Please explain step by step of the next problem:

Problem $3$

An aquifer, covering an area of $3k{m}^2,$ serves as the primary drinking water source for a small village

with a population of $1,500.$ Water consumption is estimated at $50$ liters per capita per day $($LCD$).$

Groundwater inflows contribute a total of $135\frac{m^3}{d}$ to the aquifer, while some groundwater is lost due

to evapotranspiration at a rate of $15m\frac{m}{?}$ year. Assuming negligible impact from other inflows or

outflows, what volume of treated wastewater is required to be injected to maintain the aquifer's water

storage?