Harder Sess8 102209
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The document summarizes inspections of several levee failures that occurred during the 2008 Midwest floods. It describes distress observed at the East St. Louis levee, including sand boils, uprooted trees, and disturbed ground. It also details a breach at the Pin Oak levee system where animal burrows were found, and two breaches at the Cap au Gris levee where extensive buried tree root systems were discovered post-failure. Additionally, pre-existing issues including location, fill material, and erosion were identified as contributing factors for a breach at the Birdland levee along the Des Moines River. The conclusion emphasizes lessons on the destructive impacts of burrowing animals and hidden tree root systems within levees.
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San Elijo Hills Drainage Diversion storm drain line ‘n’ 1
A fire hydrant was knocked over, spilling over 90,000 gallons of water into a storm drain line over 21 minutes. This caused erosion and transported sediment and rocks downstream. Photos show the progression of erosion over time from the initial incident and subsequent rains, including a boulder being toppled over. The temporary fix of adding rocks to an eroded area was deemed insufficient and exposed more land to erosion.
Eops 2016 05_02
EOPS_May_2_2016,
Spring air temperatures are higher - it has been sunny and dry. The snowpack is quickly disappearing as temperatures are up to 7 °F warmer at higher elevations. Snowmelt-fed rivers are running very high. How does this affect water quality in Puget Sound? A strong spring phytoplankton bloom extends across Puget Sound and the Strait of Juan de Fuca. Water temperatures are still higher than normal and jellyfish are already numerous in southern inlets. The high biological activity is causing organic material to drift at the surface and wash onto beaches. Do you know how fast a Sand Star can move?
Ecology Publication No. 16-03-073
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More from SAME 2009 California Water Conference
Travis Tuesdaynoon 102709
The document discusses the challenges of rising sea levels for coastal areas like San Francisco Bay. It notes that sea levels have risen 0.63 feet per century locally and are projected to rise much more significantly, up to 1.8 feet by 2100, depending on emissions levels. This increased flooding would impact airports, Silicon Valley, and increase 100-year flood events to every 10 years. The document outlines California's climate change programs and policies to address and adapt to these challenges through emissions reductions, planning for sea level rise, and developing resilient infrastructure and communities. It stresses that adaptation is necessary to deal with the impacts of rising seas.
Tibbitts Sess14 102009
The 1986 flood near Sacramento revealed deficiencies in the flood control system including insufficient storage, levee seepage, stability, erosion, and height issues. Congress authorized studies and the Common Features Project to address these deficiencies. The Project included levee improvements, slurry walls, raised levees, and closure structures on the American and Sacramento Rivers. Additional work is still needed to fully strengthen the system to convey 160,000 cubic feet per second from Folsom Dam as authorized in 1999. A new study is underway to identify new deficiencies and recommend further remedial actions to reduce flood risk.
Suedel Sess5 102309[1]
The document discusses risk-informed decision making for sustainable management of flood risks. It describes using a risk analysis and decision analysis framework to evaluate alternatives and select recommended plans. Scenario analysis is used to consider future uncertainties. The document provides an example of how these techniques were applied to post-Katrina planning for coastal Louisiana, including specifying objectives, evaluating alternatives, and conducting multi-criteria decision analysis to rank plans. Adaptive management is discussed as a way to incorporate new information over time.
Stockton Wednesday8am 102809
The document discusses the US Army Corps of Engineers' approach to flood risk management. It advocates for a comprehensive, risk-informed systems approach that considers entire river basins and coastal zones. Key aspects include quantifying and communicating residual risks, fostering collaboration among stakeholders, and planning for long-term performance and resilience of flood protection systems. The Corps' actions include risk-informed decision making, communication of risk to the public, and taking a systems approach that considers interdependencies.
Stockton Wed Am 102809
The document discusses various challenges facing water resource management in the US, including population growth, aging infrastructure, environmental issues, and climate change. It outlines the US Army Corps of Engineers' shift to a more holistic, collaborative approach focused on long-term solutions through integrated water resource management, risk-informed decision making, adaptive management, and leveraging of resources.
Sorci Sess7 101309
Cutoff walls installed along levees in the Natomas Basin were constructed using either a deep soil mixing or slurry trench method. These walls create an impermeable barrier that reduces horizontal water flow through permeable soil layers. Modeling showed cutoff walls can reduce local groundwater recharge by up to 85% when penetrating a sand layer fully, with an overall basin reduction of 20-25%. Transient modeling validated steady state results, with recharge reduced by 70% at one location. Nearby canals and the cutoff wall may also cause slight local increases to summer groundwater levels.
Shewbridge Sess05 101309
This document summarizes a simplified approach to assessing levee seismic vulnerability. The approach uses the Newmark method to estimate potential deformation from earthquakes and assess post-earthquake flood protection ability. Key steps include evaluating seismic hazard, liquefaction potential, earthquake loading, and calculating displacement based on factors like magnitude, levee properties, and ground motion. Charts and examples of results are presented.
Seed Wed Am 102109
The document discusses California's levee issues and the risks to people and water supplies. Some key points include:
- The New Orleans hurricane of 2005 caused over 1,500 deaths and displaced over 400,000 people, costing $100-150 billion in losses.
- California's Central Valley Flood Control Project aims to protect over 1 million people, critical infrastructure, water supplies for 24 million people, and ecosystems but faces risks from levee failures.
- Levee failures can occur suddenly from earthquakes, erosion, overtopping, or seepage/piping. The Delta region faces a 1-2% annual risk of catastrophic damage from seismic events.
Sabol Sess3 100909
Capay Diversion Dam in Yolo County, California supplies irrigation water to 60,000 acres of farmland. The dam diverts 250,000 acre-feet of water from Cache Creek when supply is available. A 2005 inspection found partial failure of the dam's apron, local scour, and sediment abrasion damaging the concrete over time. Conditions around dams change with urbanization, farming, and vegetation growth requiring periodic inspections and testing to assess aging infrastructure and ensure structural integrity.
Riley Sess3 101309
Hidden Dam in Madera County, California has been identified as needing safety modifications due to deficiencies found during risk assessments. It has been given a Dam Safety Action Classification of II, indicating issues that could develop into critical safety problems if not addressed. Ongoing studies are analyzing foundation seepage, the potential for spillway erosion during extreme flood events, and the seismic adequacy of the intake tower. The next steps will be to complete modification studies, evaluate remediation alternatives, and develop recommendations in a formal report to address the identified safety risks at Hidden Dam.
Ragain Sess1 102209
LiDAR technology was used to survey over 90,000 acres of the Lower Klamath and Tule Lake National Wildlife Refuges to support water resource management. The high-accuracy LiDAR data provided detailed digital elevation models, contours, and orthophotos that documented current infrastructure and habitat conditions. This data allows water management alternatives to be thoroughly analyzed by facilitating calculations of areas, volumes, water storage capacities, and potential water reuse capabilities. The comprehensive survey results provide wildlife managers with long-term tools to identify and implement improvements that optimize the efficient use and storage of available water resources.
Mullins Sess8 101509
The document summarizes the geotechnical and design challenges in rebuilding the levees in New Orleans after Hurricane Katrina, including conducting over 350 miles of borings and tests, implementing GIS systems to manage the large amount of data, and emphasizing safety, communication, logistics, and a systems approach. Key lessons learned included the importance of safety planning, open communication, treating the process as a system to enhance productivity while ensuring quality, and verifying conditions rather than assuming them.
Mc Knight Sess13 102309
The document summarizes the construction methods used for the East Duden Property portion of the Napa River Flood Protection Project. Key aspects included excavating 96,000 cubic yards of contaminated material from the marshplain and floodplain, installing 2,300 feet of turbidity curtain, constructing 1,450 feet of new levee and repairing 1,800 feet of existing levees. 20,000 tons of contaminated materials were removed to a Class II landfill. The marshplain was excavated to an elevation of 0.0 feet and the floodplain was terraced. 60,000 cubic yards of material was screened to remove debris and 25,000 cubic yards of concrete was crushed.
Millet Sess5 102709
The document summarizes the Erosion Screening Process (ESP) used to assess erosion risks for urban levees in California. The ESP involves a three tiered analysis: 1) evaluating levee geometry, 2) analyzing wind fetch, flow velocity and erosion surfaces, and 3) using a spreadsheet to qualitatively assess erosion risk based on the other tests. Field investigations are also conducted. The ESP aims to identify erosion risks using limited investigation and testing in a scientifically sound manner. Results will be presented in Geotechnical Engineering Reports to help guide levee remediation efforts.
Mc Quirk Sess1 101509
This document discusses planning for the South Delta Improvement Program (SDIP) in California. SDIP aims to reduce juvenile salmon movement into the south Delta and maintain water supplies and quality for agriculture. However, the program has faced many challenges over its history from 1982 to present due to changing environmental regulations, endangered species protections, and scientific understanding. Ongoing modeling, design modifications, and interim actions aim to balance water delivery and environmental goals in this complex system.
Martin Sess13 101309
The document discusses partnering for the Folsom Dam Phase II project in California. It describes some of the challenges of the project including tight timelines, water levels, and traffic restrictions. Partnering activities included dewatering an area with divers, getting project teams to know each other through workshops, and follow through with regular evaluation meetings. Key elements of successful partnering included commitment, communication, and empowering stakeholders to resolve issues. Partnering created a cooperative team and formula for project success.
Marks Sess13 102309
The document summarizes a project to modify Dike 5 at Folsom Lake through partial removal of the downstream face and construction of new sand and gravel drains to control internal erosion. Key aspects of the project included excavating 40,000 cubic yards of the existing downstream face, installing 1,500 feet of 15-inch toe drain pipe, and placing 18,000 cubic yards of fine sand filter and 2,500 cubic yards of coarse gravel filter. The work was performed between September 2008 and February 2009 using conventional earthmoving equipment as well as a specialized material delivery system to precisely place construction materials.
Mark Cowin Same 10282009
This document provides an overview of FloodSAFE, California's initiative to improve integrated flood management through a system-wide approach. Key points include:
- FloodSAFE aims to reduce flood risks through regional projects, improving basic flood management, and developing a system-wide approach.
- The initiative focuses on enhancement of sustainable resources, integration of multi-purpose projects, and safe communities for sustainable economic growth.
- Achievements include critical levee repairs, sediment removal, floodplain mapping, and securing bond funding for projects.
- Upcoming projects over the next two years include levee repairs, sediment removal, continuing work on the American River Common Features project, and additional early implementation projects.
Magness Sess12 102609
The document summarizes the responsibilities and activities of the US Army Corps of Engineers Los Angeles District. It oversees water resources projects in southern California and parts of surrounding states, including flood risk management, ecosystem restoration, navigation, and regulatory permitting. It also provides support to numerous military installations and has a large civil works, military, and interagency support program budget.
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Harder Sess8 102209
- 1. Inspection of Levee Distress and Breaches During the Spring 2008 Midwest Flood Presenter: Leslie F. Harder, Jr., PhD, PE, GE
- 8. East St. Louis Levee Distress
- 9. East St. Louis Levee Distress Relief Well
- 10. East St. Louis Levee Distress Disturbed Ground
- 11. East St. Louis Levee Distress Uprooted Trees and Root Balls Uprooted Trees and Root Balls Uprooted Trees and Root Balls Disturbed Ground – Broken Roots
- 12. East St. Louis Levee Distress
- 13. East St. Louis Levee Distress Sand Boils, Rings Disturbed Ground
- 14. East St. Louis Levee Distress
- 16. Pin Oak Levee Distress and Breach
- 17. Pin Oak Levee Distress and Breach
- 18. Pin Oak Levee Distress and Breach
- 19. Pin Oak Levee Distress and Breach
- 20. Pin Oak Levee Distress and Breach
- 21. Pin Oak Levee Distress and Breach
- 22. Pin Oak Levee Distress and Breach
- 23. Pin Oak Levee Distress and Breach Constructing Emergency Flood Wall Using Hesco Baskets
- 24. Pin Oak Levee Distress and Breach
- 25. Pin Oak Levee Distress and Breach
- 26. Pin Oak Levee Distress and Breach
- 27. Pin Oak Levee Distress and Breach
- 28. Pin Oak Levee Distress and Breach
- 29. Pin Oak Levee Distress and Breach Stacked Hesco Baskets Used in New Orleans During Hurricane Gustav
- 30. Pin Oak Levee Distress and Breach
- 31. Pin Oak Levee Distress and Breach Animal Burrows Observed in Breach Section
- 33. Cap au Gris Levee Breaches
- 34. Cap au Gris Levee Breaches – Site 1
- 35. Cap au Gris Levee Breaches – Site 1
- 36. Cap au Gris Levee Breaches – Site 1
- 37. Cap au Gris Levee Breaches – Site 2
- 38. Cap au Gris Levee Breaches – Site 2
- 39. Cap au Gris Levee Breaches – Site 2
- 40. Cap au Gris Levee Breaches – Site 2
- 41. Cap au Gris Levee Breaches – Site 2
- 42. Cap au Gris Levee Breaches – Site 2
- 43. Cap au Gris Levee Breaches – Site 2
- 44. Cap au Gris Levee Breaches – Site 2
- 45. Cap au Gris Levee Breaches – Site 2
- 46. Cap au Gris Levee Breaches – Site 2
- 47. Cap au Gris Levee Breaches – Site 2 Tree roots extending up and obliquely toward River Burned tree stump at landside toe
- 48. Cap au Gris Levee Breaches – Site 2
- 49. Cap au Gris Levee Breaches – Site 2
- 51. Birdland Levee Distress and Breach (Des Moines, IA)
- 53. Birdland Levee Distress and Breach Area of 2008 Breach
- 54. Birdland Levee Distress and Breach
- 55. Birdland Levee Distress and Breach
- 56. Birdland Levee Distress and Breach Repaired Breach Section
- 58. Lessons Can Be Learned