FLORIDA GEOLOGICAL SURVEY LOW-FLOW FREQUENCY Example: For a IO-year recurrence interval the I-day minimum flow is 213cfs and the 12-month minimum flow is 513cfs 1.5 2 3 4 6 8 10 20 30 RECURRENCE INTERVAL, IN YEARS Figure 30. Low-flow frequency curves for Big Coldwater Creek near Milton, 1938-61. 1200 1100 600 500 300 200 105 LI