Options and their Potential to Impact Hydrology

South Florida Water Management DistrictFebruary 2, 2016

South Dade Investigations To Date

The forum has provided an opportunity to understandgoals in the South Dade area and expand our commonunderstanding of water resource challenges and possibleopportunities to improve conditions

Discussions and early technical investigations identified anumber of options for potential improvement

Many of these options also identified risk to systemresource management objectives

Further technical efforts have realized the potential ofimprovements and reduced potential risks such that manyrobust combinations of options are feasible

South Dade: Defining the Challenge

Note: Graphics are conceptual and intended to show general performance,not all of the system details or variations in spatial performance.

Objectives Water levels managed

independently west and east ofL-31N and C-111 (by canalsand/or detestation areas and/orseepage walls)

Lower water levels in developedareas

Reduce flow at S-331 location,but provide flow to BNP, ENPand Florida Bay

GenerallyWetter

GenerallyDrier

Color Legend

S-331

Current Infrastructure &Getting Water Where Needed

Some dry seasoncapacity available forL-31N pump stations(S-332 B,C,D); limitedefficiency gains withsurface waterdischarge

Some potential forimproved dischargesvia S-332D and/or S-200 toward TaylorSlough

Limited dry seasoncapacity for C-111pump stations (S-200,S-199)

Some capacity tomove water easttoward BiscayneBay via S-338,S-194, S-196

Capacity exists toutilize S-176 andS-177 morefrequently

Limited options toconvey more waternear S-178

Capacity availableat S-197. Releasescan be undesirable

S-200

S-199

S-332

S-176

Aerojet Canal

S-178

Lots of Options!!

S-194

S-196

Regional Evaluation of POC3: October Stage Difference Maps

Wet: WY1970 Dry: WY1971 Average: WY1976

RECAP of early work:For example: Generally lowerswater levels east of L31N/C111

while promoting flow towardTaylor Slough and Florida Bay

Regional Evaluation of POC3 : April Stage Diff Maps

Wet: WY1970 Dry: WY1971 Average: WY1976

DRAFT

RECAP of early work:For example: Caution needed as late dry

season water levels are lower not just in eastof L31N/C11, but also in the Everglades,Biscayne Bay Coastal Wetlands and the

Model Lands/ Southern Glades

South Dade Investigations –Turning The Corner

Further technical efforts have realized the potential ofproposed improvements and reduced potential risks suchthat many robust combinations of options are feasible

The subsequent slides will demonstrate a combination offeatures that realize the intended trends in performanceby reducing water levels in flooded agricultural areaswhile delivering water to and retaining water in naturalsystems.

This example avoids unintended adverse impacts andprovides insight into operational strategies that allow forrobust performance improvements both independent ofand as infrastructure improvements are realized.

Scenarios to Be Presented

Scenario “Step 2A0”

Similar toanticipatedIncrement 2conditions

Includes:

Increment 1operations

+ Contracts 8+8A

+ Raises L29 maxstage to 8.5

S-200

S-199

S-332

S-176

Aerojet Canal

S-178

Scenario “Step 2A3”

Includes Step 2A0features, plus:

Lower operations atS332s, S199s and S200sfor Aug-Dec and transitionto current ops Jan1-Feb15

Additional unit with 75cfseach for S199 and S200

Revised operations toallow more frequent,lower capacity opening ofS176 and S177

Infrastructureimprovement to promoteflows toward TaylorSlough

Add 200 cfs pumpdownstream of S178

Stage Difference Maps Compared to Increment 1Wet Year (WY1970) : October

Step 2A0 Step 2A3

Stage Difference Maps Compared to Increment 1Dry Year (WY1971) : October

Step 2A0 Step 2A3

Stage Difference Maps Compared to Increment 141 year average: October

Step 2A0 Step 2A3

Stage Difference Maps Compared to Increment 1Wet Year (WY1970) : December

Step 2A0 Step 2A3

Stage Difference Maps Compared to Increment 1Dry Year (WY1971) : December

Step 2A0 Step 2A3

Stage Difference Maps Compared to Increment 141 year average: December

Step 2A0 Step 2A3

Stage Difference Maps Compared to Increment 1Wet Year (WY1970) : April

Step 2A0 Step 2A3

Stage Difference Maps Compared to Increment 1Dry Year (WY1971) : April

Step 2A0 Step 2A3

Stage Difference Maps Compared to Increment 141 year average: April

Step 2A0 Step 2A3

Flows Toward Taylor Slough

2.0

2.5

3.0

3.5

4.0

4.5

Aug Sep Oct Nov Dec Jan Feb Mar Apr

Seasonal Pattern in S177 Headwater

Increment 1

Sta

ge

(ft)

Average

+ 1Std Dev

- 1Std Dev

2.0

2.5

3.0

3.5

4.0

4.5

Aug Sep Oct Nov Dec Jan Feb Mar Apr

Seasonal Pattern in S177 Headwater

Increment 1

Step 2A3

Sta

ge

(ft)

Average

+ 1Std Dev

- 1Std Dev

2.0

2.5

3.0

3.5

4.0

4.5

Aug Sep Oct Nov Dec Jan Feb Mar Apr

Seasonal Pattern in S177 Headwater

Increment 1

Step 2A3

Sta

ge

(ft)

Average

+ 1Std Dev

- 1Std DevCanal maintenance level to prevent

water supply or sea level rise impacts.

1.0

2.0

3.0

4.0

5.0

6.0

7.0

Aug Sep Oct Nov Dec Jan Feb Mar Apr

Seasonal Pattern at NTS1(in Everglades National Park)

Increment 1

Sta

ge

(ft)

Average

+ 1Std Dev

- 1Std Dev

1.0

2.0

3.0

4.0

5.0

6.0

7.0

Aug Sep Oct Nov Dec Jan Feb Mar Apr

Seasonal Pattern at NTS1(in Everglades National Park)

Increment 1

Step 2A3

Sta

ge

(ft)

Average

+ 1Std Dev

- 1Std Dev

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

Aug Sep Oct Nov Dec Jan Feb Mar Apr

Seasonal Pattern in Taylor Slough Flows(Transect 23B)

Da

ilyS

urf

ace

Flo

w(c

fs)

Average

+ 1Std Dev

- 1Std Dev

Increment 1

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

Aug Sep Oct Nov Dec Jan Feb Mar Apr

Seasonal Pattern in Taylor Slough Flows(Transect 23B)

Da

ilyS

urf

ace

Flo

w(c

fs)

Increment 1

Step 2A3

Average

+ 1Std Dev

- 1Std Dev

Premise of Operational Changes areRobust Across a Range of Conditions

Average DecemberStep 2A3 withL29 @ 7.5 ft

Average AprilStep 2A3 withL29 @ 7.5 ft

For example: If changes similar to Step2A3 are analyzedfor a condition where L29 is still constrained at 7.5 ft,similar trends in performance are observed.

Average DecemberStep 1B

Average AprilStep 1B

Premise of Operational Changes areRobust Across a Range of Conditions

For example: In a scenario with no infrastructureimprovement and only limited, event-based operationalchanges, positive trends are observed with no impacts.

Average DecemberStep 3A2

Average AprilStep 3A2

Premise of Operational Changes areRobust Across a Range of Conditions

For example: If changes similar to Step2A3 are analyzedfor a condition assuming a seepage barrier from S331 toS177 similar trends in performance are observed.

Improvement is AnticipatedAlong a Continuum

CurrentPerformance

FuturePerformance

Moving forward, as opportunities are pursued to improve infrastructure orrevisit operations in the South Dade area, the South Dade Investigationswork has demonstrated that enhanced operations can leverage availableinfrastructure to move toward identified objectives and provide benefit toboth managed and natural systems.

Why Does This Work?

Rather than relying on flowsprimarily to the south (as inearly operations of theSDCS) or primarily to thewest (as in IOP or ERTP),the operations demonstratedtoday balance the use of bothsets of infrastructure

Improvements in seasonaland event-based operationsmake these operationsrobust across a broad rangeof conditions andinfrastructure.

QUESTIONS AND DISCUSSION