Remember: all units must be consistent! $($i$.$e$.$ gal$/$min must be converted to $\frac{m^3}{?}$ day, etc...$)$

Dewatering an Excavation Site $[10$ points$]$

It is necessary to lower the groundwater level in an unconfined aquifer in the area of an excavation pit by means of $6$ fully

penetrating wells arranged along the contour of the pit. The initial saturated thickness is $50m,$ the hydraulic conductivity of the

aquifer is $10\frac{m}{?}$ day, and the specific yield is $0\mathrm{.}15.$ To secure the necessary conditions for the excavation pit, the groundwater level at

the center of the pit $($point $M)$ needs to be lowered by $8\mathrm{.}0m$ relative to the present value within $60$ days of pump operation.

a$)$ Assuming that each well operates at the same capacity, what is the minimum required pumping rate day$)$ to achieve

the $8m$ of drawdown within $60$ days?

b$)$ For the pumping rate found in a$),$ provide a time series of drawdown at point $M$ for the first $2$ years of operation.

c$)$ Using the Theis$\_$DrawdownSimulator spreadsheet VBA program, show a map of drawdown at time $=60$ days.