanism is designed to prevent stormwater runoff from
washing harmful pollutants into local surface waters such as streams,
rivers, lakes or coastal waters.