Presentation on theme: "CARY LAKE HOMEOWNERS ASSOCIATION Water Quality Issues 01-21-2014."— Presentation transcript:
CARY LAKE HOMEOWNERS ASSOCIATION Water Quality Issues 01-21-2014
Dam & spillways (2) Jackson Creek Kahn Pond Storm water discharge pipes CARY LAKE
Silt delta Roper Pond & Arcadia Edge Apartments Kahn pond Decker Blvd. New Magistrates Courts 2014 Jackson Creek Dent Middle School Trenholm Rd. New Elementary School 2014 North End Feb 2012 – Lake down Old Zorba’s Restaurant O’Neil
New Threats – RSCD2 elementary School, Magistrates Courts on Decker, Cardinal Newman School & other construction
Siltation Threats North End 1.Cardinal Newman 2.New Elementary School 2014 – 2015 3. New Magistrates Courts on Decker 2014 4. Kahn Pond 5. Six Storm water discharge pipes South end 6. Siltation Mounds from Trenholm 7. Potential for development of 12 acres
Do Private Lakes Provide a Public Benefit ? 1.Capture storm water run-off 2.Reservoir for intense rain events 3.Repository for silt, trash & pollution 4.Attract wildlife to urban areas 5.Aesthetically pleasing to residents No cost to the public purse
What is the Reservoir Effect? Control lake level to provide reservoir for capture of intense rain events. Mitigates downstream flooding If the private lakes were not there then Richland County Storm Water Department would need to provide services for capture of storm water, silt & pollution.
RESERVOIR QUESTIONS 1.Can the level of water in private lakes be managed to provide a “buffer” for intense rain events thereby mitigate downstream flooding? 2.Can individual lake owners coordinate to provide a controlled level throughout the watershed 3.Can this be achieved by suitable automatic equipment? 4.If yes, then does this enable private lakes to apply for public financial support?
North End After Dredging 2011 Creek flowing past Zorba’s and under Decker Bvd. After dredging 2011 Lake down - Full depth 5 – 5 ½ feet Silt Kahn Pond After dredging 2011 Lake down - Full depth 5 – 5 ½ feet
Depth 5ftDepth 3ft 6in Depth 4ft 6in Kahn Pond North End – Feb 2013 – Lake down After dredging 2013 Lake down - Full depth 3 ½ – 4 ½ feet
Siltation in Lake Catherine Serious silt after construction of I-77 Eventually dredged by DoT 1993 Completely re-silted by 2010 HoA spent $100,000 on consultants, lobbying Cost estimated at $980,000 Authorities policy not to dredge private lakes However, dredging now under consideration with cost share between County, City & FA
Lake Issues - Summary Sediment from land disturbances - RSD2 Elementary School Trenholm Extn./O’Neil - County Magistrates Courts on Decker - Commercial developments on Two Notch corridor - Potential for development of 12 acres at S. end Trash Pollution Sources - Jackson Creek - Decker & Trenholm - six storm-water pipes - a spillway under Trenholm
Summary continued Key question If the reservoir model works does it open the door for public funding for siltation control?
Conclusion Cary lake is under threat from sedimentation & pollution from storm water run-off CLHA needs professional advice CLHA Water Quality Committee has obtained quotes from four consulting organizations Strategy in the short term is to focus on monitoring construction activity to ensure that codes are enforced All cost $ & we are seeking grants
Water Quality Committee Chair – Alicia Myhrer Mark Huguley Peter Chesney Hal Thornton Karl Reinecke Debbie Robertson
Quotations & Actions under Review 1.Consultant review of siltation monitoring methods - Bathymetric survey entire lake +/- 1inch - Contours linked to sea level datum - Interface with dredging contractor drawings 2.Conventional survey of Kahn pond with lake down 3.Monitoring of construction discharges - 2 x private consultants - US Geological Survey Dept
Do Private Lakes Provide a Public Benefit ? 1.Capture storm water run-off 2.Reservoir for intense rain events 3.Repository for silt, trash & pollution 4.Attract wildlife to urban areas 5.Aesthetically pleasing to residents Private lakes deserve public funding support