update to loxahatchee river coordinating council l-8 reservoir water quality flow-way 1 water...
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Update to Loxahatchee River Coordinating Council
Update to Loxahatchee River Coordinating CouncilL-8 Reservoir Water Quality
Flow-way 1 Water Delivery Test
G-92 Structure Replacement
September 29, 2008
L-8 Reservoir Water Quality
Flow-way 1 Water Delivery Test
G-92 Structure Replacement
September 29, 2008
Parameters
(Cell 3)
Sampling Depth
0.5 m 6.5 m 12.5m
Temperature 27.7 23.4 21.9
D.O. 8.83 6.79 4.39
Specific Conductance
2853 2817 2816
pH 8.3 8.1 7.8
TSS <3 <3 <3
TDS 1649 1644 1328
TKN .81 .97 .87
Tot. Kjeldahl N 0.81 0.97 0.87
Nitrate/Nitrite <0.005 0.123 0.130
Ammonia <0.005 <0.005 <0.005
Total Phosphorus 0.006 0.008 0.023
Ortho-Phosphorus 0.006 0.002 0.005
Chlorides 442 614 633
Sulfate 165 229 236
Parameters
(Cell 6)
Sampling Depth
0.5 m 6.5 m 12.5m
Temperature 27.9 23.4 22.3
D.O. 10 7.36 5.01
Specific Conductance
3801 3809 3835
pH 7.9 7.7 7.6
TSS 5 3 <3
TDS 2275 2247 2317
TKN 1.12 1.07 1.15
Tot. Kjeldahl N 1.0 0.86 0.84
Nitrate/Nitrite 0.118 0.206 0.308
Ammonia <0.005 0.009 <0.005
Total Phosphorus 0.010 0.018 0.022
Ortho-Phosphorus <0.002 <0.002 <0.002
Chlorides 943 895 914
Sulfate 347 329 334
ResultsResultsSimilar to historical for WY 05 – WY 08
Lower concentrations of nutrients in cells than in either L-8 or M-Canal
No metals exceeded WQ criteria
Class I/III criteria exceeded for: Specific conductance, TDS, Chlorides and Gross Alpha
Levels comparable to current cell historical levels – levels of parameters in exceedence are expected to decrease as reservoir is operated
Similar to historical for WY 05 – WY 08
Lower concentrations of nutrients in cells than in either L-8 or M-Canal
No metals exceeded WQ criteria
Class I/III criteria exceeded for: Specific conductance, TDS, Chlorides and Gross Alpha
Levels comparable to current cell historical levels – levels of parameters in exceedence are expected to decrease as reservoir is operated
Site Unit n Average Minimum Maximum
L8MZBN µS/cm 20 768 489 978L8MZBS µS/cm 20 569 480 695
Mixing Zone BoundariesMixing Zone Boundaries
FLOW-WAY 1 TESTFLOW-WAY 1 TEST
PURPOSE: To test water delivery from the regional water system to the Loxahatchee River Basin using the existing infrastructure
TEST DATE - July 1 – July 3, 2008
PURPOSE: To test water delivery from the regional water system to the Loxahatchee River Basin using the existing infrastructure
TEST DATE - July 1 – July 3, 2008
M Canal Widening
Control #2 Pump Station
G-161
Northlake Bridge
G-160
Flow-way #1
Grassy Waters Preserve – M Canal
TEST CRITERIATEST CRITERIA
Establish baseline stages/flow rating curvesControl GWP releases to limit effect on apple
snailsRelease ~150 cfs at Control 2, 100 cfs at G-161,
100 cfs to NWFLRMaintain appropriate stages at GWP, G-161 and
G-160Ensure coordination with stakeholdersMeasure water flow at critical locationsObtain water quality samples during test
Establish baseline stages/flow rating curvesControl GWP releases to limit effect on apple
snailsRelease ~150 cfs at Control 2, 100 cfs at G-161,
100 cfs to NWFLRMaintain appropriate stages at GWP, G-161 and
G-160Ensure coordination with stakeholdersMeasure water flow at critical locationsObtain water quality samples during test
RESULTSRESULTSDATE Calculated Daily average flow (cfs)
CTRL 2 G-161
G-160 G-92 Lainhart Dam
7/1/08 147 41 73 110 128
7/2/08 147 91 160 138 200
7/3/08 143 50 206 71 215
DATE Flow Station
Ctrl 2 G-161 G-160 E. Perimeter
Canal7/2/08 150 - 100 35
7/3/08 - 95 80 -
Measured FlowsMeasured Flows
Measured Avg. Daily Water Levels
Measured Avg. Daily Water Levels
DATE Stage Elevation (feet NGVD)
GWP (G-161 HW)
G-161 TW G-160 HW
7/1/08 18.18 16.14 15.03
7/2/08 18.04 17.12 15.13
7/3/08 18.15 17.10 14.98
ConclusionsConclusionsConfirmed that if replacement water is available,
structures can be operated to deliver flow
Confirmed 150 cfs at control 2, but only 35 cfs at E. perimeter canal
G-161 operated to deliver 100 cfs to C-18
Flow to NWFLR exceeded 100 cfs during test period
Each structure is critical and operation must be synchronized to achieve results
Measured flows agreed with estimated
Confirmed that if replacement water is available, structures can be operated to deliver flow
Confirmed 150 cfs at control 2, but only 35 cfs at E. perimeter canal
G-161 operated to deliver 100 cfs to C-18
Flow to NWFLR exceeded 100 cfs during test period
Each structure is critical and operation must be synchronized to achieve results
Measured flows agreed with estimated
G-92 StructureProposed Design & Location
G-92 StructureProposed Design & Location
New in-kind (single barrel, box culvert) will be installed to maintain flood protection and conveyance
Located adjacent to existing structure Existing structure to be demolished
New in-kind (single barrel, box culvert) will be installed to maintain flood protection and conveyance
Located adjacent to existing structure Existing structure to be demolished
G-92 StructureBackground
G-92 StructureBackground
Structure supplies water from the C-18 canal to the Loxahatchee River via the South Indian River Drainage District canal C-14
Erosion and structure deterioration has limited structure capacity
Failure of the existing structure became critical during 2004 hurricane season
Structure supplies water from the C-18 canal to the Loxahatchee River via the South Indian River Drainage District canal C-14
Erosion and structure deterioration has limited structure capacity
Failure of the existing structure became critical during 2004 hurricane season
G-92 StructureBenefits of New Structure
G-92 StructureBenefits of New Structure
Reliability
Extended service life
Remote operation
Public safety
Flood protection
Water delivery
Reliability
Extended service life
Remote operation
Public safety
Flood protection
Water delivery
G-92 StructureOperation
G-92 StructureOperation
New structure will not deviate from existing operational criteria.
Remote operation through telemetry
New structure will not deviate from existing operational criteria.
Remote operation through telemetry
G-92 Structure Replacement Schedule
G-92 Structure Replacement Schedule
Bid opening scheduled for September 29, 2008 at 2:30 p.m.
Construction start – late November to early December 2008
Construction time frame - 300 days
Bid opening scheduled for September 29, 2008 at 2:30 p.m.
Construction start – late November to early December 2008
Construction time frame - 300 days
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