Time$-$Varying Pumping $[5$ points$]$

A pump operates at $4,000f\frac{t^3}{?}$ day in a confined aquifer $(b=100ft)$ with $T=500f\frac{t^2}{?}$ day and $S=0\mathrm{.}0002.$ Drawdown is assessed

at a distance $r=100ft$ from the well. Provide a plot of drawdown vs$.$ time $($up to $30$ days$)$ for the following three scenarios:

a$)$ Pump is shut off at $10$ days.

b$)$ Pump rate decreases to $2,000f\frac{t^3}{?}$ day at $10$ days.

c$)$ Pump rate increases to $6,000f\frac{t^3}{?}$ day at $10$ days.

Estimating Aquifer Properties under Steady Conditions $[5$ points$]$

In the unconfined aquifer shown below, the pumping well is metered. After a long period of pumping, $Q$ has stabilized, and is

measured to be approximately $8,000\frac{m^3}{?}$ day. At this time, groundwater head is measured in two monitoring wells $($the first on

the left side; the second on the right side$)$: at $20m$ from the well, head is measured to be $27\mathrm{.}7m$; at $80m$ from the well, head

is measured to be $32\mathrm{.}4m.$

a$)$ Draw the current system conditions on the diagram below.

b$)$ Estimate the hydraulic conductivity $K$ of the aquifer.

Estimating Aquifer Properties in a Confined Aquifer $[5$ points$]$

For the pumping test data shown on Page $4$ of Lecture $6\mathrm{.}4,$ estimate $T$ and $S$ of the confined aquifer, using:

Spreadsheet approach $($minimize residuals$)$

AQTESOLV. Show a screenshot of results.

Estimating Aquifer Properties in an Unconfined Aquifer $[5$ points$]$

For the Gilcrest pumping test problem shown on Page $6$ of Lecture $6\mathrm{.}4,$ estimate $T$ and $S_y$ of the unconfined aquifer

using the data provided in the spreadsheet Problem $6$ data. You can use either a spreadsheet approach or AQTESOLV.