1 P resentation for: Linville Land Harbor Dam Dam Alternatives Analyses Discussion May 11, 2007
2 Problems with the Dam • NCDENR Dam Safety Concerns – Inadequate Spillway Capacity – Condition of the Concrete - ASR – Condition of the Gates – Foundation Seepage – Erosion • Undermining • Downstream
3 Purpose • Meet requirements of DENR, Dam Safety • Evaluate the hydrology and hydraulics – Develop Spillway Design Flood – Iterations of spillway configurations – Downstream and Lakefront impacts – Selection of two spillway configurations – Cost analysis for the two options • Not duplicate previous work
4 Purpose • Other work – Assist with the Emergency Action Plan – Perform Preliminary Environmental Assessment – Perform a Bathymetric Survey of Lakebed
5 Purpose • Likely Options for Dam Alternatives may include or be a combination of: – Labyrinth Spillway Section – Overflow Spillway – Overtopping Protection – Gate for Reservoir Drawdown (Dam Safety)
6 Labyrinth Spillways
7 Spillway Outflow Calculation = ´ ´ 3 / 2 Q C L H
8 Yahoola Creek Dam, GA
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10 Whitewater Lake Dam, GA
11 Waterford Lake Dam, NC
12 • Construction – River Diversion – Earth Tie-in
13 Stilling Basin
14 Roller Compacted Concrete • What is it? • Why do you use it in dams? • What use for Land Harbor Dam? – Control Spillway Section – Overtopping Protection
15 Overflow Spillways
16 Steps for Energy Dissipation
17 Base Flow
18 Emergency Flow
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20 OVERTOPPING PROTECTION
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23 Topsoil Covered
24 Drain and Minimum Flow Release
25 Questions?
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