Environmental & Water Resources Institute (EWRI)

Related News Archive: 2015

Natural Valley Procedure for Hydraulic Analysis and Floodplain Mapping of Non-Accredited Levee Systems Using HEC-RAS 2-D

By: Roger Chung, PE In the August luncheon, Dr. Dragi Stefanovic of Tetra Tech, Inc., presented a new procedure for hydraulic analysis and floodplain mapping of “Without Levee” (Natural Valley) conditions in accordance with latest FEMA guidelines for Analysis and Mapping of Non-Accredited Levee Systems. An unsteady hydraulic model (HEC-RAS) is developed to analyze flows in the main river, while two-dimensional flood routing (HEC-RAS 2-D) is utilized for the floodplain mapping on the landward side of a levee. The advantages and challenges of the new approach are discussed with special emphasis on the long awaited HEC-RAS Version 5.0 featuring a two-dimensional modeling component. More »

Climate Change on Flood Damages

By: Roger Chung, PE, QSD, QSP On October 8th, Professor Brett F. Sanders, Ph.D., Department of Civil and Environmental Engineering, University of California, Irvine gave a presentation on Communicating Coastal Flooding Risk with Street-Level Data. More »

Update on the Irvine Ranch Water District Membrane Bioreactor Project

By: Ankita Vyas, EIT On December 3rd Steve Malloy, Principal Engineer with Irvine Ranch Water District (IRWD) for over 25 years, gave a presentation to the EWRI Orange County on the Michelson Water Recycling Plant (MWRP) Phase 2 Expansion. More »

Environmental Water Resources Institute (EWRI) Presented a Continuing Education Seminar - Engineering Analysis for Urban Drainage Systems

By: Nick Zamarripa The September  ASCE/OC EWRI Contiuing Education half-day seminar on Engineering Analysis for Urban Drainage Systems provided a wealth of knowledge and practical advice from the presenters. More »

A Continuation: Recollections of Orange County’s Ebb and Flow of Infrastructure Development

By: Carl Nelson, PE (ret) A recent OC Register headline inspired ASCE OC Life Member, Carl Nelson, PE to share his personal thoughts about infrastructure development in Orange County. More »

Water District Panel (MWDOC, OCWD, SMWD, and MNWD)

By: Jenny Robinet/Jose Cruz, MS, PE As a result of the current drought in California, state law makers took action this past July and issued mandatory water cuts to water suppliers throughout the state to help alleviate water supply concerns and mitigate the impact of the drought.  By February 2016, water districts and suppliers throughout the state are required to reduce their water use by a specified percentage.  The required reduction percentage varies per district/supplier, but the overall average cut is 25%.  More »

A Storm Drain Success Story: Two Tunnels & a Landslide

By: Bita Sadri, P.E. At the Orange County Branch Environmental and Water Resources Institute (OC EWRI) June Luncheon, Mr. Randal Berry, P.E. Design Manager of Harris & Associates, Irvine, CA presented on the 2014 American Public Works Association award winning Project, San Ramon Canyon Storm Drain in Rancho Palos Verdes. More »

Environmental Panel Discussion

By: Joe Gonzalez, P.E. ASCE Orange County held its June lunch event at the Center Club in Costa Mesa.  We had a great panel of that included a permit manage and environmental planners representing Orange County Public Works, Orange County Transportation Authority (OCTA), and Transportation Corridor Agencies (TCA). The topics presented were related to permitting, environmental mitigation, and environmental restoration. More »

Orange County Water District Groundwater Replenishment System – New Options to an Old Problem

Read about the Thursday, April 2, 2015 tour of the new OCWD water purification facility the attendees of the Orange County Environmental and Water Resources Institute (OC EWRI) Technical Luncheon participated in. More »

Agency to Agency Flood Risk Mentoring Session

The National Association of Flood & Stormwater Management Agencies will be holding a Agency to Agency Flood Risk Mentoring Session in Newport Beach, CA on April 23, 2015. More »

OC Water Districts Prepare for Emergencies

Cox OC Connections has a regular program about infrastructure in Orange County and is hosted by Lacy Kelly from Association of California Cities Orange County.  This weeks topic was related to water districts in Orange County preparing for disasters.  More »

Using 3D-Hybrid Animation of XPSWMM Results as a Tool to Educate Stakeholders and Communities on Flood Hazards

At the Orange County Branch EWRI February Luncheon, presenters from Michael Baker International presented the use of 3D animation to convey advanced hydraulic modeling results. Two case studies were used as examples to verify the use of 3D animation. More »

What the Passage of the Proposition 1 Water Bond will mean for Southern California

An update on plans for spending funds for the $7.5B Proposition 1 Water Quality, Supply, and Infrastructure Improvement Act of 2014 (aka “Water Bond”). The Governor’s 2015-16 Budget shows that $532M of the Proposition 1 funds will be made available initially. Although limited information is currently available regarding specific projects that will benefit from Proposition 1 and their timing, highlights for Southern California are provided in this article. More »

Thank You IRWD and Presenters for the Drought and OC Water Infrastructure Seminar

The Sustainability Committee for ASCE-OC organized a seminar entitled “The Drought and Water Infrastructure” on Friday, October 31, 2014. More than 30 professionals and 7 civil engineering students attended the seminar. The seminar was conducted at the Irvine Ranch Water District (IRWD) Multi-Purpose room. In addition to hosting, IRWD also provided refreshments and IT support. We would like to thank IRWD for their contribution to educate the civil engineering professionals on ways different agencies are implementing sustainable infrastructure and water efficiency programs. More »

Gobernadora Basin – An Innovative Multi-Objective Basin for Stormwater Treatment and Reuse

It’s rare to find a single flood control design facility which can provide numerous functions and meet multiple objectives.  The Gobernadora Detention Basin, located in Southern Orange County, California, accomplishes just that.  The innovative stormwater management multi-purpose basin is the very definition of integrated watershed planning with the intent to maximize water resources beneficial uses.  On Thursday, December 4, 2014, attendees of the Orange County Environmental and Water Resources Institute (OC EWRI) Technical Luncheon were treated to an in depth and personal exploration of the proposed 30-acre Gobernadora Detention Basin. More »

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