City of Orlando Little Lake Fairview Restoration

City of Orlando Little Lake Fairview Restoration

DOING (MUCH) MORE WITH LESS
City of Orlando Little Lake Fairview Restoration Performance Three Years After Construction
FSA 2011 Annual Conference
June 8‐10, 2011
Presenter: James Wittig, P.E., CDM
Significant Contributions by Jane M. Williams, P.E., CFM, CDM and Beth K. Whikehart, P.E., CDM
Project Study Area
Lake Fairview
Little Lake Fairview
Dubsdread
Golf Course
Project Design Objectives
• Golf course renovation
• Stormwater retrofit and treatment
• Wetland rehydration
• Stormwater harvesting for irrigation
How did we do?
Little Lake Fairview
Historic Dubsdread Golf Course • Designed in 1923
• Site of the Orlando Open in the 1940s
• Played by such legends as Ben Hogan and Sam Snead
• City of Orlando purchased in 1977
The Old Dubsdread Golf Course
Grand Re‐Opening Ceremony July 10, 2008
The New and Improved Dubsdread Golf Course
Improved Grading has Increased Aesthetics and Playability of the Course
Pre-project
Post-project
Dubsdread
Golf Course –
Before Renovation Pond 15
Dubsdread
Golf Course –
After Renovation
The Driving Range has Become a Stormwater Treatment Facility
Pre-project
New Aqua Range
Dubsdread Golf Course Performance
• Increase in revenue
• Increase in play
• Positive feedback from community
• Winner of ING Honors in Golf Course Architecture category
Stormwater Retrofit and Treatment
Minnesota Ditch
Edgewater Ditch
DW
Pre‐project Water Features
Minnesota Ditch
Edgewater Ditch
Post‐project Water Features
Improved Water Quality of Recharge of Drainage Well
Pre-project Condition
Post-project Condition
Interconnected Design Improves Drainage and Treatment
Stormwater Improvements Result in Reduced Pollutant Loading to Little Lake Fairview
• Pollutant load reductions
– 952 lbs of total nitrogen
– 243 lbs of total phosphorus
Little Lake Fairview Project Provides Many Water Quality Benefits
•
•
•
•
Improved stormwater treatment through design
Additional filtering by wetlands
Improved water quality of discharge to Little Lake Fairview
Improved quality of aquifer recharge
Stormwater Improvements Result in Reduced Pollutant Loading to Little Lake Fairview
Lake Total Nitrogen Level 2007 ‐ 2011
1.20
0.80
0.60
0.40
Project Construction
0.20
Date
Dec‐10
Oct‐10
Aug‐10
Jun‐10
Apr‐10
Feb‐10
Dec‐09
Oct‐09
Aug‐09
Jun‐09
Apr‐09
Feb‐09
Dec‐08
Oct‐08
Aug‐08
Jun‐08
Apr‐08
Feb‐08
Dec‐07
Oct‐07
Aug‐07
Jun‐07
Apr‐07
0.00
Feb‐07
Total Nitrogen (mg/L)
1.00
Stormwater Improvements Result in Reduced Pollutant Loading to Little Lake Fairview (cont.)
Lake Total Phosphorus Level 2007 ‐ 2011
0.020
0.015
0.010
Project Construction
0.005
Date
Dec‐10
Oct‐10
Aug‐10
Jun‐10
Apr‐10
Feb‐10
Dec‐09
Oct‐09
Aug‐09
Jun‐09
Apr‐09
Feb‐09
Dec‐08
Oct‐08
Aug‐08
Jun‐08
Apr‐08
Feb‐08
Dec‐07
Oct‐07
Aug‐07
Jun‐07
Apr‐07
0.000
Feb‐07
Total Phosphorus (mg/L)
0.025
Stormwater Improvements Result in Reduced Pollutant Loading to Little Lake Fairview (cont.)
Lake Trophic State Index 2007 ‐ 2011
100.00
90.00
Hypereutrophic
70.00
60.00
50.00
Eutrophic
Mesotrophic
Oligotrophic
40.00
30.00
20.00
Project Construction
10.00
Date
Dec‐10
Oct‐10
Aug‐10
Jun‐10
Apr‐10
Feb‐10
Dec‐09
Oct‐09
Aug‐09
Jun‐09
Apr‐09
Feb‐09
Dec‐08
Oct‐08
Aug‐08
Jun‐08
Apr‐08
Feb‐08
Dec‐07
Oct‐07
Aug‐07
Jun‐07
Apr‐07
0.00
Feb‐07
Trophic State Index
80.00
Wetland Rehydration
• Benefits: Water quality improvement, restores hydroperiod, promotes a healthy habitat
Little Lake
Fairview
PZ-1
PZ-2
DW
Wetland Boundaries
Wetland Disconnected From Drainage Well Pre-project Condition
Post-project Condition
Little Lake Fairview
Wetland Hydration
Wetland Rehydration
• Multiple pond overflows send treated stormwater to the adjacent wetland
Wetland Monitoring
• Wetland water levels were monitored for more than five years
Wetland Rehydration
• Wetland water levels measured at Piezometer PZ‐1
91.50
91.00
Pre‐Construction Average Stage = 87.94
Post‐Construction Average Stage = 88.85
90.50
Wetland Water Elevation (ft NAVD)
90.00
89.50
89.00
88.50
88.00
87.50
87.00
86.50
86.00
Jan-04
Construction
May-05
Oct-06
Feb-08
Date
Jul-09
Nov-10
Water Conservation Through Stormwater Harvesting
Golf Course Irrigation Parameters
Pre‐project
• 55 acres of irrigatable area
• Two groundwater wells provide all irrigation
Post‐project
• 72 acres of irrigatable area
• Stormwater system is primary irrigation source
• Groundwater wells are back‐up source
• Pump station pumps from Pond 15 to irrigation system
Stormwater Harvesting Components
• 1300‐gpm irrigation pump station
Stormwater Harvesting Components
• Pond 15 acts as a very large wet well
• 1 inch of rainfall results in 6 to 8 inches of rise in Pond 15
Pond 15
Stormwater Harvesting System Operations
• When Pond 15 falls 1 foot below NWL GW pumps kick on to supplement pond
• Back up GW pumps turn off before surface water flow from Pond 15
New Golf Course Irrigation System Constructed
Stormwater Harvesting System Operations
• Pumps computer automated
• Operates 3‐4 times per week
• Runs for 6.5 hours per cycle
• Typically turns on at 10:30 pm
• Puts out 400,000 gallons per cycle
Water Conservation Through Stormwater Harvesting
Total Water Use for Golf Course Irrigation 2001 ‐ 2010 140.0
Annual Total Water Use (MG)
groundwater
120.0
stormwater
100.0
80.0
60.0
40.0
20.0
No
Data
0.0
2001
2002
2003
2004
2005
Year
2006
2007
2008
2009
2010
Water Conservation Through Stormwater Harvesting (cont.)
120.0
Groundwater Use for Golf Course Irrigation 2001 ‐ 2010
Annual Groundwater Use (MG)
Grow‐in period
100.0
After
Construction
Before Construction
80.0
60.0
40.0
20.0
No
Data
0.0
2001
2002
2003
2004
2005
2006
Year
2007
2008
2009
2010
Actual Water Use Versus Permitted and Estimated Water Use
Golf Course Irrigatable Acreage
Total Max
Allowable (MG)
Groundwater Max Allowable (MG)
Previous Permit (1997 CUP)
55
56.34
56.34
Prior to construction
Current Permit (2008 CUP)
72
69.60
51.41
After construction
Source
Comment
Actual Water Usage (average rainfall)
72
55.90
10.80
Actual CUP reporting (2009 and 2010)
Estimated Water Usage (average rainfall)
72
56.14
36.73
Estimated for permitting
Project Partners
St. Johns River Water
Management District
Neighborhood
Association Group
Diocese of Orlando
City of
Orlando
FDOT
FDEP
Dubsdread
Golf Course
Thank you!