los alamitos creek flood study - cdn.ymaws.com · los alamitos creek flood study fma conference...
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![Page 1: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/1.jpg)
Los Alamitos Creek Flood StudyFMA Conference Presentation
September 09, 2015
Gabriel Vallin
![Page 2: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/2.jpg)
![Page 3: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/3.jpg)
Presentation
• Study Description
• Study Limits
• Approach
• Current Work Status
• Next Steps
• Levee Analysis – Structural and Hydraulic
• Floodplain Evaluation
• Mapping
![Page 4: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/4.jpg)
Study Description
• 1980 Levees – Outdated Hydrology/Hydraulics
• FEMA Standards updated – more Freeboard
• Levees no longer provide 100 year protection with updated FEMA guidelines
• Current Flooding - Zone AE
• Updating – Hydrology, Hydraulics, Geotech, Remapping
• Possible Benefits – Remove parcels from Floodplain, accurate mapping of flood risk, real time flood warning system, technical basis for future flood protection
![Page 5: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/5.jpg)
Study Limits
![Page 6: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/6.jpg)
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Mapping Approach
Field Survey Channel Geometry
Overflows
Channel Capacity
HEC-RAS(S&US)
HEC-RAS 2D(Floodplain)
2006 LiDAR(LAS to adf)
Floodplain Mapping
Hydrographs (100yr)Hydrologic Study
![Page 7: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/7.jpg)
Current Work Completed and In Progress
• Updated Hydrology
• Steady and Unsteady HEC-RAS Models
• Freeboard Analysis – Deficient in most areas
• Levee’s Non-accredited
• Channel Capacity Evaluation
• Geotechnical Analysis
![Page 8: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/8.jpg)
Next Steps
• Levee Analysis– Structural– Hydraulic
• Floodplain Evaluation
• Remapping
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LAMP – Levee Analysis and Mapping Procedures
• Non-Accredited Levees
• Previous – Without Levee Approach
• Multiple Reaches
• Sound Reach
• Freeboard Deficient
• Overtopping
• Structural Inundation
• Natural Valley
![Page 10: Los Alamitos Creek Flood Study - cdn.ymaws.com · Los Alamitos Creek Flood Study FMA Conference Presentation. September 09, 2015. Gabriel Vallin](https://reader036.vdocuments.mx/reader036/viewer/2022070920/5fb8fc9021587b22085d3eda/html5/thumbnails/10.jpg)
Levee – Freeboard Deficient
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Levee – Structural
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FloodplainEvaluation
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This is the End…any questions?
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