Slide 1

Were all in this together Slide 2 The dams at Sanford, Edenville, Smallwood and Secord were built by Frank Wixom in 1925 Wixom owned all the upstream lands that were flooded The flooding created four reservoirs and lots of waterfront real estate Hydroelectric power was a relatively new industry and in its heyday in the 1920s Dams provide recreational opportunities and flood control that would not exist without them Slide 3 Slide 4 The Federal Power Act of 1920: Established government oversight over power producing dams on navigable waterways of the United States Established the Federal Power Commission to regulate them Today that agency is the Federal Energy Regulatory Commission (FERC) Slide 5 Sanford Dam was licensed in 1987 Wolverine Power Company, the former owner of the dams, disputed the federal government in court for ten more years, but in 1998 Edenville, Smallwood and Secord Dams were licensed by FERC FERCs regulations require the dams owner to perform frequent engineering studies, monitoring, environmental and emergency management Slide 6 The Probable Maximum Flood (PMF) is an event calculated by FERC to occur once every 10,000 years By comparison, the flood of September, 1986 was a 100-year flood event The FERC requires all high hazard dams to be able to safely pass the 10,000-year flood without failing (overtopping) FERC considers Edenville to be a high hazard dam because its failure would likely result in loss of life and property at Sanford Lake and downstream Slide 7 Six spillways will be reconstructed to double their capacity to pass flood water There are 3 spillways at the Tobacco River side of the dam and 3 spillways adjacent to the Edenville powerhouse on the Tittabawassee River side The total capacity of the six spillways is currently 32,000 cubic feet per second (cfs) (or 14,400,000 gallons per minute) To comply with FERCs mandate, the capacity of the six spillways will have to be increased to 64,000 cfs (or 28,800,000 gpm) Slide 8 Current configuration of spillways Tittabawassee side adjacent to powerhouse shown; Tobacco spillway is similar Slide 9 Original construction of Tobacco spillway Slide 10 Slide 11 FERC-Mandated alteration of spillways Tittabawassee side adjacent to powerhouse shown; Tobacco spillway is similar Slide 12 Example of cofferdam construction Slide 13 Slide 14 Slide 15 Example of Cofferdam construction Slide 16 Existing spillway construction Slide 17 First concrete pour inside spillway (summer 2013) Slide 18 New concrete pier extensions (summer 2014) This work takes place in the dry behind a sheet pile cofferdam Slide 19 Stoplogs are placed between piers & rest on new concrete sills Once stoplogs are in place water levels can be returned to normal Slide 20 Construction work taking place between 2015 and 2016 More concrete is poured in the base of the spillway Existing gate and bridge are removed Slide 21 Construction work taking place between 2015 and 2016 Concrete rollaway slabs and most of upstream barrel arches are removed Slide 22 Construction work taking place between 2015 and 2016 New concrete crest is poured Slide 23 Construction work taking place between 2015 and 2016 Concrete overlay is placed over entire pier structure Slide 24 Construction work taking place between 2015 and 2016 New bridge is constructed Slide 25 Tobacco Spillway to be completed in 2016 New gate is installed and stoplogs are removed Slide 26 Existing spillway Modified spillway Slide 27 Half of the dams spillway capacity will be out of service while the cofferdam is in place To reduce the risk of dam failure in the event of a significant flood, the drawdown will take place in the drier summer months 30 years of data show that rainfall is least in July, August and September FERC requires it for dam safety Slide 28 Starting in June, 2014 Wixom Lake will be drawn down 8 feet for five months (until October) then returned to normal levels The reservoir will be maintained at normal levels during 2015 and 2016 The second draw down will start in June, 2017 for five months, then Wixom Lake will be returned to normal levels in the fall Normal water levels will be maintained thereafter Slide 29 No. The PMF spillway modification will only increase the dams ability to pass flood waters During the drawdown for the Tobacco spillway construction in the summer of 2014, production and income at the Edenville powerhouse will actually be significantly reduced The turbines are not able to run at full capacity with so little head water Slide 30 No. When the Edenville (Tittabawassee) spillway is under construction in 2017, electrical production will be shut down completely; there will be no income during this time from the Edenville dam The entire spillway and powerhouse structure will be blocked off with a cofferdam for five months A powerhouse is designed at the Tobacco spillway, but its cost is not included in the spillway alteration construction estimates this could be privately financed due to its income- production capacity Slide 31 Yes. Boyce complies with all FERC-mandated dam safety requirements The Edenville dam is well maintained and is structurally sound Crushed stone reinforcing and drainage improvements have been made to the earthen dam Drainage improvements and reinforcing are ongoing for the safety and longevity of the dam Slide 32 Boyce Hydro Power has negotiated with FERC for more than seven years to reduce the PMF requirement Engineers succeeded in reducing the requirement, but FERC will not eliminate it There is no Federal funding or grant money available to Boyce to pay for the PMF alterations Boyces income from the operation of the dam doesnt come close to paying for the FERC mandates Slide 33 Net income after expenses from the operation of the Edenville dam is less than $200,000 per year The rates being paid to Boyce by Consumers Energy for energy production have not increased in the last seven years There is continued downward pressure on rates, despite increases in energy prices to end users The cost of operations continues to rise, i.e. materials, gasoline and diesel fuel, and employee benefits such as health insurance Slide 34 The cost of this federally-mandated spillway modification project is currently estimated to exceed $8 million Boyce does not have the capital to support such a massive expense Private financing is unavailable Current income is not enough and the PMF alteration does not increase income Grants are also unavailable at this time The State provides some grant money to remove or repair smaller dams, but not to comply with Federal mandates Slide 35 We all want the same thing: the guaranteed future of Edenville dam and Wixom Lake Boyce, waterfront residents, and other businesses depend on the reservoir Public financing is one alternative to pursue Lets work together to find a solution to this looming problem Slide 36 Strive to obtain and distribute accurate information Get involved with local task forces that have been established to work with our elected representatives We will overcome these issues and ensure the future of Wixom Lake for generations to come by working together