6. Applied Geology

Hydrogeology — Quiz

Test your understanding of hydrogeology with 5 practice questions.

Practice Questions

Question 1

Which term defines the upper surface of the saturated zone in an unconfined aquifer?

Question 2

In a homogeneous unconfined aquifer with hydraulic conductivity $K=10\,\mathrm{m/d}$, cross-sectional area $A=100\,\mathrm{m^2}$, and hydraulic gradient $i=0.01$, what is the Darcy discharge $Q$?

Question 3

During a steady‐state pumping test in a confined aquifer, a well is pumped at $Q=1500\,\mathrm{m^3/d}$. Hydraulic head at $r_1=30\,\mathrm{m}$ is $h_1=20\,\mathrm{m}$ and at $r_2=120\,\mathrm{m}$ is $h_2=15\,\mathrm{m}$. Assuming Thiem conditions, what is the transmissivity $T$ (in $\mathrm{m^2/d}$)?

Question 4

If the specific storage of a confined aquifer is $S_s=1.0\times10^{-6}\,\mathrm{m^{-1}}$ and its thickness is $b=15\,\mathrm{m}$, what is the storativity $S$?

Question 5

In contaminant transport, the retardation factor $R$ is given by $R=1+\frac{\rho_bK_d}{n_e}$. For bulk density $\rho_b=1700\,\mathrm{kg/m^3}$, distribution coefficient $K_d=0.002\,\mathrm{m^3/kg}$, and effective porosity $n_e=0.25$, what is $R$?