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CE 496 Senior Design Project

Los Angeles County Department of Public Works San Gabriel Coastal Basin Spreading Grounds Levee Seepage Analysis. CE 496 Senior Design Project. Career Awareness Day. Career Awareness Day on Friday, January 13, 2012 Register as soon as possible. Rules of the Classroom. Class Participation

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CE 496 Senior Design Project

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  1. Los Angeles County Department of Public WorksSan Gabriel Coastal Basin Spreading GroundsLevee Seepage Analysis CE 496 Senior Design Project

  2. Career Awareness Day • Career Awareness Day on Friday, January 13, 2012 • Register as soon as possible.

  3. Rules of the Classroom • Class Participation • Sign in sheet • Cheating • Food and Drink • Videos

  4. The Golden Necklace • The Golden Necklace project envisions a long distance route that connects the San Gabriel Mountains to the ocean in Long Beach, via a grand loop or “golden necklace.” • Creatsmuch needed recreation space for pedestrians, bikers and equestrians • Project provides educational opportunities to increase awareness about the watershed and importance of the region’s precious water supply. • The open space brings a welcome transit alternative in a time of skyrocketing gas prices and constant traffic jams.

  5. The Emerald Necklace

  6. The Emerald Necklace Rio Hondo River Los Angeles River San Gabriel River

  7. The Emerald Necklace

  8. The Emerald Necklace is a 17 mile loop of parks and greenways connecting 10 cities and nearly 500,000 residents along the Río Hondo and San Gabriel Rivers.

  9. The Emerald Necklace • Nestled in the heart of the San Gabriel Valley, it provides desperately needed recreational areas for communities. • It is a significant piece of the vision for an urban L.A. connected by river greenways. • The Emerald Necklace will unify more than 1,500 acres of parks and open spaces along an interconnected greenway around two major urban rivers.

  10. Emerald Necklace Accord

  11. The San Gabriel Coastal Basin Spreading Grounds facility (SGCBSG) is located in the City of Pico Rivera adjacent to the San Gabriel River and downstream of the Whittier Narrows Dam.

  12. Overview of San Gabriel Coastal Basin Spreading Grounds Operations • San Gabriel Coastal Basin Spreading Grounds consists of: • A desiltingbasin • Three spreading basins • A canal • A pump station • A number of diversion structures

  13. Water first enters the spreading grounds through the headworks and flows into the desilting basin. The desilting basin provides time for some of the solids that may be suspended in the water to settle out. San Gabriel River desilting basin spreading basin number 1 headworks Diversion Structure intake canal

  14. After passing through the desilting basin, water flows through the intake canal. From the intake canal, water can be diverted into Basin 1 through two rectangular concrete box culverts. The culverts have slide gates on the intake that can be used to regulate flow into Basin 1. concrete box culverts

  15. When the water surface elevation in the intake canal exceeds the elevation of the oblique spillway downstream of the intake to Basin 1, water will flow over the spillway and down the intake canal towards the Mines Avenue pump station and the intake to Basin 2. Intake Canal concrete box culvert and intake to basin 1 Weir

  16. From there water can either be pumped to Rio Hondo Coastal Basin Spreading Grounds or directed into Basin 2. When Basin 2 fills to its maximum water surface elevation, water flows over a spillway into Basin 3. Basin 3 is the terminal basin. Mines Avenue pump station

  17. When water is being impounded in SGCBSG Basin 1 and the desilting basin, seepage and sand boils have been observed on the toe of the adjacent west embankment of the San Gabriel River. Seepage through the embankment has the potential to lead to a piping failure, in which water seeping through the embankment begins eroding material as it flows through the embankment. spreading basin number 2 Mines Avenue pump station

  18. Hydraulic Criteriaand System Capacities • The maximum intake into the spreading grounds is 350 cubic feet per second (cfs). • The approximate percolation rate is 75 cfs.

  19. Video • A video of these facilities to familiarize you with the facility has been prepared by Professor Knur. • Let us view this video.

  20. Problem Description • LACDPW has investigated a seepage issue from the intake canal and basin 1 into the San Gabriel River • Immediately they recommended temporary restrictions on spreading grounds operations to reduce seepage. • A permanent solution to the seepage issue is necessary to restore unrestricted operation of the spreading ground and eliminate the safety hazard posed by the potential of a piping failure.

  21. Available Data • The County has provided us with the following data: • Operations Map of the spreading grounds • Operations Plan for the spreading grounds • “As-built” drawings of the spreading grounds • Topographic surveys of the spreading grounds and river • Soil boring logs for the west embankment of the San Gabriel River • LACDPW memo concerning seepage issue • Photographs • Template and example Project Concept Reports • “JOC” book of construction costs • Conduct a site visit(s) for CSULA students

  22. The County has a trove of information for us.  • It will take a little time to look through it all. • We will get started today. 

  23. FTP site • The FTP site is up and running.  • The way to get on is through "my computer" • clear the address bar and type in ftp://ce496a2012@undergroundinsight.com • when the log in page comes up make sure that the name is ce496a2012@undergroundinsight.com • The password is:studyhard! • After few seconds, you will see the folders.

  24. Task 1 – Initial Investigation • Conduct an initial investigation of the seepage issue and determine the criteria for design of a solution.

  25. Task 1 – Initial InvestigationComponents • Utilizing survey data and “as-built” drawings, teams will generate cross-sections at two locations along the levee near the beginning and end of the location where seepage was observed to have occurred as identified by LACDPW. • Utilizing soil data from the levee certification project, teams will determine the permeability of the soil within the levees.

  26. Task 1 – Initial InvestigationComponents • Utilizing “as-built” drawings, CSULA will determine the maximum water surface elevation (WSE) in the intake canal (at the location of the cross-sections) for the flow rates when • Putting the maximum flow rate into Basin 2 • Operating the pump station at its maximum flow rate

  27. Task 1 – Initial InvestigationComponents • Utilizing the Operations Plan, the generated cross sections and previous calculations, CSULA will generate flow nets at both locations for the following operating scenarios: • Basin 1 at max WSE, intake canal dry, river dry • Basin 1 at max WSE, intake canal at max WSE, river dry • Basin 1 at max WSE, intake canal at max WSE, rubber dam 3 at max WSE

  28. Task 1 – Initial InvestigationComponents • From the flow nets, teams will identify the critical scenario for design of the solution.

  29. Task 1 – Initial InvestigationDeliverables • A brief memo that contains flow nets for scenarios at both locations and identifies the critical scenario for design. • Teams should attach as references a map showing the locations where the cross sections were taken, soil permeability calculations, and hydraulic calculations. • Any other background information or calculations considered necessary may be included as attached references.

  30. Task 2 – Alternatives Evaluation • Identify no less than three potential permanent solutions to address the seepage issue. • Prior to beginning investigation of alternatives, Teams will consult with LACDPW for concurrence or guidance on additional alternatives to be investigated.

  31. Task 2 – Alternatives Evaluation • For each alternative identified: • A brief conceptual written description of the solution and how it addresses the seepage issue • Schematic drawings, including at least one plan view and cross section if applicable • A preliminary estimate of quantities of materials, cut/fill volumes, etc required for construction • A preliminary cost estimate for construction

  32. Task 3 – Project Concept Report • LACDPW will select an alternative for implementation from among the alternatives identified in Task 2. • LACDPW may make specific modifications to the selected alternative to refine the conceptual design. • Teams will then prepare the Project Concept Report for the specified alternative under the direction of LACDPW.

  33. Schedule • Site Visit –January 17th • Task 1 Deliverable Due – End of February • Task 2 Deliverable Due – End of March • Task 3 Draft PCR Due – End of April • Task 3 Draft PCR Due – End of May • Howard will now discuss the specifics of the schedule

  34. Field Trip • When: Tuesday, January 17, 8 to 10:30am • Where: 9799 Mines Ave, Pico Rivera, CA 90660. Meet inside the entrance at Mines Ave, staying off the bike path. • Parking: On Mines Ave, please carpool to minimize impact on the residents. • With this number of people, we need to be intentional to minimize our impact on the other visitors to the facility’s public bike path and the local residents … noise volume, not blocking bike paths, and staying in the vicinity of the DPW guides.

  35. Field Trip • All students must fill out and turn in to John Shamma the DPW indemnification forms. • All students must fill out and turn in to John Shamma the CSULA indemnification forms.

  36. Project Teams • Project Management (4 individuals) • Geology and Geotechnical (12 individuals) • Hydrology (12 individuals) • CADD (8 individuals) • Civil Design and Structural ( 4 individuals) • Let us now form the TEAMs

  37. The Design Process • The Design Process: • Step 1. Define the Problem • usually starts out vague and abstract, general ideas. • Step 2. Gather Pertinent Information • collect all available information pertaining to the problem. • this includes all existing data or solutions, • specifications, building codes, or any standards • also includes economic factors, social factors, ... • Step 3. Generate Multiple Solutions (Alternatives) • this is where creativity begins. • systematic application of scientific theory, and rules. • apply new ideas, tools, and methods to come up with a totally unique solution or solutions.

  38. The Design Process • The Design Process: (cont’d) • Step 4. Analyze and Select a Solution • this is where “number crunching” begins. • alternatives provides more specific problems which now must be analyzed. • analysis involves the evaluation of the proposed design(s). • technical (not creative) knowledge is applied to decide the “best” solution. • “best” solutions involves factors such as cost, safety, constructibility, etc. • sometimes mathematical or physical models are created. • Step 5. Test and Implement the Solution • generally not performed in Civil Engineering Design.

  39. Tasks for Today • Write a definition of the project as was presented today. • Start reading, reviewing, and understanding the data available to you on the FTP site • Generate ideas on how you would solve the problem. • Deliverables: a one page write-up defining the problem and proposing a few solutions. • Email the write-up to: • Jshamma@charter.net • The file mailed to me should be in the following format: • Lastname_firstname_CE496_todaysdate • Example: Shamma_John_CE496_01102012.pdf

  40. Questions ?

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