Alandfill in minnesota receives an average of 50 cm of rainfall per year. sixty percent of the water runs off the landfill. the landfill has a surface area of 5000 m2. the leachate from the landfill is treated for cadmium and other toxic metals. the present leachate collection system is 80% efficient.
what is the volume (in m3) of leachate that is treated per year?
a. 1600
b. 1000
c. 960
d. 800
e. 200

option D.

Explanation:

given,                                                                          

Average rainfall in Minnesota = 50 cm/ year

area of the landfill = 5000 m²            

60% of the water runs off the landfill.

efficiency of leachate collection = 80%

volume of leachate treated per year = ?

volume of rainfall in a year                  

        = 0.5 x 5000                  

        = 2500 m³                    

Volume of  water infiltrated    

     = 40 % of volume of rainfall

     = 0.4 x  2500                  

    = 1000 m³                    

Volume of leachate per year

    = 80 % of 1000              

    = 0.8 x 1000                  

    = 800 m³                  

The correct answer is option D.