Lake Okeechobee Regulation Schedule Study LORSS

1
Lake Okeechobee RegulationSchedule Study (LORSS)

• Overview of Preliminary Alternatives
• and Identification of Alternatives in the Final
  Array

2
Current Lake OkeechobeeRegulation Schedule WSE
3
Current Lake OkeechobeeRegulation Schedule WSE
4
Current Lake OkeechobeeRegulation Schedule WSE
5
Assumptions for Alternative Modeling

• Average annual deliveries to STA-3/4 may not
  exceed treatment capacity
• Identified by SFWMD based on current nutrient
  levels in Lake Okeechobee
• 58457 acre-feet (wet season) 4722 a-f (dry
  season)
• SSM line lowered by 1.0 feet from current SFWMD
  line
• SFWMD recommendation as surrogate for 2006 SSM
  study, to be completed based
  on LORS TSP
• Base condition (2007LORS) assumes current SSM
  line
• All alternatives were developed from the 2007
  LORS base condition and include temporary forward
  pumps
• 600 cfs at S-351 (Hillsboro, NNR canals)
• 400 cfs at S-352 (WPB canal)
• 400 cfs at S-354 (Miami Canal)
• Backflow from St. Lucie canal to Lake O. is
  allowed at lake stages of 14.50 feet NGVD29 or
  0.25 feet below the bottom of the lowest
  non-baseflow regulatory zone, whichever is lower
• Operations developed to achieve similar
  performance to base condition, while seeking to
  avoid frequent oscillation between regulatory
  releases and backflow releases at S-308
• Base condition (2007LORS) assumes backflow below
  14.50 feet, which is always more than 0.25 feet
  below the lowest regulatory release zone (Zone D)
  under WSE
• Lowest non-baseflow zone defined as follows
  (refer to the following alternative slides)
• alt1a alt1aS1 alt1aS2 alt1b alt1bS1 alt1bS2
  alt2b and alt4 Zone D1
• alt2a cyan zone alt3 Zone D

6
LORS Exisiting Conditions and Future With
Operations Modified alternatives

• 2007 LORS is the existing condition for the
  LORS study
• WSE regulation schedule
• Temporary forward pumps are included
• SSM line unchanged from current (2006)
• LORS-FWO is the future with operations
  modifications project alternative
• Formulated on 25 May 2006
• WSE regulation schedule, modified to include
  17.25 criteria and zone for 450 cfs base flow to
  Caloosahatchee Estuary
• up to maximum releases to tidewater (Zone A) if
  lake stage gt 17.25
• Base flow zone extends to elevation 12.56-13.00,
  as assumed for alternative 2a and 4 (see
  alternative 2a for additional details)
• SSM line is assumed lowered by 1.0 feet, as for
  all alternatives

7
LORS future with operations modified alternative
8
LORS Alternative 1a

• The reshaping of the line representing the divide
  between Zone D and Zone E.
• Quicker response in the autumn and winter months
  to large inflows that often are generated during
  the hurricane season.
• The bottom of Zone D is flattened during the
  periods in which the estuary ecological systems
  may be more impacted by large freshwater
  discharges especially in late winter and early
  spring, and also during the October through
  November period.
• Applying tributary hydrologic conditions that
  represent longer term wet or dry conditions that
  have persisted in the tributaries.
• Avoid frequent breaks in the regulatory outflows
  that may occur due to shorter dry periods.
• The Palmer Drought Index is proposed to replace
  the 30-day net rainfall
• The 14-day mean Lake Okee. net inflow is proposed
  to replace the 14-day mean S-65E flow.
• Allow Base flow when Lake Okeechobee water levels
  are in Zone D0 or above, but no baseflow releases
  when the stage falls below the bottom of Zone D
  (Zone D0). \
• Baseflow to Caloosahatchee Estuary is measured at
  S-79
• minimum or no risk to the water supply objective
  as the forward pumps are put into place to allow
  for water supply at lower Lake water levels
• Potential for significant benefits for Lake
  Okeechobee, and the St Lucie and Caloosahatchee
  Estuaries
• Alternative 1a sensitivity runs provide increased
  opportunity for baseflow to Estuaries
• Alternative 1aS1 bottom of Zone D0 lowered by
  0.5 feet
• Alternative 1aS2 bottom of Zone D0 lowered by
  1.0 feet

9
alt1aS1 bottom of Zone D0 lowered by 0.5
feet alt1aS2 bottom of Zone D0 lowered by 1.0
feet
10
WSE Operational Guidelines Decision Tree Part 1
Define Lake Okeechobee Discharges to the Water
Conservation Areas
Check Lake Water Level Daily
Apply Tributary Condition Criteria

Apply Multi-Seasonal Climate Outlooks on a
Monthly Basis
In Zone D, Check Desirability of
Releases to the Everglades
Pump Maximum Practicable to WCAs
ZONE A
Maximum Practicable to WCAs
All Downstream WCAs lt max of upper schedule 0.2
5 ft
TRUE
ZONE B
No Discharge to WCAs
FALSE
START Lake Okeechobee Water Level
Maximum Practicable to WCAs
All Downstream WCAs lt max of
upper schedule 0.25 ft
TRUE
ZONE C
No Discharge to WCAs
FALSE
Up to Maximum Practicable to WCAs
Tributary Hydrologic Conditions
Multi- Seasonal Outlook
Desirable OR with minimum Everglades impacts
TRUE
OTHERWISE
NORMAL TO VERY WET
ZONE D
No Releases
FALSE
Drought
Note This Decision Tree provides
essential supplementary information to be used in
conjunction with the WSE regulation schedule.
DRY
11
WSE Operational Guidelines Decision Tree Part 2
Define Lake Okeechobee Discharges to Tidewater
(Estuaries)
Apply Tributary Condition Criteria Weekly

Check Special Lake Criteria daily as
needed for Zones B D
Apply Meteorological Forecasts on a
Weekly Basis apply Seasonal and Multi-Seasonal
Climate Outlooks on a Monthly Basis
NEW CONDITIONS (ORIGINAL WSE CONDITIONS)
Up to Maximum Discharge Capacity To Tidewater
ZONE A
Water level projected to rise into Zone A (WET
TO VERY WET)
Up to 30 day Meteorological Forecast
Very WET (EXTREMELY WET)
Zone B Steady Flow S-80 Up to 3500cfs S-77 Up to
6500cfs
Tributary Hydrologic Conditions
WET TO VERY WET
NORMAL TO WET (NORMAL TO VERY WET)
NORMAL TO DRY
Seasonal Climate Outlook
ZONE B
Up to Maximum Pulse Release to the Estuaries
FALSE
NORMAL TO VERY WET
NORMAL TO DRY
Up to 30 day Meteorological Forecast
Lake Less than 17.5 its the Dry Season
TRUE
DRY
DRY
START Lake Okeechobee Water Level
Up to Zone B S-80 Up to 3500cfs S-77 Up to 6500cfs
Up to 30 day Meteorological Forecast
Water level projected to rise into Zone B (WET
TO VERY WET)
VERY WET (EXTREMELY WET)
Zone C Steady Flow S-80 Up to 2500cfs S-77 Up to
4500cfs
Tributary Hydrologic Conditions
NORMAL TO DRY
NORMAL TO WET (WET TO V.WET)
ZONE C
NORMAL TO VERY WET
EITHER FORECAST INDICATES NORMAL TO VERY
WET (WET TO VERY WET)
Up to Maximum Pulse Release to the Estuaries

Seasonal Climate Outlook Meteorological
Forecast
Multi- Seasonal Climate Outlook
Drought DRY (NORMAL TO DRY)
BOTH FORECASTS INDICATE DRY (NORMAL TO DRY)
BASE FLOW (No Discharge)
DRY
Lake Stage within 1.0 (.5)feet of Zone C
Seasonal Climate Outlook
Up to Zone C S-80 Up to 2500cfs S-77 Up to 4500cfs
VERY WET
TRUE
VERY WET (X. WET)
Tributary Hydrologic Conditions
OTHERWISE
FALSE
WET (WET to V.WET)
ZONE D
TRUE
Lake Stage within 0.5 feet of Zone C
Seasonal Climate Outlook
WET TO VERY WET
Multi- Seasonal Climate Outlook
NORMAL OR WETTER (VERY WET)
Up to Maximum Pulse Release to the Estuaries
FALSE
NORMAL
Note This Decision Tree provides essential
supplementary information to be used in
conjunction with the WSE regulation schedule.
Moderate Drought DRY (DRY)
OTHERWISE
BASE FLOW (No Discharge)
OTHERWISE (NORMAL TO DRY)
Severe Drought Very Dry Conditions may require
that releases to tidewater be discontinued
12
Definition of Tributary conditions based on the
Palmer Index and Net Inflow
The wettest of the two indicators describes the
current tributary condition For modeling
purposes, the dry and very dry classes can be
combined into one class
The Net Inflow is represented by NI RF ET
Inflows, where RF rainfall over the lake, ET
lake evapotranspiration, and Inflows all
inflows to the Lake. Using the basic mass
balance equation, the Net Inflow can be
calculated by NI DS Outflows, where DS
storage change, and Outflows measured
outflows The Palmer Index is a meteorological
index that responds to weather conditions that
have been abnormally dry or abnormally wet. The
index is calculated based on precipitation and
temperature data, as well as the local available
water content of the soil. Discussion on Palmer
Index http//www.drought.unl.edu/whatis/indices.h
tmpdsi http//www.cpc.ncep.noaa.gov/products/anal
ysis_monitoring/cdus/palmer_drought/wpdanote.shtml
Current Conditions http//www.cpc.ncep.noaa.gov
/products/analysis_monitoring/regional_monitoring/
palmer.gif
Draft
13
LORS Alternative 1b

• Developed from alternative 1a, with the following
  changes
• The bottom of regulatory zones A, B, and C are
  lowered, resulting in a more
• pro-active schedule to limit high water
  conditions in Lake Okeechobee
• Reduced moderate to extreme high discharges to
  St. Lucie Estuary
• Zone B maximum discharge at S-80 lowered from
  3500 to 2800 cfs
• Zone C maximum discharge at S-80 lowered from
  2500 to 1800 cfs
• Alternative 1 sensitivity runs provide increased
  opportunity for baseflow to Estuaries
• Alternative 1bS1 bottom of Zone D0 lowered by
  0.5 feet
• Alternative 1bS2 bottom of Zone D0 lowered by
  1.0 feet
• Alternative 1bS2 modification on 15 May 2006, to
  include 17.25 criteria
• up to maximum releases to tidewater (Zone A) if
  lake stage gt 17.25
• Modified alternative 1bS2 alternative
  1bS2-A17.25

14
alt1bS1 bottom of Zone D0 lowered by 0.5
feet alt1bS2 bottom of Zone D0 lowered by 1.0
feet
15
Alternative 1bS2-A17.25
16
LORS Alternative 1bS2-m

• Alternative 1bS2 modification on 19 June 2006
• Target of zero days above 17.25 stage in Lake
  Okeechobee, based on simulation
• period-of-record (1965-2000)
• Alternative 1bS2-A17.25 simulation output showed
  17.25 stage exceeded for 12 days
• Modified alternative alternative 1bS2-m
• Developed from alternative 1bS2-A17.25, with the
  following changes
• 1. Regulation zones A, B, and C are lowered
  during the late hurricane season (September 30
  stage breakpoints are changed to November 1)
• 2. Zone B breakpoints were lowered to be mid-way
  between the bottom of Zone A and the bottom of
  Zone C
• 3. Lower the bottom of Zone B by an additional
  0.15 feet (in addition to 2) and lower the
  bottom of Zone C by 0.10 feet, as the above
  modifications were unable to achieve zero
  exceedance of the 17.25 elevation

17
Alternative 1bS2-m
18
LORS Alternative 1b-T1

• Developed from alternative 1bS2-a17.25, with the
  following changes  
• Changed the Lake season break points from
  September 30 to November 1 for the top of the
  High, Intermediate, and Low bands to address the
  potential of late season hurricanes.
• Changed the Level III pulse measured at S-77 from
  average daily flow of 3000 cfs to 2800 cfs.
• Included a base flow of 350 cfs to the St Lucie
  measured at S-80 in low and intermediate bands.
• Changed the base flow on the Caloosahatchee from
  Up to 450 at S-79 to Up to 650 cfs measured at
  S-77 in the low and intermediate bands.
• No changes to base flow of 450 cfs measured at
  S-79 in the base flow band.
• Raised the bottom of the base flow band by 0.25
  feet.
• Change the High and Intermediate band flow of Up
  to 2800 cfs measured at S-80 back to WSE level of
  Up to 3500 cfs.

19
Lake Okeechobee Operational Guidance (1B-T1) Part
2 Establish Allowable Lake Okeechobee Releases
to Tide (Estuaries)
Note This operational guidance provides
essential supplementary information to be used in
conjunction with other supporting documentation
including text within the Water Control Plan.
Apply Meteorological Forecasts on a
Weekly Basis apply Seasonal and Multi-Seasonal
Climate Outlooks on a Monthly Basis
Check Special Lake Criteria daily as needed
Apply Tributary Hydrologic Condition (THC)
NEW CONDITIONS
Up to Maximum Discharge Capacity To Tidewater
High Lake Mgt
Lake level projected to rise to High Lake Mgt
Up to 30 day Meteorological Forecast
Very WET
S-77 Up to 6500cfs S-80 Up to 3500cfs
Tributary Hydrologic Conditions
WET TO VERY WET
NORMAL TO WET
NORMAL TO DRY
Seasonal Climate Outlook
High
S-77 Up to 2800 cfs S-80 Up to 1170 cfs Pulse
Release
NORMAL TO VERY WET
NORMAL TO DRY
Up to 30 day Meteorological Forecast
DRY
DRY
START Lake Okeechobee Level
S-77 Up to 6500cfs S-80 Up to 3500cfs
Up to 30 day Meteorological Forecast
Lake level projected to rise to High
VERY WET
S-77 Up to 4500cfs S-80 Up to 1800cfs
Tributary Hydrologic Conditions
NORMAL TO DRY
NORMAL TO WET
Intermediate
EITHER FORECAST INDICATES NORMAL TO VERY WET
NORMAL TO VERY WET
S-77 Up to 2800 cfs S-80 Up to 1170 cfs Pulse
Release

Seasonal Climate Outlook Meteorological
Forecast
Multi- Seasonal Climate Outlook
DRY
BOTH FORECASTS INDICATE DRY
S-77 Up to 650 cfs S-80 Up to 350 cfs
Lake Stage within 1.0 feet of Intermediate
Seasonal Climate Outlook
DRY
S-77 Up to 4500cfs S-80 Up to 1800cfs
VERY WET
TRUE
VERY WET (X. WET)
Tributary Hydrologic Conditions
OTHERWISE
FALSE
WET
Low
Seasonal Climate Outlook
WET TO VERY WET
Multi- Seasonal Climate Outlook
NORMAL OR WETTER
Figure 6
S-77 Up to 2800 cfs S-80 Up to 1170 cfs Pulse
Release
S-79 Up to 450 cfs
NORMAL
DRY
S-77 Up to 650 cfs S-80 Up to 350 cfs
OTHERWISE
OTHERWISE (NORMAL TO DRY)
Base Flow
Very Dry Conditions may require that releases
to tidewater be discontinued
20
Lake Okeechobee Management Bands (1B-T1)(To
include water supply demand releases)
HIGH LAKE MANAGEMENT BAND
High
Intermediate
Low
OPERATIONAL BAND
Base Flow
No Flow
Lake Okeechobee Water Shortage Management Band
Figure 4
21
LORS Alternative 1b-T2

• Developed from alternative 1bS2-a17.25, with the
  following changes  
• Zone D0 raised to 12.6 (Zone D0 should be higher
  than navigation minimum of 12.56)
• 2.  All CE pulse releases measured at S79 instead
  of S77 (in all lake bands when pulse releases are
  called for)
•     (to reduce high flow exceedences caused by
  lake release plus runoff)
• 3.  Bottom of Zone D1 lowered by 1/2 ft (to
  encourage more pulse releases which help reduce
  steady high discharges)
• 4.  Add a small baseflow of 200 cfs (ie, low
  volume regulatory discharge) at S-80 (whenever
  base flow releases are called for in decision
  tree)

22
Lake Okeechobee Operational Guidance (1B-T2) Part
2 Establish Allowable Lake Okeechobee Releases
to Tide (Estuaries)
Note This operational guidance provides
essential supplementary information to be used in
conjunction with other supporting documentation
including text within the Water Control Plan.
Apply Meteorological Forecasts on a
Weekly Basis apply Seasonal and Multi-Seasonal
Climate Outlooks on a Monthly Basis
Check Special Lake Criteria daily as needed
Apply Tributary Hydrologic Condition (THC)
NEW CONDITIONS
Up to Maximum Discharge Capacity To Tidewater
High Lake Mgt
Lake level projected to rise to High Lake Mgt
Up to 30 day Meteorological Forecast
Very WET
S-77 Up to 6500cfs S-80 Up to 2800cfs
Tributary Hydrologic Conditions
WET TO VERY WET
NORMAL TO WET
NORMAL TO DRY
Seasonal Climate Outlook
High
S-79 Up to 3000 cfs S-80 Up to 1170 cfs Pulse
Release
NORMAL TO VERY WET
NORMAL TO DRY
Up to 30 day Meteorological Forecast
DRY
DRY
START Lake Okeechobee Level
S-77 Up to 6500cfs S-80 Up to 2800cfs
Up to 30 day Meteorological Forecast
Lake level projected to rise to High
VERY WET
S-77 Up to 4500cfs S-80 Up to 1800cfs
Tributary Hydrologic Conditions
NORMAL TO DRY
NORMAL TO WET
Intermediate
EITHER FORECAST INDICATES NORMAL TO VERY WET
NORMAL TO VERY WET
S-79 Up to 3000 cfs S-80 Up to 1170 cfs Pulse
Release

Seasonal Climate Outlook Meteorological
Forecast
Multi- Seasonal Climate Outlook
DRY
BOTH FORECASTS INDICATE DRY
S-79 Up to 450 cfs S-80 Up to 200 cfs
Lake Stage within 1.0 feet of Intermediate
Seasonal Climate Outlook
DRY
S-77 Up to 4500cfs S-80 Up to 1800cfs
VERY WET
TRUE
VERY WET (X. WET)
Tributary Hydrologic Conditions
OTHERWISE
FALSE
WET
Low
Seasonal Climate Outlook
WET TO VERY WET
Multi- Seasonal Climate Outlook
NORMAL OR WETTER
Figure 6
S-79 Up to 3000 cfs S-80 Up to 1170 cfs Pulse
Release
S-79 Up to 450 cfs S-80 Up to 200 cfs
NORMAL
DRY
S-79 Up to 450 cfs S-80 Up to 200 cfs
OTHERWISE
OTHERWISE (NORMAL TO DRY)
Base Flow
Very Dry Conditions may require that releases
to tidewater be discontinued
23
Lake Okeechobee Management Bands (1B-T2)(To
include water supply demand releases)
HIGH LAKE MANAGEMENT BAND
High
Intermediate
Low
OPERATIONAL BAND
Base Flow
No Flow
Lake Okeechobee Water Supply Management Band
Figure 4
24
LORS Alternative 1b-T3

• Developed from alternative 1b-T2, with the
  following changes  
• Changed the late season break points from
  September 30 to November 1 for the top of the
  High, Intermediate, and Low bands to address the
  potential of late season hurricanes (consistent
  with alternative T1)
• Inclusion of an Oct. 1 breakpoint at 13.0 feet
  for the bottom of the baseflow zone D0
  (consistent with original LORS alternatives 2a
  and 4 to provide some protection to low lake
  levels at the end of the wet season)
• Increased CRE Level 1 pulse level from average
  daily rate of 1600 cfs to 2000 cfs (allows for
  increased releases below 2800 cfs to reduce
  higher lake levels and the associated higher
  releases)
• Increased CRE Level 2 pulse level from average
  daily rate of 2300 cfs to 2500 cfs (allows for
  increased releases below 2800 cfs to reduce
  higher lake levels and the associated higher
  releases)
• CRE Level 3 pulse level unchanged, at average
  daily rate of 3000 cfs
• Reduce maximum CRE discharges from 4500 cfs to
  4000 cfs when the Lake Okeechobee stage is within
  the intermediate (THC condition normal to wet)
  or low (THC condition very wet) bands.

25
Lake Okeechobee Operational Guidance (1B-T3) Part
2 Establish Allowable Lake Okeechobee Releases
to Tide (Estuaries)
Note This operational guidance provides
essential supplementary information to be used in
conjunction with other supporting documentation
including text within the Water Control Plan.
Apply Meteorological Forecasts on a
Weekly Basis apply Seasonal and Multi-Seasonal
Climate Outlooks on a Monthly Basis
Check Special Lake Criteria daily as needed
Apply Tributary Hydrologic Condition (THC)
NEW CONDITIONS
Up to Maximum Discharge Capacity To Tidewater
High Lake Mgt
Lake level projected to rise to High Lake Mgt
Up to 30 day Meteorological Forecast
Very WET
S-77 Up to 6500cfs S-80 Up to 2800cfs
Tributary Hydrologic Conditions
WET TO VERY WET
NORMAL TO WET
NORMAL TO DRY
Seasonal Climate Outlook
High
S-79 Up to 3000 cfs S-80 Up to 1170 cfs Pulse
Release
NORMAL TO VERY WET
NORMAL TO DRY
Up to 30 day Meteorological Forecast
DRY
DRY
START Lake Okeechobee Level
S-77 Up to 6500cfs S-80 Up to 2800cfs
Up to 30 day Meteorological Forecast
Lake level projected to rise to High
VERY WET
S-77 Up to 4000cfs S-80 Up to 1800cfs
Tributary Hydrologic Conditions
NORMAL TO DRY
NORMAL TO WET
Intermediate
EITHER FORECAST INDICATES NORMAL TO VERY WET
NORMAL TO VERY WET
S-79 Up to 3000 cfs S-80 Up to 1170 cfs Pulse
Release

Seasonal Climate Outlook Meteorological
Forecast
Multi- Seasonal Climate Outlook
DRY
BOTH FORECASTS INDICATE DRY
S-79 Up to 450 cfs S-80 Up to 200 cfs
Lake Stage within 1.0 feet of Intermediate
Seasonal Climate Outlook
DRY
S-77 Up to 4000cfs S-80 Up to 1800cfs
VERY WET
TRUE
VERY WET (X. WET)
Tributary Hydrologic Conditions
OTHERWISE
FALSE
WET
Low
Seasonal Climate Outlook
WET TO VERY WET
Multi- Seasonal Climate Outlook
NORMAL OR WETTER
Figure 6
S-79 Up to 3000 cfs S-80 Up to 1170 cfs Pulse
Release
S-79 Up to 450 cfs S-80 Up to 200 cfs
NORMAL
DRY
S-79 Up to 450 cfs S-80 Up to 200 cfs
OTHERWISE
OTHERWISE (NORMAL TO DRY)
Base Flow
Very Dry Conditions may require that releases
to tidewater be discontinued
26
Lake Okeechobee Management Bands (1B-T3)(To
include water supply demand releases)
HIGH LAKE MANAGEMENT BAND
High
Intermediate
Low
OPERATIONAL BAND
Base Flow
No Flow
Lake Okeechobee Water Supply Management Band
Figure 4
27
LORS Alternative 2a

• (White)50 Probability of Reaching 17.5 in 90
  days Up to maximum discharge capacity to tide
  and pump maximum practical to WCAs
• (Blue)25 Probability of Reaching 17.5 in 90
  days up to 3500 cfs to the St. Lucie and up to
  6500 cfs to the Caloosahatchee.
• Up to maximum practical releases to the WCAs if
  all WCAs are less than the max of the upper
  schedule plus .25 ft
• (Black)0.8 feet above Optimum Line/13.5 Line to
  25 Probability of Reaching 17.5 in 90 days up
  to 2000 cfs to the St. Lucie and up to 3500 cfs
  to the Caloosahatchee.
• Up to maximum practical releases to the WCAs if
  all WCAs are less than the max of the upper
  schedule plus .25 ft
• (Green)0.4 to 0.8 feet above Optimum/13.5 Line
  Up to 1400 cfs to the St. Lucie and Up to 2300
  cfs to the Caloosahatchee.
• Up to maximum practical releases to the WCAs if
  all WCAs are less than the max of the upper
  schedule plus .25 ft

28

• (Cyan)0 to 0.4 feet above Optimum/13.5 Line Up
  to 800 cfs to the St. Lucie and up to 1600 cfs to
  the Caloosahatchee.
• Up to maximum practical releases to the WCAs if
  all WCAs are less than the max of the upper
  schedule plus .25 ft
• (Magenta)Maximum Probability not to reach SSM
  (10.5-13) Line in 90 days to Optimum/13.5 Line
  Up to 450 cfs to the Caloosahatchee (measured at
  S-79) 50 cfs to St. Lucie Estuary (at S-80), only
  if needed to maintain salinity envelope.
• Releases to WCAs if desirable or with minimum
  Everglades impacts, unless THC drought
  conditions.
• (Orange) Lake O. Stage lt 13.5 and above the
  following breakpoint line
• 1-1 12.56 9-1 12.56 10-1 13.0 12-31
  12.56 (targeted to maintain lake stages above
  12.56 navigation constraint stage and always
  above 2007LORS SSM line) Up to 450 cfs to the
  Caloosahatchee (measured at S-79) 50 cfs to St.
  Lucie Estuary (at S-80), only if needed to
  maintain salinity envelope.
• Zero releases to WCAs.
• No regulatory releases to estuaries or WCAs when
  below breakpoint line.
• (Red) Below the following breakpoint line
• 1-1 12.56 9-1 12.56 10-1 13.0 12-31 12.56
  
• No Lake Regulatory Releases to the estuaries or
  WCAs
• Tributary conditions are evaluated using Palmer
  Drought Index and 2-week total Lake Okeechobee
  inflows, as used in alternatives 1a, 1b, and 4

29
LORS Alternative 2a, updates

• Alternative 2a modification on 15 May 2006, to
  include 17.25 criteria
• up to maximum releases to tidewater (Zone A) if
  lake stage gt 17.25
• Modified alternative 2a alternative 2a-A17.25
• Alternative 2a modification on 25 May 2006, to
  include base flow of 450 cfs to Caloosahatchee
  Estuary only (previously, a base flow of 50 cfs
  to
• St. Lucie Estuary was included in magenta
  and orange zones
• Modified alternative 2a alternative 2a-B
• Alternative 2a modifications on 19 June 2006,
  targeted to reduce the frequency of extreme high
  discharge (gt3000 to STL and gt 4500 to CAL) to the
  estuaries observed with alternatives 2a,
  2a-A17.25, and 2a-B
• Increase releases in Zone Blue from 6500/3500
  (CAL/STL estuarine releases) to 7500/5000
• Change Magenta regulatory releases to 800 cfs
  west / 400 cfs east measured at S-77/80 (Under
  alternative 2a-B, the magenta zone was a zone
  allowing base flow to the Caloosahatchee estuary
  and regulatory releases south to the WCAs)
• Extend Magenta area to include below 13.5 ft to
  optimal line at 12.5 ft, consistent with the
  pre-defined operational guideline
• Change base flow line (bottom of orange zone) to
  match Alt1bS2 base flow zone
• Modified alternative 2a alternative 2a-m

30
LORSS Operational Guidelines Decision Tree Part
1 Define Lake Okeechobee Discharges to the Water
Conservation Areas
Note This Decision Tree provides
essential supplementary information to be used in
conjunction with the regulation schedule.
Check Lake Water Level Daily
Apply Tributary Condition Criteria

In Zone D, Check Desirability of
Releases to the Everglades
Pump Maximum Practicable to WCAs
White
Maximum Practicable to WCAs
TRUE
All Downstream WCAs lt max of upper schedule 0.2
5 ft
START Lake Okeechobee Water Level
Cyan
Blue
Green
Black
No Discharge to WCAs
FALSE
Up to Maximum Practicable to WCAs
TRUE
Desirable OR with minimum Everglades impacts
Tributary Hydrologic Conditions
OTHERWISE
Magenta
No Releases
FALSE
Drought
No Discharges to WCAs
Orange
Red
31
LORS Operational Guidance Part 2 Define Lake
Okeechobee Discharges to Tidewater (Estuaries)
Apply Tributary Condition Criteria Weekly

Apply Meteorological Forecasts on a
Weekly Basis apply Seasonal and Multi-Seasonal
Climate Outlooks on a weekly Basis
Check Special Lake Criteria daily as
needed for Zones B D
Projected to rise box is defined as
Projected to rise in 7 days to the higher
zone without any additional releases greater than
the false release amount
Up to Maximum Discharge Capacity To Tidewater
White
True
Very Wet
Projected to rise into White
False
THC
Otherwise
Up to Blue Release
Blue
True
Very Wet
Projected to rise into Blue
False
Otherwise
THC
START Lake Okeechobee Water Level
Black
Up to Black Releases
True
Very Wet
Projected to rise into Black
THC
False
Wet to Normal
Green
Up to Green Releases
True
Projected to rise into Green
Very Dry
False
Up to Cyan Releases
Lake Stage within .5 feet of Black
Very Wet
True
Up to Green Releases
True
Projected to rise into Green
False
Otherwise
THC
False
Up to Cyan Releases
Cyan
Base Flow
Magenta
Orange
Red
No Releases
Very dry conditions may require that releases to
tidewater be discontinued
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White
Blue
Black
Green
Cyan
Magenta
Orange
Red
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Alternative 2a-A17.25 and Alternative 2a-B
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Alternative 2a-m
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LORS Alternative 2b

• A desired lake stage curve, similar the LO stage
  envelope PM, is the target
• If the lake is below the stage curve, no
  regulatory releases
• If the lake stage increases above the target
  stage, then successive regulatory release zones
  are encountered
• The zones are roughly parallel to the target
  stage curve, and Zone A (maximum releases) is
  reached when the lake stage is roughly two feet
  above the target stage.
• Forecasting, as used in WSE, was also included
• Sensitivity run alt2bS1 increases baseflow
  releases by lowering Zone D1
• Baseflow discharge continues below target lake
  stage
• alt2bS1 breakpoints -- 1-1 13.70 6-1 12.75
  9-15 13.50 12-31 13.70
•  alt2b breakpoints 1-1 15.05 5-31 12.75
  9-15 13.55 10-1 14.55 12-31 15.05

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LORS Alternative 2b

• Summary of Regulatory Release Flows to Estuaries
• Lake Regulatory Zone Caloosahatchee _at_S-77 St.
  Lucie _at_S-308
• Zone A 7800
  cfs 2500 cfs
• Zone B 6500
  2500
• Zone C 4500
  1500
• Zone D3 3000
  1500
• Zone D2 450
  350
• Zone D1 450
  0

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alt2bS1 bottom of Zone D1 lowered below target
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LORS Alternative 3

• Run 22AZE regulation schedule for Lake Okeechobee
• WSE regulation study (2000) environmentally-prefer
  red alternative
• STA treatment constraint (same as all LORS
  alternatives) diminishes the effectiveness of
  this regulation schedule, compared to previous
  schedule revision effort
• Alternative 3 modification on 25 May 2006, to
  include 17.25 criteria and zone for 450 cfs base
  flow to Caloosahatchee Estuary
• up to maximum releases to tidewater (Zone A) if
  lake stage gt 17.25
• Base flow zone extends to elevation 12.56-13.00,
  as assumed for alternative 2a and 4 (see
  alternative 2a for additional details)
• Alternative 3 modification alternative 3-B

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LORS Alternative 3
40
LORS Alternative 3-B
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LORS alternative 4

• COE refinement of SFWMD alternative 1b, including
  the following modifications
• Increase Zone B maximum Lake release to 6500/3500
  and Zone C to 4500/2500
• Lower regulation schedule during late hurricane
  season
• (change breakpoints for Zones A,B,C from 1
  Oct to 1 Nov)
• Change decision tree for Zone C base flow to up
  to Level 2
• Change decision tree for Zone D for THC normal,
  SCO otherwise up to Level 1
• Change decision tree for Zone D for THC normal or
  wet, MSCO otherwise up to Level 1
• Allow base flow releases to Caloosahatchee
  Estuary (450 cfs at S-79) to the following lake
  level 1-1 12.56 9-1 12.56 10-1 13.0 12-31
  12.56
• (releases south to WCAs discontinued below
  Zone D0, as in alt1b)
• Decision tree addition of Hurricane Season
  Outlook with direction to up to 4500/2500 or to
  THC prior to THC (active hurricane season-to be
  defined) to be included in WCP (not able to be
  included in SFWMM at this time)
• Alternative 4 modification on 15 May 2006, to
  include 17.25 criteria
• up to maximum releases to tidewater (Zone A) if
  lake stage gt 17.25
• Modified alternative 4 alternative 4-A17.25

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(No Transcript)
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Alternative 4
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Alternative 4-A17.25
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LORS Final Array of Alternatives(June 2006 TSP
selection)

• Future With Operations Modified Alternative
• Alternative 1bS2-A17.25
• Alternative 1bS2-m (selected as original TSP)
• Alternative 2a-B
• Alternative 2a-m
• Alternative 3-B
• Alternative 4-A17.25

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LORS Final Array of Alternatives(November 2006
TSP update)

• Alternative 1bS2-A17.25
• Alternative 1bS2-m (selected as original TSP)
• Alternative 1b-T1
• Alternative 1b-T2