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Matilija Dam
Matilija Dam is a concrete arch dam in Ventura County, California, completed in 1947. Designed for water storage and flood control, it impounds Matilija Creek to create the Matilija Reservoir in the Los Padres National Forest, south of the Matilija Wilderness and north of Ojai. The drainage area above the damsite is 55 square miles, and the reservoir had an original capacity of . Matilija Creek flows on to become the main tributary of the Ventura River. Matilija was one of the Chumash rancherias under the jurisdiction of Mission San Buenaventura. The meaning of the Chumash name is unknown. History In the 1940s, the Ventura County Flood Control District was formed to manage water resources along the Ventura River. A dam on Matilija Creek was proposed as part of a project to improve groundwater recharge around Ojai, where groundwater reserves had been exhausted by agricultural use and drought. In 1941 the U.S. Army Corps of Engineers warned that the dam would not be economic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ojai, California
Ojai ( ; Chumash: ''’Awhaỳ'') is a city in Ventura County, California. Located in the Ojai Valley, it is northwest of Los Angeles and east of Santa Barbara. The valley is part of the east–west trending Western Transverse Ranges and is about long by wide and divided into a lower and an upper valley, each of similar size, surrounded by hills and mountains. The population was 7,637 at the 2020 census, up from 7,461 at the 2010 census. Ojai is a tourism destination known for its boutique hotels, recreation opportunities, hiking, and farmers' market of local organic agriculture. It has small businesses specializing in local and ecologically friendly art, design, and home improvement. Chain stores are prohibited by city ordinance to encourage local small business development and keep the town unique. The name Ojai is derived from the Mexican-era Rancho Ojai, which in turn took its name from the Ventureño Chumash word Awha'y'', meaning "Moon".Tumamait-Stenslie, Julie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bechtel Corporation
Bechtel Corporation () is an American engineering, procurement, construction, and project management company founded in San Francisco, California, and headquartered in Reston, Virginia. , the '' Engineering News-Record'' ranked Bechtel as the second largest construction company in the United States. History Founding and early years Bechtel's business activities began in 1898, when cattle farmer Warren A. Bechtel moved from Peabody, Kansas, to the Oklahoma Territory to construct railroads with his team of mules. Bechtel moved his family frequently between construction sites around the western United States for the next several years, eventually moving to Oakland, California, in 1904, where he worked as the superintendent on the Western Pacific Railroad. In 1906, W. A. Bechtel won his first subcontract to build part of the Oroville-to-Oakland section of the Western Pacific Railroad. That year he bought a steam shovel, becoming a pioneer of the new technology. He pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Buildings And Structures In Ventura County, California
A building, or edifice, is an enclosed structure with a roof and walls standing more or less permanently in one place, such as a house or factory (although there's also portable buildings). Buildings come in a variety of sizes, shapes, and functions, and have been adapted throughout history for a wide number of factors, from building materials available, to weather conditions, land prices, ground conditions, specific uses, prestige, and aesthetic reasons. To better understand the term ''building'' compare the list of nonbuilding structures. Buildings serve several societal needs – primarily as shelter from weather, security, living space, privacy, to store belongings, and to comfortably live and work. A building as a shelter represents a physical division of the human habitat (a place of comfort and safety) and the ''outside'' (a place that at times may be harsh and harmful). Ever since the first cave paintings, buildings have also become objects or canvasses of much artistic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arch Dams
An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch forming a roof. Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the ancient Romans, who were the first to apply the technique to a wide range of structures. Basic concepts An arch is a pure compression form. It can span a large area by resolving forces into compressive stresses, and thereby eliminating tensile stresses. This is sometimes denominated "arch action". As the forces in the arch are transferred to its base, the arch pushes outward at its base, denominated "thrust". As the rise, i. e. height, of the arch decreases the outward thrust increases. In order to preserve arch action and prevent collapse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
San Clemente Dam
The San Clemente Dam was an arch dam on the Carmel River about southeast of Monterey in Monterey County, California of the United States. It was located just downstream of the Carmel River and San Clemente Creek confluence. Completed in 1921 to supply water to the Monterey Peninsula, the dam was removed in November 2015 due to safety and environmental concerns. Background The San Clemente Dam was implemented by Samuel Morse, owner of the Del Monte Properties Company, in order to supply municipal water to the growing population on the Monterey Peninsula. It would replace the Old Carmel River Dam which was built just downstream in 1883. At a cost of US$300,000, the arch dam was designed by J.A. Wilcox and constructed by Chadwick & Sykes Inc of San Francisco from 1918 to 1921. About of concrete was used in its construction. A fish ladder was constructed on the dam shortly after its completion. In 1930 Morse sold the dam to Chester Loveland, owner of the California Water and Telepho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dam Removal
Dam removal is the process of demolishing a dam, returning water flow to the river. Arguments for dam removal consider whether their negative effects outweigh their benefits. The benefits of dams include hydropower production, flood control, irrigation, and navigation. Negative effects of dams include environmental degradation, such as reduced primary productivity, loss of biodiversity, and declines in native species; some negative effects worsen as dams age, like structural weakness, reduced safety, sediment accumulation, and high maintenance expense. The rate of dam removals in the United States has increased over time, in part driven by dam age. As of 1996, 5,000 large dams around the world were more than 50 years old. In 2020, 85% percent of dams in the United States are more than 50 years old. In the United States roughly 900 dams were removed between 1990 and 2015, and by 2015, the rate was 50 to 60 per year. France and Canada have also completed significant removal pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cofferdam
A cofferdam is an enclosure built within a body of water to allow the enclosed area to be pumped out. This pumping creates a dry working environment so that the work can be carried out safely. Cofferdams are commonly used for construction or repair of permanent dams, oil platforms, bridge piers, etc., built within water. These cofferdams are usually welded steel structures, with components consisting of sheet piles, wales, and cross braces. Such structures are usually dismantled after the construction work is completed. The origin of the word comes from ''coffer'' (originally from Latin ''cophinus'' meaning "basket") and ''dam'' from Proto-German ''*dammaz'' meaning "barrier across a stream of water to obstruct its flow and raise its level"). Uses For dam construction, two cofferdams are usually built, one upstream and one downstream of the proposed dam, after an alternative diversion tunnel or channel has been provided for the river flow to bypass the foundation area o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AECOM
AECOM (, ; formerly AECOM Technology Corporation) is an American multinational infrastructure consulting firm. AECOM has approximately 51,000 employees, and is number 157 on the 2019 Fortune 500 list. The company's official name from 1990 to 2015 was AECOM Technology Corporation, and is now AECOM. The company is listed on the New York Stock Exchange (NYSE) under the ticker symbol ACM and on the Frankfurt Stock Exchange under the ticker symbol E6Z. In August 2021, AECOM announced plans to relocate its global headquarters from Los Angeles, California to Dallas, Texas. History AECOM traces its origins to Kentucky-based Ashland Oil & Refining Company, which in turn grew out of Swiss Drilling Company, founded in Oklahoma in 1910 by J. Fred Miles. He gained control of some 200,000 acres and formed Swiss Oil Company in Lexington. In 1924, Miles launched a refining operation called Ashland Refining Company, headed by Paul Blazer. While the parent company struggled, leading to t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soil Cement
Soil cement is a construction material, a mix of pulverized natural soil with small amount of portland cement and water, usually processed in a tumbler, compacted to high density. Hard, semi-rigid durable material is formed by hydration of the cement particles. Soil cement is frequently used as a construction material for pipe bedding, slope protection, and road construction as a subbase layer reinforcing and protecting the subgrade. It has good compressive and shear strength, but is brittle and has low tensile strength, so it is prone to forming cracks. Soil cement mixtures differs from Portland cement concrete in the amount of paste (cement-water mixture). While in Portland cement concretes, the paste coats all aggregate particles and binds them together, in soil cements the amount of cement is lower and therefore there are voids left, and the result is a cement matrix with nodules of uncemented material. CMS was invented by Benjamin Harrison Flynn to pave roads in Louisian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Casitas
Lake Casitas is a reservoir in Ventura County, California, built by the United States Bureau of Reclamation and completed in 1959. The project provides drinking water and water for irrigation. A secondary benefit is flood control. It was the venue for canoeing and rowing at the 1984 Summer Olympics. Casitas Dam was constructed on Coyote Creek, two miles (3 km) before it joins the Ventura River. Santa Ana Creek and North Fork Coyote Creek also flow into the lake. The system was designed for water from the Ventura River to be diverted into a canal under specific conditions since the impounded watershed is not sufficient to fill the lake. The dam is creating a lake capacity of . The dam was built as part of the Ventura River Project. In the center of Lake Casitas is 2 km Main Island, whose peak rises more than from the lake surface. History The lake filled and overflowed for the first time around the 1970s. During the 1984 Summer Olympics in Los Angeles, Lake Casitas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malibu, California
Malibu ( ; es, Malibú; Chumash: ) is a beach city in the Santa Monica Mountains region of Los Angeles County, California, situated about west of Downtown Los Angeles. It is known for its Mediterranean climate and its strip of the Malibu coast, incorporated in 1991 into the City of Malibu. The exclusive Malibu Colony has been historically home to Hollywood celebrities. People in the entertainment industry and other affluent residents live throughout the city, yet many residents are middle class. Most Malibu residents live from a half-mile (0.8 km) to within a few hundred yards of Pacific Coast Highway ( State Route 1), which traverses the city, with some residents living up to one mile (1.6 km) away from the beach up narrow canyons. As of the 2020 census, the city population was 10,654. Nicknamed "the 'Bu" by surfers and locals, beaches along the Malibu coast include: Topanga Beach, Big Rock Beach, Las Flores Beach, La Costa Beach, Surfrider Beach, Dan Blocker Beach, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rindge Dam
Rindge Dam is a dam on Malibu Creek in the Santa Monica Mountains of Southern California. Located in Malibu Creek State Park, it sits just northeast of Malibu Canyon Road, and is partially visible from the turnouts south of the tunnel. History The dam was built by hired workers of May Knight Rindge, who owned the Malibu Ranch, the former Rancho Topanga Malibu Sequit, at that time. The frame of the dam was constructed using rails from the Hueneme, Malibu and Port Los Angeles Railway, which was a 15-mile railroad that May Rindge built through the Malibu Ranch. The dual walls of the dam were built into an already-existing rock monolith in the center of Malibu Creek; the only place they meet is at the top. The main concrete arch of the Rindge Dam was completed in 1924. The spillway of the dam was finished in 1926. The behind the dam have been completely filled with sediment since circa 1950, which creates a waterfall from Malibu Creek. The dam became incorporated into Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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