Hp Save & Sub One of two alternatives will be selected to reduce flood damage in a rural community in central Arizona. The estimates associated with each alternative are available. Use analysis at a discount rate of per year over a 20 year study period to determine which alternative should be selected. For analysis purposes only, assume that the benefits of reduced flood damage are available in years, 9, and 18 of the study period Retention Pond Channel Initial Costs Annual Maintenance Sear 880,000 2,900,000 92.000 Reduced Flood Damages 30,000 200.000 600,000 The ABC ratio is The alternative that should be selected is the lake