Emergency Levees. US Army Corps of Engineers BUILDING STRONG
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1 Emergency Levees US Army Corps of Engineers
2 Typical Levee Design Levee fill material Dependent on materials at hand clay or sand Clay Fill (preferred) Impermeable Smaller levee section compared to sand fill due to impervious nature of soils Resistant to erosion May be more difficult to construct than sand levee if materials frozen Sand Fill Permeable possible seepage related problems Levee section requires flatter slopes than clay fill levee due to seepage Less resistant to erosion
3 Typical Levee Design (cont) Emergency Levee Dimensions Top Width: 8 to 10 feet Minimum required width for operation of construction equipment Side Slopes: Clay Fill: 1V on 2H to 2 ½ H both sides Sand Fill: 1V on 3H riverward 1V on 5H landward
4 Typical Levee Design (cont)
5 Emergency Levee Construction Strip foundation of levee footprint to create clean interface between levee fill material and foundation soils. Remove snow, ice, organic material (ex. topsoil, turf, etc.) Break through h frost if possible
6 Emergency Levee Construction Place fill material in 9 to 12 lifts Compact levee fill with construction equipment (ex. Dozers, dump trucks)
7 Stripping topsoil prior to placing levee fill
8 Placement of clay fill over stripped levee foundation
9 Spreading and compacting clay fill for levee
10 Placement and compaction of clay fill
11 BUILDING STRONG
12 Finished emergency clay fill levee
13 BUILDING STRONG
14 Emergency Construction Earthen Levee - Problems Foundation Preparation: stripping levee footprint Soft foundation conditions difficult to operate heavy construction equipment Frozen soil difficult to remove Trees and brush in levee footprint Structures / utilities in levee footprint
15 Emergency Construction Earthen Levee Problems (cont.) Constricted areas: site conditions may make it difficult to fit levee in the required space (structures, utilities, trees) Example: A 5 foot high clay levee requires a minimum clear base width of approximately 30 feet Settlement: Weight of levee can cause consolidation of foundation soils resulting in settlement of levee Stability: Foundation soils may not be able to support weight of levee, causing the levee to fail
16 Emergency Construction Earthen Levee Problems (cont.) Seepage: Height of water surface on riverward side of levee coupled with types of soils in the levee and foundation can cause seepage through and/or under levee. If seepage forces are high enough material can be lost from within the levee or foundation soils Interior drainage: Levees often cutoff normal drainage paths to river, which could result in interior flooding
17 Emergency Construction Earthen Levee Problems (cont.) Erosion of levees due to: High channel velocities Ice and debris flows in channel Erodable levee material (sand)
18 Emergency Construction Earthen Levee Problems (cont.) Removal of levees after flood event Costly Messy Disruption to traffic Safety issues due to construction and hauling activities
19 Emergency Construction Earthen Levee Problems (cont.) Examples
20 Levee constructed adjacent to electrical substation
21 Garage damaged during levee construction
22 Levee stability failure
23 Cracks developed on levee slope
24 Sand boil development due to seepage
25 Ring levee constructed to contain seepage on the landside of levee
26 Aerial photo showing interior drainage blocked by levee
27 Pumping interior runoff from landside of levee
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