El Nino Affects Sediment Removal Needed Above Devil’s Gate Dam

first_img More Cool Stuff Community News HerbeautyA Mental Health Chatbot Which Helps People With DepressionHerbeautyHerbeautyHerbeautyWho Was The Hollywood ‘It Girl’ The Year You Were Born?HerbeautyHerbeautyHerbeauty10 Most Influential Women In HistoryHerbeautyHerbeautyHerbeautyShort On Time? 10-Minute Workouts Are Just What You NeedHerbeautyHerbeautyHerbeautyStop Eating Read Meat (Before It’s Too Late)HerbeautyHerbeautyHerbeautyTiger Woods Is ‘Different Man’ 10 Years After ScandalHerbeautyHerbeauty Get our daily Pasadena newspaper in your email box. Free.Get all the latest Pasadena news, more than 10 fresh stories daily, 7 days a week at 7 a.m. faithfernandez More » ShareTweetShare on Google+Pin on PinterestSend with WhatsApp,Virtual Schools PasadenaHomes Solve Community/Gov/Pub SafetyPasadena Public WorksPasadena Water and PowerPASADENA EVENTS & ACTIVITIES CALENDARClick here for Movie Showtimes Make a comment Your email address will not be published. Required fields are marked * Name (required)  Mail (required) (not be published)  Website  Community News EVENTS & ENTERTAINMENT | FOOD & DRINK | THE ARTS | REAL ESTATE | HOME & GARDEN | WELLNESS | SOCIAL SCENE | GETAWAYS | PARENTS & KIDS Top of the News center_img Pasadena’s ‘626 Day’ Aims to Celebrate City, Boost Local Economy First Heatwave Expected Next Week The El Nino phenomenon could delay plans by the Los Angeles County Department of Public Works to remove 2.4 million cubic yards of sediment from the Hahamongna flood-control basin above Devil’s Gate in Pasadena.Hydro Review Magazine and its online edition, HydroWorld.Com, report that sediment removal is planned during the next five years, though actual work is not scheduled to begin until 2016.Experts forecast that El Nino may produce heavy rains throughout the winter of 2015, which could cause more debris accumulating into the Hahamongna area from the 2009 Station Fire. This could threaten the dam’s structural integrity and cause flooding to neighborhoods downstream.Areas under threat would include the Arroyo Seco American Viticultural Area (AVA) southeast of Monterey Bay.Devil’s Gate, a 100-foot high concrete gravity arch dam, was built in 1920 in the Arroyo Seco as the first flood control dam in LA County. The dam supports a 5,323 acre-feet capacity reservoir within the Hahamongna Basin.Dam safety officials say failing to complete the debris removal project, as well as future sediment removal, could result in overtopping the dam. Structural failure could inundate a significant area.Officials say there is risk of flooding south of the dam if the San Gabriel Mountains are hit with a hard El Nino winter, sending large amounts of mud, rocks and burned trees into an already full Hahamongna basin.“The dam, since it was constructed, was built in size to provide a certain level of flood protection to downstream communities,” officials said. “The quantity of sediment that we’re recommending to remove allows us to provide historical levels of flood protection to the downstream communities.”Major sediment-removal projects are also planned for dams in Pacoima, Tujunga and three other locations in the San Gabriel Mountains. Pasadena Will Allow Vaccinated People to Go Without Masks in Most Settings Starting on Tuesday 0 commentsShareShareTweetSharePin it Government El Nino Affects Sediment Removal Needed Above Devil’s Gate Dam Published on Tuesday, September 29, 2015 | 11:29 am Home of the Week: Unique Pasadena Home Located on Madeline Drive, Pasadena Subscribe Business Newslast_img

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