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

Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

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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. Indicators of Hydrologic Alteration – Environmental Flow Component (EFC). - PowerPoint PPT Presentation

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Page 1: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

Flow Statistics used to Develop Flow Statistics used to Develop Building Blocks Recommendations Building Blocks Recommendations

for Big Cypressfor Big Cypress

Indicators of Hydrologic Alteration – Indicators of Hydrologic Alteration – Environmental Flow Component (EFC) Environmental Flow Component (EFC) Appendix DAppendix D

2 and 10 year recurrence interval flows 2 and 10 year recurrence interval flows Appendix EAppendix E

Page 2: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

Indicators of Hydrologic Alteration – Indicators of Hydrologic Alteration – Environmental Flow Component (EFC)Environmental Flow Component (EFC)

Divides the hydrograph into high flow (>75Divides the hydrograph into high flow (>75 thth percentile) and low flow (<50percentile) and low flow (<50 thth percentile) percentile)

High flows are further divided into Large Floods High flows are further divided into Large Floods (10 year recurrence), Small Floods (2 year (10 year recurrence), Small Floods (2 year recurrence) and High Flow Pulses (rise faster recurrence) and High Flow Pulses (rise faster than 25% and fall faster than 10%)than 25% and fall faster than 10%)

Low flows also include Extreme Low Flows Low flows also include Extreme Low Flows (<10(<10thth percentile) percentile)

Percentile statistics of the low flows for each Percentile statistics of the low flows for each month are also generatedmonth are also generated

Page 3: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

ECF DefaultsECF Defaults

Page 4: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

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

EFC Low Percentiles Low Flow Building Blocks

25th 50th 75th Dry Normal Wet

Jan 116 268 396 90 268 396

Feb 195 347 500 90 347 500

Mar 218 389 536 218 390 536

Apr 198 333 444 198 330 445

May 114 150 264 114 150 264

Jun 49 79 140 49 79 140

Jul 13 39 70 13 35 70

Aug 6 12 41 6 40 41

Sep 6 12 32 6 40 40

Oct 6 26 49 40 40 49

Nov 26 56 94 90 90 94

Dec 61 117 275 90 117 275

Page 5: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

IHA-EFC Statistics for IHA-EFC Statistics for Little and Black CypressLittle and Black Cypress

EFC Monthly Low Flows

Little Cypress Black Cypress

1947-2005 (59 years) 1969-2005 (37 years)

25% 50% 75% 25% 50% 75%

January 112 242 462 125 222 322

February 186 417 570 201 300 366

March 219 415 548 242 306 382

April 158 287 466 140 205 327

May 86 155 320 80 156 210

June 38 96 179 42 95 191

July 12 26 80 11 32 63

August 1 10 30 1 5 14

September 1 10 33 1 4 19

October 5 19 53 4 13 45

November 18 65 133 19 74 158

December 68 144 250 91 209 294

Page 6: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

2 – year recurrence interval 2 – year recurrence interval (1.5 - 4 year)(1.5 - 4 year)

Bank Full Flow – Flushing accumulated Bank Full Flow – Flushing accumulated fine sediments from gravel, scouring fine sediments from gravel, scouring pools, building riffles, removing vegetation pools, building riffles, removing vegetation from active channel inundating bars and from active channel inundating bars and maintaining channel capacity.maintaining channel capacity.

Effective Discharge – Flow that transports Effective Discharge – Flow that transports the largest amount of sediment when the largest amount of sediment when averaged over time.averaged over time.

Page 7: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

High Flow CalculationsHigh Flow Calculations

IHA calculates high flow stats based on IHA calculates high flow stats based on daily average flows, by default the 2 year daily average flows, by default the 2 year and 10 year recurrence intervals.and 10 year recurrence intervals.

PeakFQ – USGS program to Flood PeakFQ – USGS program to Flood Frequency using log-pearson Type III Frequency using log-pearson Type III regression based on instantaneous annual regression based on instantaneous annual peakspeaks

Page 8: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

Big Cypress High Flow RecurrenceBig Cypress High Flow Recurrence

Recurrence Interval IHA PeakFQ

Building Blocks

1.5-year 4,2072-year 11,165 6,485 6,0005-year 15,04010-year 36,800 23,300 20,000

Page 9: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

Big, Little and Black High Flow Big, Little and Black High Flow RecurrenceRecurrence

Recurrence Interval Big Little Black1.5-year 4,207 3,031 2,2702-year 6,485 4,389 3,2635-year 15,040 8,955 6,19910-year 23,300 12,930 8,376

Page 10: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress
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Page 13: Flow Statistics used to Develop Building Blocks Recommendations for Big Cypress

Big CypressPercentiles from all days Percentiles from monthly medians Differences

0.25 0.5 0.75 0.25 0.5 0.75 0.25 0.5 0.75J an 103 195 327 116.1 267.8 395.9 13 73 69Feb 173 283 452 195.1 346.5 500 22 64 48Mar 144 225.5 419.25 218.3 389 535.5 74 164 116Apr 117 202 407 197.5 332.5 444 81 131 37May 86 132 209 113.5 150 263.5 28 18 55J un 26 63.5 115.75 48.88 79 139.6 23 16 24J ul 10 29 73 12.5 39 69.5 3 10 -4Aug 4.2 11 37 5.8 11.5 41 2 1 4Sep 3.1 9 30 5.65 12.25 31.5 3 3 2Oct 4.375 15 42 6.075 26 49 2 11 7Nov 17 46 100.5 26 56 93.5 9 10 -7Dec 53 91 162 61.25 117 274.8 8 26 113

Little CypressPercentiles from all days Percentiles from monthly medians Differences

0.25 0.5 0.75 0.25 0.5 0.75 0.25 0.5 0.75J an 85 160 263 111.5 242 461.8 27 82 199Feb 114 209 427.25 185.5 416.5 570 72 208 143Mar 158 253 452 219 415 547.8 61 162 96Apr 129 227 399 157.5 287 466 29 60 67May 76 131 279.5 85.75 154.5 319.5 10 24 40J un 25 75 155 38.38 95.75 178.8 13 21 24J ul 6.8 24 79 12 26 79.5 5 2 1Aug 0.62 7.1 28 1.25 9.5 29.75 1 2 2Sep 0.06 4.2 27 1.275 10.1 33 1 6 6Oct 0.125 10 38 4.6 19 53 4 9 15Nov 9.125 47 106.75 18.25 64.5 132.5 9 18 26Dec 55 106 197 68 144 250 13 38 53

Black CypressPercentiles from all days Percentiles from monthly medians Differences

0.25 0.5 0.75 0.25 0.5 0.75 0.25 0.5 0.75J an 115 159 273 125.1 221.5 322.4 10 63 49Feb 152 263 338 200.8 299.5 366.3 49 37 28Mar 186.75 263 342 242 306 382 55 43 40Apr 131 183 286.5 139.8 205 327 9 22 41May 56 122 195.25 80.25 155.8 209.5 24 34 14J un 16 73 140 42.25 95 190.5 26 22 51J ul 4.7 25 63 10.75 32 63.38 6 7 0Aug 0.58 4.5 20.5 1.4 4.575 14 1 0 -7Sep 0.02 1.4 10 1.213 3.6 19.38 1 2 9Oct 0.5 7.6 36 4.2 13 44.5 4 5 9Nov 17 55 133 19.38 73.75 157.8 2 19 25Dec 68 122 228.5 90.75 208.8 294.3 23 87 66