Figure 1 provides the Hoover Dam Process Diagram explaining how everything works and how the water flows until different sections. Figure 2 and 3 are pictures of the Hoover Dam that were taken during the trip. The Hoover Dam was built between 1931 to 1935. More than 21,000 men worked every day and night to complete the construction. The purpose of building the dam was to provide a reliable water supply for the southern California and control the flow of the Colorado River [1]. It is one of the famous dams in the United States with a height of 726 feet, a length of 1244 foot, and a weight of 6.6 million tons. The project was completed almost 26 months ahead of schedule. Table 1 provides information that was taken from the day of the trip. The power output of the dam was 395 kwh, with an outflow of 11495 cubic feet per second [2]. The outflow of the dam provides how much water is flowing through the dam and the amount power is generating [3]. The percent full capacity of Lake Mead is 39% with a water depth of 1081.37 feet [4]. Lake Mead is a lake on the Colorado River and the largest reservoir in the United States in terms of water capacity. Lake Mead has not yet reached full capacity. Figure 4 provides a figure of the Mike O’Callaghan-Pat Tillman Memorial Bridge where we can see the Hoover Dam. The bridge helped reduced the number of vehicles traveling across the dam [5]. The role that the Hoover Dam has had is that it has help provide water to over 25 million people in the
3.5 million miles of water run throughout the United States; and since the country’s conception, over 80,000 dams have impounded 600,000 miles of these waters [1]. Dams were originally constructed to provide water to towns and establishes energy sources for mills and later hydroelectric plants. Because these dams were constructed decades ago, they’re reaching a critical point of obsoleteness where they cause more harm than good. Dam removal is increasingly popular across the country to address the ecological problems including habitat loss and sedimentation, despite potential for downstream harm, removing dams is more environmentally and economically cost effective than upgrading them. The Marmot, Glines Canyon, and Elwha river dam removal projects each highlight different challenges of dam removal, but overall
One of the largest geographic physical structures in the United States is the Colorado River. Human activity and its interaction with this great river have an interesting history. The resources provided by the river have been used by humans, and caused conflict for human populations as well. One of these conflicts is water distribution, and the effects drought conditions have played in this distribution throughout the southwestern region. Major cities such as Las Vegas, Los Angeles, San Diego, and other communities in the southwest depend on the river. It provides water for over 20 million people, irrigation for 2 million acres of land, four thousand megawatts of hydroelectric energy, and over twenty million annual visitors for
He found that the Colorado River was the best source. In 1925, the Department of Water and Power (DWP) was established. Now what came to be called the Colorado River Aqueduct, needed financing to be accomplished. Voters from the region approved a $2 million bond to perform the engineering needed for the aqueduct. In 1928, an act of the State Legislature, created the Metropolitan Water District of Southern California (MWD), and its purpose was to construct the Colorado River aqueduct to supply water to Southern California. By 1931, voters issued another bond for $220 million that would start the construction of the aqueduct. By 1941 the aqueduct was completed stretching 242 miles from the Colorado River to its final holding reservoir near Riverside, California. The Colorado River Aqueduct consists of more than 90 miles of tunnels, 55 miles of conduit, 30 miles of siphons, five pumping stations, 5 treatment plants, and 9 reservoirs. All of this can supply about 1.2 million-acre-feet of water every year, which is more than a billion gallons a day. This caused phenomenal growth of Los Angeles, San Diego and neighboring areas. The aqueduct is capable of lifting more than 1600 cfs to a static height of 1600 feet as it takes a path through mountains and deserts. Upon the completion of the Colorado River Aqueduct in 1941, the Municipal Water District began to wholesale Colorado River water to its member agencies. Today those agencies include 14 cities, 12 municipal water districts, and a county water authority. More than 130 municipalities and many unincorporated areas are served by this project of the DWP’s and Mulholland’s vision. Before Mulholland died on July 22, 1935, he lived to see the inaugurations of the Colorado River Aqueduct and Hoover Dam, constructed in the spirit of significance he had always
The Grand Coulee Dam, located in Eastern Washington, was one of controversy, risk, and a point of no return. While the water captured made the desert area blossom in agriculture and it powered some large cities, it created a sense of accomplishment, that humans can control Mother Nature. While many people were very excited for this new construction – which gives power and resources - at the time, some thought it should not be allowed, they are not proud of containing the Columbia River. In this analysis, I am going to focus on the economic and social effects that the Grand Coulee Dam created in its build.
The article “Down go the dams” by Jane C.Marks aim to provide an informative view on the current pending issue on Dams. The article starts out my mentioning the important nature of dams in our society. For example, Jane C.Marks states that today about 800,000 dams operate worldwide as well as the fact that most were built in the past century, primarily after World War II. Furthermore, the author lays down informative facts about dams such as the fact that dams control flooding and their reservoirs provide a reliable supply of water for irrigation, drinking and recreation which are all very important to society. In an economic standpoint, although it is very high maintenance dams provide jobs for people. The
This source is useful because it gives detail at the time the Buford dam was created, the 2009 ruling, and the 11th Circuit Appeal. Compared to the other sources, this source details out the specifics of the purpose of the dam and how
Beside these arguments, there is also a more quantitative side to the debate. The ecological detriments of the Glen Canyon Dam have been well-documented. Extensive changes were brought about in the Colorado River ecosystem by the construction of the Glen Canyon Dam. Most of these alterations negatively affected the functioning of the system and the native aquatic species of the river. The reduced supply and transport of
of Lake Mead. The graph calculates when the reservoirs level increases and when there is a drought. The reservoir was formed by the Hoover Dam on the Colorado River in
“The Three Gorges Dam will be the largest hydropower station and dam in the world, with a 1.2 mile stretch of concrete and a 370 mile-long reservoir and 525 feet deep.”[4] To put that into understandable dimensions it will be the length of the Golden Gate Bridge, and twice as tall. “The reservoir created by the backflow of the dam will extend 360 miles up river to Chongqing, a distance equal to nearly half the length of California.”[5] So what is the point of this monstrosity? The major prospective benefits will be power generation, flood control, and increased navigability of the Yangtze River. Many people debate whether these attributes will actually be as beneficial as builders expect. The drawbacks of the dam are its flood plain and the effects of the flood plain, environmental damage, resettlement, historical and cultural loss, and the ideas of speculators about whether or not some of the dam’s abilities are true.
Until the early 1850's California's rivers flowed freely to the Pacific Ocean. The emergence of dams started with small earthen dams used to divert water for mining and irrigation purposes. The diverted water used for hydraulic mining would prove to be the beginning of a long era of environmental degradation of California's river ecosystems. With the turn of the century came a population boom and the rapid development of urban centers and an increased demand for water. With the end of the gold rush, agriculture quickly became the main player in California's economy. This too, raised the demand for water and dams were being built at a staggering pace. The introduction of huge hydropower dams proved to be the "nail in the coffin" for anadromous fish because little or no heed was paid to the impact of dams on the state's watersheds. Today California has over fourteen hundred dams responsible for
Certain models predict that drought activity is expected to increase toward the end of the 21st century and particularly in the Colorado River Basin (MacDonald & Turner, 21260). When the dam was built in the early 20th century, annual flow was about 17.0 MAF (million acre-feet) at Lees Ferry, Arizona which is a few miles below the dam. Estimates calculating the past MAF of the Colorado River average to about 13.8-14.6 over the last 450 years. Thus, the dam was built in a period with an unexpectedly high MAF. Alarmingly in 2000 the river averaged less than 9 MAF. (Bolin, Seetharam, & Pompeii, 263). In 2002, the river reached a low of about 6.2 MAF (MacDonald & Turner, 21256). Some models estimate that the river could reach the range of 1.5 to 4.5 MAF in the next 30–50 years. (Bolin, Seetharam, & Pompeii, 271). The reduction of MAF in the Colorado River is due to drought. Droughts have been occurring throughout the 20th century with droughts from 1900-1904, 1924-1936, 1953-1964, and 1988-1991. These droughts are associated with warmer regional temperatures and the level of warming is deemed exceptional for the 21st century (MacDonald & Turner, 21257). Recently the Colorado River has experienced the lowest 5 year mean flows on record (MacDonald & Turner, 21257). If river flow is low, so is Lake Powell’s water level. One study suggests that Lake Powell have a 50% chance of receding to inoperable status by the 2020’s
1. Why was the building of the dam first proposed in 1919 and by whom?
“Approximately 3% of power used in the four corners area…Most of the power from the dam is purchased for commercial use at heavily subsided rates.” (Glen Canyon Institute). Shows who really uses the power and who this will really effect in weather we drain the lake or not. “The Glen Canyon Dam generates 451 megawatts, which is negligible compared to most of the other power generating stations in the regions.” (Glen Canyon Institute). Show how much energy is generated through this dam. “The glen canyon dam does not generate “Clean” power. While we are correct to say there is no air pollution from the dam, the 186 mile long reservoir” (Glen Canyon Institute). Knowing that the power is not clean can alter the opinion of some people. This benefit is something that is not as huge as a benefactor as most but still it contributes to the case that we should keep this man made
As previously mentioned, the Boulder Dam was one of the most famous, and certainly most expensive (with the whole project costing about $385 million) public works program. To provide jobs and much needed money to unemployed Americans, the Bureau of Reclamation, under President Hoover, authorized the Boulder Canyon Project on the Colorado River in 1928. The entire project included a hydroelectric power plant and a reservoir to control floods of the Colorado River and supply power to the Pacific Southwest. The dam reservoir is Lake Mead, which can store approximately 28 million acre-feet of water, making it one of the world’s largest artificially created bodies of water. Besides providing many jobs, the project responsible for the officially named Hoover Dam (as of 1947), added about 3 million acres of national parks and monuments and expanded
Unfortunately for this growth, the demand far exceeds the available supply. The Bureau of Reclamation completed the last major dam (Glen Canyon) in 1966. The Bureau built several smaller dams, along with Glen Canyon, under the auspices of the Colorado River Storage Project