9) Calculate each standard (B/C) vs. DN and then based on (B/C) stand alone analyses determine which dam height should be selected (use PW for B/C calculations). Greatsville Dam and Recreational Lake (life expectancy is indefinite) Dam Height (ft) Lake Depth (ft) Upfront Cost (M) Annual Cost (M) Annual Revenue/Savings (M) 22 800 21 1 2.7 24 1100 24.6 1.2 3.2 26 1250 28.4 1.4 3.7 i = 8% / yr a. 24 ft., (B/C) = 1.010 b. 22 ft., (B/C) = 1.008 C. 26 ft., (B/C) = 1.007 d. 22 ft., (B/C) = 1.011