Question

A landfill 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

Answer 1

Answer:

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.