Civil Engineer USACE, Omaha District. 28 February 2017 FLOOD FIGHTING AND SURVEILLANCE
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1 217 FLOOD FIGHTING AND SURVEILLANCE Don Moses, 237 P.E Civil Engineer USACE, Omaha District February The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation. 1
2 AGENDA LEVEE DESIGN COMMON FAILURE MODES SURVEILLANCE/INSPECTION FLOOD FIGHTING EQUIPMENT 2
3 LEVEE DESIGN ISSUES Slope Stability Thru Seepage Underseepage Critical Exit Gradient Berm Weight Overtopping Resistance Streambank Erosion Protection 3
4 LEVEE COMPONENTS Riverside Natural Blanket Riverside Riprap Protection Riverside Impervious Face and Cutoff Random Fill Core Landside Seepage Control Berm Topsoil and Vegetative Cover Landside Toe Drain and Relief Wells 4
5 UNDERSEEPAGE CONTROL RELIEF WELLS 5
6 FAILURE MODES Overtopping Through Seepage/Piping Underseepage/Piping Slope Failure Riverside Erosion 6
7 OVERTOPPING AT ACCESS RAMP (JUNE 17, 2011) Low spots created by traffic Common to all levees Low spots created by levee foundation settlement Sand levee can not resist overtopping Clay levees are more resistant to overtopping but will eventually fail with sustained overtopping 7
8 L550 NORTH OF HWY 136 8
9 CONTRIBUTING FACTORS FOR THROUGH SEEPAGE Lack of Clay Riverside Face on a Sand Levee Animal Holes Undocumented non engineered levee penetrations Culvert Separations Culvert Pervious Bedding Exposed to River 9
10 10 THROUGH SEEPAGE/PIPING Water Side Levee Land Side Water exiting on levee slope Burrows Animal Burrows - Beavers and Badgers Rodent Hole Rodent Caught in the Act
11 FAILURE MODE THROUGH SEEPAGE/PIPING Drainage structures and other changes or transition areas (e.g., levee to floodwall) are potential weak points 11
12 FAILURE MODE THROUGH SEEPAGE/PIPING
13 CONTRIBUTING FACTORS FOR UNDER SEEPAGE Geological cross section Remnant River Meanders Lack of Riverside Natural Impervious Blanket Lack of Landside Natural Impervious Blanket (Thickness) Damaged blanket from erosion or manmade excavation Animal holes Encroachments non engineered levee penetrations Encroachments landside ditch excavations Encroachments landside or riverside quarry excavations Inefficient relief wells and toe drains Historic levee loading Riverside erosion 13
14 UNDERSEEPAGE/PIPING Water Flow Pipe Development (Movement of Material) Sand Boils with movement of material 14
15 HIGHWAY 2 (JUNE 17, 2011)
16 HIGHWAY 2
17 HIGHWAY 2 3 MILE SETBACK
18 HIGHWAY 2 Sand Boils
19 EROSION & LANDSIDE SANDBOILS AT RIVERSIDE RAMPS
20 SAME LOCATION - AFTER WATER RECEDED
21 FAILURE MODE SLOPE FAILURE Water Water Riverside Slope Failure *Most Common Landside Slope Failure Note stakes and flagging 21
22 FAILURE MODE SLOPE FAILURE 22
23 AREAS OF POTENTIAL EROSION Riverside levees Riverside ramps Riverside fences Historic Borrow Pits Levee Alignment Floodplain Geometry Riverside Obstruction Trees 23
24 2016 SARATOGA FLOOD FIGHT 24
25 2016 SARATOGA FLOOD FIGHT 25
26 SURVEILLANCE/INSPECTIONS 26
27 FLOOD SURVEILLANCE TEAMS Partnered for safety and efficiency Report to EOC Participate in pre and post day hand off meetings What is the current & forecasted flood situation? Project Assignments 27
28 SURVEILLANCE REFERENCES Drive the levee with the project sponsor Operations and Maintenance Manuals Annual Levee Inspections Periodic Inspections Project personnel Google Earth Historic and Recent Aerials 28
29 SURVEILLANCE TOOLS Cell phones Good project map Know your evacuation routes. Know your nearest hospital location. Aerial Reconnaissance (get on a helicopter early) GPS cameras Rod and level Tape 29
30 SURVEILLANCE TOOLS Lathe Markers Flagging / Spray Paint Life Jackets Safety Vests Binoculars Flash Lights Food and Water 30
31 FLOOD SURVEILLANCE/INSPECTIONS floodwall_line levee_flood_fight_point closure_structure_line pump_station_point levee_failure_point borehole_point sand_boil_point levee_crossing_point levee_centerline protected_area rehabilitation line piezometer_point cross_section_lin e levee_relief_well_point levee_station_point encroachment point gravity_drain_line 31
32 SURVEILLANCE ACTIVITIES Know failure modes and indications of distress EARLY IDENTIFICATION OF DISTRESS IS CRITICAL TO EMERGENCY RESPONSE (Repairs or Evacuations) Emergency Operating Plans/Emergency Action Plans/Emergency Preparedness Plans Communicate, Communicate, Communicate 32
33 WALK THE LEVEE CREST AND RIVERSIDE TOE Riverside Issues Levee freeboard read staff gages Erosion High Water Velocities / Turbulent Flows Crest Issues Overtopping Cracking / Slides 33
34 WALK THE LEVEE CREST AND LANDSIDE TOE Landside Sideslope Thru Seepage / Piping Rodent Holes Crack / Slides Landside Toe and Adjacent Area Sand boils / Piping Slides Relief Wells and Toes Drains 34
35 DOCUMENTATION Document conditions in the field Flagging, stakes, paint Photos, videos, daily reports & checklists Proper handoff to next inspection team and upward reporting Ask for assistance 35
36 STAFF GAGES IS THE WATER LEVEL GOING UP OR DOWN? Gage 1 - Just Downstream of Highway 1 Bridge Date Time Reading 1-Apr 8: Water Level 1-Apr 12: Apr 16: Apr 20: Apr 0: Increasing 2-Apr 4: Apr 8: Apr 12: Apr 16: Apr 20: is at a gage reading of 85.7 Top of water at this location Decreasing 36
37 L-601 MISSOURI RIVER ELEVATIONS Segment 1, June 19 37
38 MOBILE INFORMATION COLLECTION APPLICATION (MICA) FLOOD SURVEILLANCE FOR USACE USE ONLY 38
39 MICA - GPS CELL PHONE FLOOD SURVEILLANCE 39
40 FLOOD SURVEILLANCE/INSPECTIONS Underseepage-Boils (Landside toe area primarily) Flowing clear or moving material? 40
41 FLOOD SURVEILLANCE/INSPECTIONS Slope Instability Cracking (Levee Crest Primarily) 41
42 FLOOD SURVEILLANCE/INSPECTIONS Embankment Erosion 42
43 FLOOD SURVEILLANCE/INSPECTIONS DRAINAGE STRUCTURE, SEWERS, & OTHER PENETRATIONS 43
44 FLOOD SURVEILLANCE/INSPECTIONS DRAINAGE STRUCTURE, SEWERS, & OTHER PENETRATIONS Emergency closure of culvert Close on the riverside Close early as the river rises Safety is critical Landside closures pressurize the culvert
45 FLOOD SURVEILLANCE/INSPECTIONS CLOSURE STRUCTURES When do you erect the closure? How long will it take? Is it functioning properly? 45
46 FLOOD SURVEILLANCE/INSPECTIONS RELIEF WELLS Are they functioning? Irrigation Well 46
47 217 FLOOD FIGHTING EQUIPMENT Ryan Buckley Readiness Branch USACE, Omaha District February The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation. 47
48 FLOOD FIGHTING WHAT IS THE NEED AND WHAT ARE MY OPTIONS? Need Sand Boils/Seepage Closure Structures Levee Raise New levee segments Options Sandbags Earthen levees Innovative flood fight products HESCO Bastions RDFW Portadam Others Things to consider: How much lead time? Placement location? Available Resources? 48
49 TIME AND PLACE Sandbags Earthen Levee HESCO Bastions Earthen Levee 52
50 SANDBAGS 50
51 SANDBAG FLOOD STRUCTURE USACE Recommendations 1V:3H (1 foot high for 3 foot width) 5 foot max (3 foot or less preferred) Typical used for low/short barrier, transitions, constricted areas, closures & around sand boils 51
52 SANDBAG FLOOD STRUCTURE Direction of Flow 52
53 SANDBAG FLOOD STRUCTURE Very labor intensive Filled sandbags must be kept from freezing prior to placement Store preferably inside and away from critters. 53
54 SANDBAG FLOOD STRUCTURE 54
55 TREATING ISOLATED BOILS Ring boils if they are moving material. Do not stop the water flow, it can cause the seepage path/boil to move. Notice Anything? 55
56 EARTHEN LEVEES Why Plastic? Notice anything? 56
57 HESCO BASTION STRUCTURE 57
58 PORTADAM STRUCTURE 58
59 TOPOTUBE 59
60 HESCO JACKBOX 60
61 BIG BAGS USA 61
62 TRAPBAG STRUCTURE 62
63 DEFENCELL 63
64 FLOODBREAK 64
65 COMBINATIONS/TRANSITIONS RDFW to Earthen Levee RDFW & Sandbags Sandbags to Earthen Levee HESCO, RDFW & Sandbags Transition Concerns? 65
66 PL THE USACE EMERGENCY MANAGEMENT AUTHORITY FLOOD FIGHT SUPPLIES Equipment & Supplies Supplemental to state, tribal, and local efforts Sandbags, Pumps, Poly & Innovative Flood Fight Products State Sends Request for supplies Reimbursement of materials used Locals responsible for providing sand, pump power supply (tractor), O&M, & manpower Sign equipment loan agreement OMAHA DISTRICT 6.81 million Sandbags throughout the District 5195 Super Sandbags 1350 LF of Portadam 12,150 LF of Hesco 2,511 Rolls of Poly 3 Sandbag filling machines 28 Trailer-mounted PTO-driven pumps 66
67 QUESTIONS? 67
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