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)

Conse

quence

s of

usi

ng o

ur

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?)

Wate

r has

mass

in

an a

quifer

Subsi

dence

– s

inki

ng

of

land d

ue t

o a

quifer

ove

rdra

ft

Bayt

ow

n –

B

row

nw

ood

subdiv

isio

n

Bro

wnw

ood 1

953

Bro

wnw

ood 1

978

Bayt

ow

n N

atu

re

Cente

r to

day

Saltwater intrusion

Houston is switching

to just surface water

to protect the city from further subsidence.

Overdraft leads to subsidence

Check

for

unders

tandin

g

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?