Get out Obj #9 &10 for a stamp

Review for today’s quiz Obj #1-10

Pass back the permission slip!

Where does your water come from?

Houston Water sources:

Lake Livingston (806 MGD)

Lake Conroe (60 MGD)

Lake Houston (150 MGD)

Evangeline aquifer

1. Screening

2. Coagulationalum

3.Sedimentation

4. Filtration

5. disinfection:chlorineUV rays

ozone

Check out the 2012 water report Identify:

Five radioactive particles. One fat soluble herbicide One heavy metal which causes brain damage Three organic chemicals that probably come from

petroleum refineries How many of these contaminants were higher than the

Maximum Containment Level? (MCL)

Cons

eque

nces

of

usin

g ou

r gro

und

wate

r

Overdraft – taking more water OUT of an aquifer than is recharging IN to the

aquifer (What would happen

to your bank account if you did this?)

Wat

er h

as m

ass

in a

n aq

uife

r

Subs

iden

ce –

sinkin

g of

land

due

to a

quife

r ov

erdr

aft

Bayt

own

– Br

ownw

ood

subd

ivisio

n

Brow

nwoo

d 19

53

Brow

nwoo

d 19

78

Bayt

own

Natu

re

Cent

er to

day

Saltwater intrusion

Houston is switching to just surface water to protect the city from further subsidence.

Overdraft leads to subsidence

Chec

k fo

r un

ders

tand

ing

What is the role of alum in

water treatment?What materials is the filtration

system made out of ?Why is chlorine added to our

drinking water?Why is fluoride added to our

drinking water?How are subsidence and overdraft related?

Why does it matter that our

drinking water supplies are

downstream of Dallas?