Hydrology EESC BC 3025
HYDROLOGY - Homework # 8 - due 3/29
1.) (12
points) Tucson water issues
Download
the TAMA (Tucson Active Management Area) water use data (TAMA_projections.xls)
and make
(linear?)
projections for population and related water demand for the next
40 years. Play with different scenarios, assuming you (a) do
and (b) do not have access to CAP water.
Note the comments in the spreadsheet for explanation of the
different uses of water.
How can you match supply and
demand? What policy recommendations you would make for this
region? Use a couple of graphs to support your argument.
Print out and attach the spreadsheet you used for your projections.
2) (8 points) Bangladesh
Arsenic issue
(a) Typical sediment in Bangladesh contain about 2mg/kg Arsenic.
Assuming a typical prorosity for sand (25%) determine
what the maximum As concentration in water could be if you dissolve
all this As in the water in one instant. The density of the solid phase is the sediments is of the
order of 2.6 kg/liter.
(b) As discussed in class, As is increasing linearly with the 3H/3He
age.
The
slope of that relationship tells us that As is accumulated in
groundwater at a rate of about 20ugL-1yr-1.
If groundwater would flow through the system at a
constant rate, how long would it take to remove all the Arsenic?
3) (8) CO2
sequestration
The US emission of CO2 from non-stationary sources amounts to 7
Gt/year.
(a) Imagine you were able to collect 50% of this CO2 and compress it
to supercritical conditions (density of CO2 is then 0.47
g/cm3). How large a volume would this take up (in km3)
(b) If you had a formation 100m thick to store the CO2 in
with a porosity of 10%, and you were able to displace all fluids
currently in this formation with the CO2, how large an
area would the CO2 saturated aquifer cover? What fraction
of NY State would this represent?