I need a matlab code for this

4. Biological Oxygen Demand (BOD) is a measure of the relative oxygen depletion effect of a waste contaminant and is widely used assess the amount of pollution in a water source. The BOD in the i mglL)of a rockfiter without recireulation is given by- Lo 1 2.5D3 VR Where Lo is influent BOD (mg/L), D is the depth of the filter (m), and Q is the hydraulic flow rate (L/(day). a) Assuming Q = 300(m2.day) plot the effluent BOD as a function of the depth of the filter ( 100 D 2000m) for Lo-5, 10, 20 mg/L. b) Make the three plots in one figure, label the axes and display a legend. c) Estimate the depth of the filter required for each of these cases to obtain drinkable water