CE 496 Senior Design

1. CE 496 Senior Design Project Status Lecture 7 Date: 1/31/2012 Professor Knur

2. Project Status

3. Project Status Task 1 – Initial Investigation • CSULA will attend the site visit with members of LACDPW staff.

4. Project Status Task 1 – Initial Investigation • Utilizing survey data and “as-built” drawings, CSULA 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 in the LACDPW memo.

5. Project Status Task 1 – Initial Investigation • 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 .

6. Project Status Task 1 – Initial Investigation • 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

7. Project Status

8. Project Status

9. Project Status Task 1 – Initial Investigation • From the flow nets, CSULA will identify the critical scenario for design of the solution.

10. Project Status Task 1 – Initial Investigation Critical Scenario determined by • Underseepage per foot of levee q = k* (nf/nd)* H Where: q = flow per foot of levee k = coeff of perm. nf = number of flow paths nd = number of equipotential drops H = elevation difference between WSE

11. Project Status Task 1 – Initial Investigation Critical Scenario determined by: Boiling (with FS = 2) Ic = (Yt –Yw)/YwWhere: Ic = Hydraulic gradient (critical) Yt = total unit weight of soil Yw = Unit weight of water Fs = ic/i = 2 Where i = actual hydraulic gradient

12. Project Status Task 1 – Initial Investigation • Deliverable: A brief memo that contains flow nets for scenarios a-c at both locations and identifies the critical scenario for design. CSULA 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 by CSULA may be included as attached references.

13. Project Status • Status of XS • Status of lab data • Analysis of lab data • Identify Fill/Natural contact in borings (both Co. and CSULA), water depths • Compare Field DD to Lab Maximum • Verify lab data and Boring logs coincide • Select “representative properties • Begin Flow Nets

14. Flow Nets • Revisit Lecture 3 by Prof. Shamma • File: “flow net basics” on FTP site • File: NAVFAC DM7.01 CH6 on FTP • File: Seepage and Flow Nets Ch 4

15. Flow Nets • After nets are complete • 2 locations • Calculate completeRevisit Lecture 3 by Prof. Shamma • File: “flow net basics” on FTP site • File: NAVFAC DM7.01 CH6 on FTP • File: Seepage and Flow Nets Ch 4