* Class 1: large flood events: significant damage to structures or agriculture; fatalities; and/or 1-2 decades-long
reported interval since the last similar event, Class 2: very large events: greater than 20 yr but less than 100 year
recurrence interval, and/or a local recurrence interval of at 10-20 yr., Class 3: Extreme events: with an estimated
recurrence interval greater than 100 years