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Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

Detailed statistics and recommendations for environmental flow components in Big Cypress, including high and low flow division, specific flow recurrence intervals, and calculations for effective discharge and peak flow. Statistical data from 1924-1956 provided.

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Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

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  1. Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress • Indicators of Hydrologic Alteration – Environmental Flow Component (EFC) Appendix D • 2 and 10 year recurrence interval flows Appendix E

  2. Indicators of Hydrologic Alteration – Environmental Flow Component (EFC) • Divides the hydrograph into high flow (>75th percentile) and low flow (<50th percentile) • High flows are further divided into Large Floods (10 year recurrence), Small Floods (2 year recurrence) and High Flow Pulses (rise faster than 25% and fall faster than 10%) • Low flows also include Extreme Low Flows (<10th percentile) • Percentile statistics of the low flows for each month are also generated

  3. ECF Defaults

  4. IHA-EFC Statistics for Big Cypress 1924-1956 (33 years)

  5. IHA-EFC Statistics for Little and Black Cypress

  6. 2 – year recurrence interval (1.5 - 4 year) • Bank Full Flow – Flushing accumulated fine sediments from gravel, scouring pools, building riffles, removing vegetation from active channel inundating bars and maintaining channel capacity. • Effective Discharge – Flow that transports the largest amount of sediment when averaged over time.

  7. High Flow Calculations • IHA calculates high flow stats based on daily average flows, by default the 2 year and 10 year recurrence intervals. • PeakFQ – USGS program to Flood Frequency using log-pearson Type III regression based on instantaneous annual peaks

  8. Big Cypress High Flow Recurrence

  9. Big, Little and Black High Flow Recurrence

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