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LADWP's Crossed Arches Pipe Bridge Los Angeles Regional Chapter IN THIS ISSUE Newsletter President’s Column Page 2 VOLUME 4, ISSUE 1 MARCH 2013 RMC Consultant Profile Page 3 WateReuse 2013: L.A. Chapter Meet-Up in Monterey! Ask the Guru: A Reader WateReuse California hosts its 2013 Annual Con- ference on March 17-19 at the Portola Hotel & Spa in Recap Monterey. Page 4 The conference is designed for individuals, organiza- tions, and agencies associated with or interested in the 2013 Conference Tours and design, management, operation, and use of water recy- Workshops cling and desalination facilities and projects in California. Page 4 Topics include recycled water planning, operational issues, regulatory issues, financial considerations, and environmental benefits. Please join your fellow LA Chapter members for a NEXT MEETING special post-dinner cocktail hour Monday starting at 10 p.m. in Jack’s Lounge at the Portola Hotel to dis- Tuesday, April 9 cuss conference highlights. Also, check the Tours and 11:30am Workshops available on page 4 of this newsletter. LADWP Donald C. Tillman For more information on the conference please Water Reclamation Plant visit: https://www.watereuse.org/conferences/ california/13 6100 Woodley Avenue Van Nuys, CA 91406 LADWP’s Crossed Arches Pipe Bridge A unique pipe bridge was crossed arches to support the possible. recently built across the Tujunga pedestrian deck. • Minimal surcharge to the Channel to supply recycled The United States Army channel walls from the water to the Hansen Dam Corps of Engineers (USACE) bridge footings. Municipal Golf Course in the and the Los Angeles County • Shortest possible construc- Lake View Terrace area of Los Flood Control Districts (LACF- tion duration. Angeles. The bridge is part of CD) regulate work within the • Twelve foot minimum the Hansen Dam Golf Course Tujunga Channel right-of-way. vertical clearance to the Water Recycling Project of the These agencies required the channel. Los Angeles Department of following: The use of arches also Water and Power (LADWP). • Easement for the pipe and allowed the design of drilled Bridge designer William W. Lai, bridge to be as narrow as Continued on page 2 . PE, came up with the novel concept of crossed arches after wrestling with the problem of View of the completed crossed how to provide resistance to arches pipe bridge. lateral loads, including seismic. Instead of inserting braces between the arches, crossing the arches resulted in an efficient way to resist lateral forces. Until recently the authors were unaware of other examples of bridges with crossed arches. The December 2012 issue of Structure magazine features the award-winning Tempe (Arizona) Town Lake Pedestrian Bridge, designed by T.Y. Lin Internation- al, which prominently utilizes PAGE 2 President’s Column 2012 was a very active year for local supplies issues. Judi Miller, Robinson and our previous Chap- the Los Angeles Chapter. John our Secretary/Treasurer, has done a ter Presidents. I look to expanding Robinson led us to become one thankless job keeping the Chap- our involvement in developing state of the larger chapters ter records and expanding access wide recycled water policy and through continued edu- through our website (http://www. legislation, educating the public and cation and outreach. We watereuse.org/sections/california/ facilitating funding of local projects. now regularly have about losangeles). Monica Gasca, our I plan to work closely with Chapter 50 members from various Chapter Trustee, has been vital in Officers to try and provide addi- water agencies, engineer- keeping us informed of WateReuse tional value to the members. ing firms, and regulatory California’s Board of Directors Please feel free to contact me agencies sharing infor- activities and direction. I would also if you would like to become more mation at our meetings. like to thank Matt Elsner, Shelah involved in the Chapter or have I welcome the election Riggs, Mark Forster, the “Guru” suggestions for future meetings. of Kraig Erickson as the Earle Hartling, and all the others new Vice President and that contribute to producing the Raymond Jay look forward to working closely Chapter newsletter. with him on evaluating expansion In 2013, I hope to build on the of stormwater capture and other solid foundation established by John LADWP’s Crossed Arches Pipe Bridge Continued from page 1. pier foundations that fit within the to join the buried duc- narrow right-of-way available. The tile iron pipeline.) The decision to use pipe for the arches completely assembled was a result of the desire to use bridge was hoisted into stainless steel for long service life. place across the Tujunga The number of structural shapes Channel with a mobile available in stainless steel is limited, crane. No equipment but pipe is readily available. Yousef entered the channel, A. Gobran, PE, designed four as required by the Los reinforced concrete drilled pier Angeles Regional Water Upstream and downstream views foundations. Jianping Hu, Ph.D., Quality Control Board. of the Tujunga channel, from the PE, GE, provided a finite element The Hansen Dam spillgates of the Hansen Dam at the method soil stress analysis to the Golf Course Recycled source, to the bridge and in the back- USACE demonstrating that forces Water Project includes ground, Valley Generating Station, site transmitted to the walls of the Tu- a pumping station, of the recycled water Hansen Tank junga Channel from the piers were about 4,500 feet of 20- within acceptable limits. inch nominal diameter and pumping station. Fabrication ductile iron pipeline, was by the and the pipe bridge. LADWP’s A one-million gallon Structural hill-top tank is planned Steel Shop for the future. Con- under the di- struction of the ductile rection of Stan iron pipeline began in Brown, now September 2012 by retired. The LADWP’s Water Dis- pipe arches tribution Division. The were rolled to pipeline was designed a radius of 86 by Salman A. Sufi, PE; he also coor- pumps, each rated at 1300 gallon feet by Marine dinated the right-of-way effort. The per minute. Initially the project Temporary plates, Valve and Supply Co. of Whittier, recycled water originates at the will deliver about 500 acre-feet per braces, and supports CA. Tillman Water Reclamation Plant year of recycled water for irriga- help to fit up the LADWP’s Integrated Support in Van Nuys, CA. The pumping tion of the golf course. However, Services Division (ISS) built the station will take suction from the the pipeline and pumping station mid-span weld of foundations, erected the bridge, 7-million gallon Hansen Tank at the were sized anticipating additional the crossed arches and installed the recycled water LADWP’s Valley Generating Station customers. pipe bridge. pipe and thrust blocks. (Concrete in Sun Valley, CA. David R. Rice, Article by Wayne A. Bamossy, PE; Jen- thrust blocks are provided at each PE, was the pumping station design nifer A. Barrick, PE; and William W. Lai, end of the welded steel water pipe manager. The outdoor station will PE are with the Los Angeles Depart- where it bends down 45 degrees include three vertical turbine ment of Water and Power. PAGE 3 Consultant Spotlight: RMC Water and Environment sibility of recycled water service surges and poor water quality; to both industrial and irrigation and identifying multiple regional customers, obtained customer opportunities. RMC investigat- agreements, developed neces- ed possibilities for expanding sary reports, and construction recycled water use and reducing assistance. RMC is developing LA’s need for imported water. the Engineering Report for use of RO recycled water at NRG-El REDUCING THE NEED FOR Segundo IMPORTED WATER RMC conducted an alterna- A LONG-STANDING tives analysis to develop projects RECYCLED WATER to offset the need for imported PROGRAM FOR PASADENA replenishment water used in the RMC is providing engineering Central and Main San Gabriel services to support the design Basins. We developed alter- of Pasadena Water and Power’s natives that provided a more recycled water project. RMC reliable source of replenishment RMC Water and Environment evaluated the potential for year- water for the groundwater is a California-based environ- RMC has been working with round water reuse and season- basins for Water Replenishment mental engineering company West Basin MWD since the ally available recycled water in District (WRD) of Southern focused exclusively on water. 1990’s. The company worked order to utilize existing ground- California for their Groundwa- Included on ENR’s list of 2012 closely with the District water extraction assets. Key ter Reliability Improvement Pro- Top 500 Design Firms and Top recycled water customers will gram (GRIP). RMC conducted to market the recycled 200 Environmental Firms, RMC include Art Center College of analysis of recycled water supply water and retrofit customers, works with public agencies and Design, Brookside Golf Course, options, conducted analysis of including expansion of the local communities to develop in- Rose Bowl, and City Parks. recycled water facility options, Carson Plant to serve the novative solutions for managing participated in outreach efforts neighboring refineries. one of the earth’s most vital re- CUTTING EDGE RECYCLED with key stakeholders, and sources. With eight offices and WATER PLANNING procured funding from SWRCB 112 employees throughout Cal- RMC completed a compre- Water Recycling Facilities Plan- ifornia - in Irvine, Santa Monica, hensive recycled water planning ning Program. RMC’s work with Los Angeles, San Diego, Walnut efforts to expand Los Angeles’s GRIP will increase groundwater Creek, San Jose, San Francisco, recycled water systems to recharge in the San Gabriel and Sacramento – RMC has a meet the City’s target of 59,000 Basins strong focus on water recycling. AFY by 2035, with 30,000 AFY for indirect potable reuse via RECYCLED WATER ACROSS WATER RECYCLING IS OUR groundwater recharge and THE STATE BUSINESS CORNERSTONE 10,000 AFY of new non-pota- In the Central Valley, RMC is RMC’s principals include ble uses.
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