1. Compare values for υl calculated from Eqs XXXXXXXXXX) and XXXXXXXXXX), using D 10 -2 cm 2 /s, uŁ = 3cm/s, H = 2m, and U = 0.7m/s. Use C 1 = 4 and find the value for C 2 so that the two equations...

1. Compare values for υl calculated from Eqs. (12.4.16) and (12.4.18), using D 10^-2cm²/s, uŁ = 3cm/s, H = 2m, and U = 0.7m/s. Use C₁
= 4 and find the value for C₂
so that the two equations give the same result. Does this seem like a reasonable value for C₂?

2. Rewrite Eq. (12.4.19) by substituting expressions for M and R in terms of appropriate rate constants, where M represents reaeration and R represents decay of DO due to BOD. Show that, under the assumptions used by Streeter and Phelps, this equation reduces to Eq. (12.4.25).