Introduction
The topic of this literature review is restoration of the lower Colorado River Delta; the review will focus on pulse water flows as a method of restoration. Pulse flows are planned water releases from dams following years of water and sediment buildup behind dams. Hydrologist and advocates of pulse water releases believe that by adding water to a dry system, they can restore riparian areas by germinating native plants and providing habitat for endangered species. Furthermore, these pulse water flows can increase the productivity of fisheries, benefiting the public in downstream regions of the river.
Today, pulse flows are being released at the southernmost dam of the Colorado Rivers as a part of a bi-national agreement between
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The review will summarize the costs and benefits of Minute 319, in the context of ecological and environmental health. The potential impacts on municipal and agricultural water resources will be addressed.
The review will answer the following questions:
• How much water should be allocated for successful restoration?
• What parameters indicate successful restoration?
• What were some results of pulse water releases, and what are some management implications?
Annotated Bibliography Glenn, Edward P., Karl W. Flessa, and Jennifer Pitt. 2013. “Restoration Potential of the Aquatic Ecosystems of the Colorado River Delta, Mexico: Introduction to Special Issue on ‘Wetlands of the Colorado River Delta.’” Colorado Delta Wetlands 59 (0): 1–6.
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The paper includes a description of the wetlands and their ecological importance, as well as the political and economic impacts the highly managed and controlled system has on the areas that use its water. The paper summarizes and provides context for the preliminary research projects in the region. The paper states "water dedicated to the delta ecosystem will come at a cost". This is an important issue and refers to the fact that the water that is allowed to naturally flow downstream for environmental restoration purposes will not be used for municipal or agricultural use. The paper does not quantify the costs. It does however state, that the amount of water allocated for restoration in the delta will not be determined by science alone, but will most likely be determined by policy makers and stakeholders. Consistent monitoring of the ecological changes following the pulse flow release is essential for better management and continuous restoration of the river's riparian areas and the Colorado River Delta. Ramírez-Hernández, Jorge, Osvel Hinojosa-Huerta, Mauricio Peregrina-Llanes, Alejandra Calvo-Fonseca, and Edgar Carrera-Villa. 2013. “Groundwater Responses to Controlled Water Releases in the Limitrophe Region of the Colorado River: Implications for Management and Restoration.” Colorado Delta Wetlands 59 (0): 93–103.
Federal Emergency Management Agency’s article, “Benefit of Dams” (2012) analyzes how dams prevent flooding by releasing the excess water in controlled amounts through floodgates (¶ 3).
The one feature common to the Hoover Dam, The Mississippi river and the three gorges dam is that they all tried to control nature’s swings, specifically in the form of flooding. Before the Hoover dam was built, the Colorado river “used to flood spectacularly…but after 1900 the Colorado provoked a vehement response” (Pg 177). The response was simple, but large. The U.S. built several large dams, including the Hoover dam, on the Colorado to decrease its flooding and increase power and irrigation. Unfortunately, just as human control of the Colorado’s flooding increased, its organisms and habitats were detrimentally influenced, and the water became more and more salinated.
As dams became old and upkeep costs rose many were torn down. This allowed the river to flow freely again and the salmon population increased by 20%. It was discovered that the best way to increase the diminishing salmon population was to simply restore the rivers to their original state. In 2008, a judge ordered for the Columbia and Snake River dams to spill water, allowing the rivers to flow as they would naturally. This water flow allowed the salmon to swim along the currents, as they would have once done
The negative aspects of Glen Canyon Dam greatly exceed the positive aspects. The dam’s hydroelectric power supply is only three percent of the total power used by the six states that are served by the facility. There is a surplus of power on the Colorado Plateau and with more and more power-plants being created in the western hemisphere, Glen Canyon Dam’s power is not needed (Living Rivers: What about the hydroelectric loss). Although the ‘lake’ contains twenty seven million acre feet of water, one and a half million acre feet of water are lost yearly due to evaporation and seepage into the sandstone banks surrounding the ‘lake’ (Living Rivers: What about the water supply?). The loss of that much “water represents millions, even billions of dollars” (Farmer 183). If the government were to employ more water efficient irrigation practices, as much as five million acre feet of water per year could be saved.
...nks distinguish between preserved, restored, or created credits, conservation banks currently do not. The FWS’s federal guidance and California’s guidance do not state a preference for restored, enhanced, created, or preserved habitat, but approximately 94% of conservation bank credits are derived from preservation. Regulatory agencies often struggle with awarding credits for created wetland habitat due to performance risks and doubt about ecological value. Habitat creation for conservation banking has yet to be tested. Another issue of concern to conservation banking and preservation habitat is long-term management. Unless there is active management on areas where the ecosystem relies on it (e.g., controlled burning, invasive species control), using preservation for mitigation could lead to a net loss of habitat for a particular species. (Fox and Nino-Murcia, 2005)
...n, the Louisiana wetlands are an extremely valuable asset to the State of Louisiana and the United States. The continual loss of Louisiana wetlands has the potential to have an immensely negative effect on the economy at a state and national level. Over 2 million people live in the Louisiana coastal parishes (Field et al., 1991). The majority of people living on the Louisiana coast make their living from things that are directly related to the wetlands. The Louisiana wetlands make up the largest wetland community in America and is being lost at a rate greater than the other wetland communities in the country. The suggested strategies that are being taken into consideration could be helpful but it seems that the State of Louisiana is not as concerned as it should be given the future consequences and much like climate change coastal erosion is not being taken serious.
Colorado River Hydrosphere A case study of * River management * People interfering in the hydrosphere * Balancing water from one area to another The Colorado river - basic facts It flows through southwest United States and northwestern Mexico. It is 2334 km (1450 miles long), the longest river west of the Rocky Mountains. Its source is west of the Rocky Mountains which is the watershed in northern Colorado, and, for the first 1600km (1000miles) of its course, passes through a series of deep gorges and canyons that were created by the eroding force of its current. The river flows in a generally southwestern direction across Colorado into south eastern Utah, where it is joined by its chief tributary, The Green River. After crossing the northern portion of Arizona, the Colorado flows west for 436 km (271 miles) through the majestic Grand Canyon.
Conflict between residents in northern Nevada and SNWA has risen (Brean, 2015). In 2012 the U.S. Bureau of Land Management announced its support of SNWA wanting to build a pipeline from rural Nevada to Las Vegas, rural Nevada being primarily in the northern portion of the state (Larsen et al., 2015). Residents including farmers who depend on water for their crops argue that redirecting water supplies would harm the environment and wildlife that inhabit northern Nevada (Brean, 2015). There is also an issue of oversubscription, this is due to the Colorado River not only supplying water to Nevada but neighboring states which include “Wyoming, Colorado, New Mexico and Utah” (Wockner, 2014). Both Arizona and California are expecting water shortages in the future as they too depend on the Colorado River (Wockner, 2014).
Water has long been a controversy in countless places worldwide and Colorado is no exception. The water rights in Colorado involve different stages within the Prior Appropriation Law; the senior and junior water rights. Senior water rights are privileges that were the first to be issued on unappropriated streams in Colorado and are to be filled before the junior water right holders. Junior water rights are similar to senior water rights, but are filled after the senior water holders take their allotted amount (Wolfe Prior Appropriation Law). The water in Colorado is just that; Colorado’s water, owned by the people and restricted by the state. However, Colorado is required by law to send over 30 million acre – feet of water to seven western states (“Missouri River”). An acre – foot is “The quantity of water required to fill one acre with one foot of water and is equivalent to 43,560 cubic feet or 325,850 gallons” (“Missouri River”). The State enforces all water laws in Colorado even though they are not straightforward and are riddled with loopholes. These water laws came into effect “As early as 1879” (Hundley, Jr. 53). In the laws, there are even more constraints and idiosyncrasies including; owning ground water, owning surface water, senior rights and junior rights, and the use and reuse of rainwater or graywater. Water users in Colorado need to familiarize themselves with the laws and regulations involving water in order to receive the allotted water and the reasoning behind that number.
The Florida Everglades is one of the most diverse wetland ecosystems in the United States. These tropical wetlands span an area of more than seven hundred square miles in southern Florida. The term Everglade means river of grass. The system starts in central Florida near Orlando and travels southwest to the tip of Florida. The Everglades has a wet season and a dry season which causes a great change in hydrology. During the wet season the system is a slow moving river that is sixty miles wide and over a hundred miles long. During the dry season water levels drop and some areas will completely dry up. The Everglades has many different aquatic environments all having interdependent ecosystems. The most important factor for all these environments is water. It helps shape the land, vegetation, and all the organism that live in each area. Each environment has particular needs for the organisms living in that area. Throughout the years humans have diverted the water to fit their varying needs. The state has built dikes and levees, dug canals, and have built locks to divert the water. This has all been done to keep areas completely dry for developing and agricultural needs. Today, The Everglades is half the size of its original size. Throughout the years many restoration acts have been created and updated. The Everglades restoration projects have been the most expensive environmental repairs in The United States. This is because The Everglades is one of the three most important wetland areas in the world. The Everglades National Park is the home of thirty six protected species including the West Indian Manatee, the American Crocodile, and the Florida Panther. The Everglades also homes hundreds of species of birds, fish, mammals, and repti...
Americans today tend to believe that the Colorado River drought has been a recent occurrence, although drought relief strategies have been implemented since early 1997. To summarize, in the book The Colorado River Basin Drought Planning and Organizations, Colorado is named as the original state to acquire a drought relief plan. For instance, various assume water levels are diminutive in the Colorado and blame is due to the previous ten years of drought throughout the United States. Although it is true that water levels are at a record low, initial plans in the early 1920’s to introduce manufactured structures into the water basin is the original reason Colorado’s water system began to be compromised. It follows, then the supplementary natural
Terrell (2015) states that the three inch delta smelt was decided to be in danger of going extinct a little more than twenty years ago. The U.S. Fish and Wildlife Service has claimed that systems used by farmers to retrieve water from the delta have added to the dropping number of delta smelt. Conservationists think it is necessary for people and farmers to take their water from sources other than the delta in order to preserve the characteristics of the delta (Terrell, 2015). Dr. Peter Moyle of UC Davis stated in an interview,“We have 80 fish species in California, like the delta smelt, that are in trouble” (Cited in Terrell, 2015, p.12). Moyle insists that it is more than just the three inch delta smelt that is in danger, it is at least seventy-nine other species that need protecting as well. As interviewed by Siegler (2015), senior water rights farmer, Rudy Mussi knows the importance of the delta and preserving it, not just so he can use its water on his fields, but also to keep it alive for the future. It has been suggested that water be taken out of the delta and moved to farmers in the lower portion of California who have junior water rights (Siegler, 2015). The delta cannot be overused because it is important that the ratio of saltwater to freshwater stays the same in order to preserve the fish population. In 2014 the excess water that came from the delta, the environment in which the fish live, added up to almost two hundred fifty billion gallons of water or enough for over six and a half million people each year (“Water wars”, 2015) While these people cannot easily access this water source, some farmers are able to use limited amounts of water if they farm on the delta, creating an issue between the junior water rights farmers
Globally coastal wetlands are disappearing at an alarming rate, the problem is most of society does not realize the value of these precious wetlands. Coastal wetlands provide an important role in the coastal ecosystem. “Coastal wetlands provide critical services such as absorbing energy from coastal storms, preserving shorelines, protecting human populations and infrastructure, supporting commercial seafood harvests, absorbing pollutants and serving as critical habitat for migratory bird populations”(Anonymous, 2011). Coastal wetlands are an economical asset as well as an environmental one.
Between 300 and 400 million people worldwide live in areas near wetlands and depend on them. Wetlands are mechanisms for treatment of wastewater are extremely efficient because they absorb chemicals and filter pollutants and sediments. Half the world's wetlands have disappeared due to urbanization and industrial development. The only way to achieve sustainable development and poverty reduction will be through better management of rivers and wetlands, and the land they drain and drain as well as through increased investment in them.
Smith, Zachary A., and Grenetta Thomassey. Freshwater Issues: A Reference Handbook. Santa Barbara, CA: ABC-CLIO, 2002. Print