Post on 25-May-2020
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