Lake Altoona (PA) Dam Improvements - Gwin, Dobson & Foreman, Inc.
Lake Altoona (PA) Dam Improvements - Gwin, Dobson & Foreman, Inc.
Lake Altoona (PA) Dam Improvements - Gwin, Dobson & Foreman, Inc.
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<strong>Altoona</strong> Water Authority<strong>Lake</strong> <strong>Altoona</strong> <strong>Dam</strong> <strong>Improvements</strong>Prepared by:Mark Glenn, P.E., President<strong>Gwin</strong>, <strong>Dobson</strong> & <strong>Foreman</strong>, <strong>Inc</strong>.June 7, 2001
Basic Information Owner - <strong>Altoona</strong> (<strong>PA</strong>) City Authority Type - Earth <strong>Dam</strong> & Concrete Core Wall Location -Central <strong>PA</strong> (Horseshoe Curve) Purpose - Potable Water Supply Capacity - 836 Million Gallons Height - 75 feet, Crest - 1,800 feet
History Designed by C.W. Knight, Rome, NY Constructed in 1913 1978 COE Phase I Inspection Seriously Inadequate Spillway (28%PMF)
Old Intake Tower
Existing Broad Crested Weir Spillway
Existing Bypass Channel
Existing Spillway Discharge
Design Criteria PMF - 30,700 CFS (12.4 Sq. Mi.) Maintain Existing Reservoir Storage Spillway Discharge to Curvilinear BypassChannel Mitigate Effects of Supercritical Flowand Cross Wave Formation Failure of Two Upstream <strong>Dam</strong>s CannotBreach <strong>Lake</strong> <strong>Altoona</strong>
<strong>Lake</strong> <strong>Altoona</strong> <strong>Dam</strong> & Reservoir
Design Solution Floodwall (7) Used to <strong>Inc</strong>reaseSpillway Head & Reduce Spillway Widthto 132 Inflatable <strong>Dam</strong> Deflates During PMF &<strong>Inc</strong>reases Spillway Head (4) Computer Modeling Showed a SideChannel Spillway Would Avoid RapidlyVaried Flow & Cross Wave Formation Stability Analysis Favorable withModifications (Rapid Drawdown Factor
Spillway, Floodwall & Intake Tower
Ogee Weir Overflow
Side Channel Spillway and Bypass Channel
Other Features Intake Tower Surface Rehabilitation Intake Tower Addition and Building 36 Intake/60 Blowoff Relocations Bypass Channel Pressure MortarSurfacing Access Roads & Bridges Inflatable <strong>Dam</strong> and Control Building Embankment Erosion Protection andToe Drain
Intake Tower and Flood Wall
<strong>Dam</strong> Embankment Access Road
Construction Project Cost - $8,000,000 Construction Started - April, 1998 Construction Completed - August, 2000 Project Financed Through WaterRevenue Bonds and State PennvestProgram
Floodwall Construction
Overflow Ogee Section Construction
Spillway Ogee Weir Construction
Side Channel Spillway Walls & Counterforts
Approach Channel Work
Approach Channel and Left Abutment Area
Side Channel Spillway Construction
Spillway Construction
Bypass Channel Construction
Spillway Channel Construction
Bypass Channel - Pressure Mortar Surfacing
Intake Tower Pressure Mortar Surfacing
Intake Tower & Bridge
Embankment
Spillway Channel & Access Bridge
Overflow - Inflatable Rubber <strong>Dam</strong>
<strong>Lake</strong> <strong>Altoona</strong> <strong>Dam</strong> & Reservoir
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