Howard Hanson Dam Update

Howard Hanson Dam Update

Howard Hanson Dam Update Seattle District U.S. Army Corps of Engineers US Army Corps of Engineers BUILDING STRONG® Howard Hanson Dam Green River Landslide Debris Existing Grout Small Depression Drainage Curtain Location Tunnel Spillway Big Depression Location Sand and Gravel Blanket Flood Control Eagle Gorge Tower Reservoir Fish Passage Facility Excavation BUILDING STRONG® Normal Project Operations NOV MAR JUN NOV 1206 ft Potential flood pools of Spring ramp-up for Summer and fall flow short duration augmentation augmentation 1167 ft 1075 ft Pool elevation in feet above sea level BUILDING STRONG® Grout Curtain Construction BUILDING STRONG® Grout Curtain Construction Landslide Materials Grouting Operations • Boulders • Drill casing • Primary Grout • Secondary Grout • Ancient Silt layer Bedrock Lower Aquifer BUILDING STRONG® Drainage Tunnel Improvement Construction BUILDING STRONG® Green River Valley . Blue and Purple shading is the FEMA mapped floodplain. BUILDING STRONG® As of 20FEB09 US Army Corps Of Engineers Green River Levees Seattle District ID Levee Name Eligible 20 1 Tukwila, (Federal & Certified) X 2 Desimone-Briscoe School Working 19 3 Boeing X 4 Lower Russell Working 5 Upper Russell Working 18 6 Kent Shops - Narita X 7 Meyers Golf X 17 8 County Road 8 Working 9 Horseshoe Bend (Federal) X 10 Monk (abandoned) 16 11 Reddington X 15 12 Galli’s X 13 Dykstra X 14 Fenster 13 14 15 Muellen 16 Potter 11 12 17 Neeley 18 Hammakami 19 Turley 10 9 20 Loans 21 Imhoff (Not Shown) 8 1 2 7 6 Eligible 3 4 5 BUILDING STRONGIneligible® Tukwila Temporary Measures . Raise low areas using Hesco systems and supersacks to provide 13,900 cfs capacity. Add a cut off levee . Add 3’ of freeboard to levee. BUILDING STRONG® Kent Temporary Measures . Raise low areas using Supersacks to provide 3,900 cfs containment. Secondary Containment off of levees . Add 3’ Freeboard to right bank levees BUILDING STRONG® Kent South BUILDING STRONG® Kent North BUILDING STRONG® Auburn Temporary Measures •Raise low areas on the Dykstra levee to provide 13,900 cfs capacity. •Secondary Containment using Hesco Systems to extend the Reddington Levee. BUILDING STRONG® Green River Temporary Measures Locations Deliveries Hesco Super Sacks Sandbags Auburn 10,500 100,000 Kent 21,000 500,000 Renton 11,000 250,000 Tukwila 10,500 9,000 100,000 King County 6,500 100,000 Seattle District 34,000 1,250,000 Totals 27,500 75,000 2,300,000 BUILDING STRONG®.

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