Please solve it as NON-STEADY STATE and show step by step how to sketch!

Waste (BOD) load of Wastewater BOD5=40mg/LQw=1500m3/d Qr=0.5m3/sec BOD5=3mg/L DO =8mg/L k=0.23/d T=20C Velocity of stream =0.2m/s Depth =2.66m Sketch C (BOD5 concentration)\& DO profiles for a 100km reach downstream with t=30 min (could be longer or shorter) using Euler or Runge-Kutta method with advectivedispersive-biodegradation terms, for DO include reaeration. Compare DO for 100km using also the solution and note how different it is from numerical solution: D=krkdkdL0(ekdtekrt)+D0ekrt Kr(20C)=3.9u1/2/H3/2 reaeration constant as a function of stream velocity and depth You can make additional assumptions as required. Waste (BOD) load of Wastewater BOD5=40mg/LQw=1500m3/d Qr=0.5m3/sec BOD5=3mg/L DO =8mg/L k=0.23/d T=20C Velocity of stream =0.2m/s Depth =2.66m Sketch C (BOD5 concentration)\& DO profiles for a 100km reach downstream with t=30 min (could be longer or shorter) using Euler or Runge-Kutta method with advectivedispersive-biodegradation terms, for DO include reaeration. Compare DO for 100km using also the solution and note how different it is from numerical solution: D=krkdkdL0(ekdtekrt)+D0ekrt Kr(20C)=3.9u1/2/H3/2 reaeration constant as a function of stream velocity and depth You can make additional assumptions as required