Ppt on earth dam construction

Effective-stress Based Dynamic Analysis and Centrifuge Simulation of Earth Dam Yii-Wen Pan 1 Hui-Jung Wang 1 C.W.W. Ng 2 1 National Chiao-Tung University.

、 0.5 、 1kg/cm 2 Monotonic CU tests  c = 0.3 、 0.5 、 1 kg/cm 2 Dam Construction Modeling Static Stress Analysis Modeling Seepage Analysis (obtain steady state phreatic surface) Stress Analysis after Steady State Seepage (static equilibrium after /) Effective Stress Based Numerical Analysis Pore Water Pressure Acceleration Settlement Application in Li-Yu-Tan Dam Li-Yu-Tan Dam A well instrumented earth dam. Data was successfully recorded in Chi-Chi earthquake Input motion in numerical simulation Using the /


PRESENTATION ON MANGLA DAM MADE BY: SYED ALI ZULQADAR. ROLL NO: 37.MAJOR: SES 5 th.

designed and supervised by Binnie & Partners of London, and it was built by Mangla Dam Contractors, construction firms, Atkinson Company of South San Francisco. The reservoir created by the dam is about 40 miles long, having a storage capacity of 5.88 million acre feet/ million acre feet and live storage capacity is 5.34MAF. It is the second largest earth filled dam of our country. It is the second largest earth filled dam of our country. The project is providing 400,000 kilowatts of electricity and 88 laic /


Hoover Dam A MODERN MARVEL. Project Overview Why Build a Dam? Before the Hoover Dam was built, the Colorado River was dangerous and unpredictable. Towns.

followed by the sides, and then the ceiling. The tunnels were completed that November, and are three feet thick. Earth and rock were then dumped into the river, forcing it into the tunnels. Water flowed freely through the tunnels for /movable towers that allowed them to work on different parts of the dam. An automatic concrete plant was constructed on the canyon rim as the dam got taller. Dam Construction Continued The Hoover Dam was built with interlocking concrete blocks that connected to each other like/


PART II: THE ATTEMPTED DAMMING OF THE FRANKLIN RIVER 1983 Attitudes to the Environment.

the World Heritage Properties Conservation Bill, which became law on 22 May 1983. This legislation effectively stopped construction of the dam under the federal governments (and Australias) obligation to UNESCO. The Tasmanian Liberal government immediately challenged the / to exist‘ TWS campaign message: ‘Work. Consume. Be Silent. Die: It’s Costing the Earth’ Attitudes: HEC Pushed for the Franklin dam as according to them it had many economic advantages in creating low-cost clean energy and attract more/


Three Gorges Dam on Yangtze River Dams and The Drive to Develop One of the most common features in the drive to development is the construction of riverine.

moved about 102,600,000 cubic metres of earth. Satellite View of Three Gorges Dam Three Gorges Dam crossing Yangtze River at Sandouping, Yichang, Hubei province, China. Ship lock consist of 5 locks each: 918 ft. long 35 ft. wide With a water depth of 16.4 f t. Construction of the Dam Construction In order for the dam to be created, millions have to be relocated/


Company LOGO NEW CONSTRUCTION TECHNOLOGY A proposal having opportunity to generate Rs 2,10,600 Cr. (US $468 Billion) the saving part only for construction.

this earth using present technologies when one can avail this technology at much reduced cost i.e. 36% lower than present construction cost as explained here after and in shortest possible time required for all kinds of constructions be it: “Buildings, Bridges, elevated corridors for transport, fly-overs, roads, drainage, dams, water tanks, man hole covers etc. SUPER FAST CONSTRUCTION TECHNOLOGY INNOVATION : NEW PROCESS INVENTOR/


S5E1c: Students will relate the role of technology and human intervention in the control of constructive and destructive processes.

Georgia, but are rare.  Earthquakes usually happen along fault lines, or at the edges of plates.  Earthquakes can be constructive, like forming mountains or lakes.  Most earthquakes are deconstructive.  Roads and bridges are damaged, and buildings fall down. Scientists/ of earth or concrete built along the banks of a waterway.  It keeps rising flood within channels.  Dams hold back water that rushes downstream.  By building dams, we change the natural flow of Earth’s water.  Also, the dam stops the/


NCED Stream Restoration Toolbox The Dam Remover: MARK1 By: Alessandro Cantelli February 2006 – Version 1.0.

3.Medium size dam scale: results for volume sediment transport/unit width Legend in seconds 57 Future versions of the program are under construction!!! In particular the next new version will include: Sediment mixtures Deposition processes downstream the dam Work in process /59 The information on this site is subject to a disclaimer notice. Thank you for visiting the National Center for Earth Dynamics Web site and reviewing our disclaimer notice. The Web site is for informational purposes only and is not /


EARTH SCIENCE Prentice Hall EARTH SCIENCE Tarbuck Lutgens 

Geothermal Facility What is tidal energy?- energy production from the ocean How does it work? Tidal power is harnessed by constructing a dam across the mouth of a bay or an estuary in coastal areas. The strong in-and-out flow of tidal water/warming—the unnatural warming of the lower atmosphere. Major Primary Pollutants and Their Sources What are the effects of land pollution?  Earth’s land provides soil and forests, as well as mineral and energy resources  Damage to Land Resources: Increased soil erosion /


Global Water Resources and Use. Freshwater and Salt water 70% of the earth is covered by water Oceans hold 97%, freshwater is about 3% Of the freshwater.

the average amount of freshwater allocated per person for all purposes is about 500,000 gallons. Lakes Most lakes on Earth are located in the N Hemisphere at higher latitudes and are generally found in mountainous areas, rift zones, areas with / and dishes. Turn off water when brushing teeth. Check for and repair leaks. Water at night or early morning Construct dams and reservoirs: interferes with fish migration and destroys natural rivers. Leakages, earthquakes, evaporation and sediment build up. Up to 60/


By: Ryan Besachio. How Water is Used to Make Energy Water is formed by a dam blocking a river, creating an artificial lake called a reservoir. Water flows.

gases. They do not pollute the atmosphere. Disadvantages From Using Hydropower Dams are extremely expensive to build and must be built to a very high standard. The high cost of dam construction means that they must operate for many decades to become profitable. The/ nutrients with it. Much more fresh water is stored under the ground in aquifers than on the earths surface. The total amount of water on the earth is about 326 million cubic miles of water. The United States uses about 346,000 million gallons of/


CROSS CANADA LECTURE TOUR SPRING 2009

NRC Associate Committee on Geotechnical Research. Edited by I.C. MacFarlane. University of Toronto Press, 297 pp. Nichol, D. 1998. Construction over peat in Greater Vancouver, British Columbia. Proc. Inst. of Civil Eng.: Municipal Engineer, 127: 109-119. Perrin, J. / Columbia. Proc. 34th Can. Geot. Conf., Fredericton, NB. Silburn, J.D. 1972. Peat as the impermeable membrane in an earth dam. Symp. on Peat Moss in Canada, Univ. of Sherbrooke. Skempton, A.W. 1957. Discussion: The planning and design of the/


Rock Structure and Fault Activity chapter 9. What is structural geology The study of the forms of the Earth’s crust and the processes which have shaped.

Structure and Fault Activity chapter 9 What is structural geology The study of the forms of the Earth’s crust and the processes which have shaped it analysis of displacement and changes in shape / –the area was supposed to be low seismicity Auburn Dam foundation construction –earthquake occurred 5.7 –regional fault study –reassessment 32 km trenches more borings surface excavations aim to establish the time relationship of the faults Auburn Dam Concluded that the faults wee formed in another tectonic setting/


Dams. Enhanced economic prosperity Public health Agriculture Altered natural environments Reduced streamflows Water quality degradation Fish and wildlife.

Fish and wildlife Dams Ancient Cultures Earth, rocks, logs Flood control and irrigation Dams Flood control Irrigation Redistribution Recreation Navigation Electricity Dam Basics Components Face – exposed surface of the structure Abutments – sides of the dam Crest – top of the dam Toe – / gallons 581 feet deep 110 miles long 2000 megawatts Grand Cooley Dam Concrete Gravity Dam Columbia River in Central Washington Constructed 1933-1941 Grand Cooley Dam Largest concrete Structure in the U.S. 550 feet high 5223/


2 Lakeside Drive, Pawling NY 12564

6” Street Address: NYS Route 292 Current Purpose of the Dam: Recreation and Conservation Constructed: ca. 1837 Length: 330 feet Structural Height: 18 feet Hydraulic Height: 15 feet Crest Width: 30 feet Type of Dam: Earth embankment with dry stone masonry walls Low-Level Outlet: 20/side and possibly a stone masonry wall on the upstream side. Earth fill composing the bulk of the dam Very common construction for this region in the 1800’s In 2012 this dam will be 175 years old and has had very little maintenance/


No. 17 of 19 Geosynthetics in Dams by Daniele Cazzuffi ENEL Hydro, Milan, Italy. The information presented in this document has been reviewed by the Education.

Facing After the Rehabilitation Works. Concepcion RCC Dam in Honduras La Parade Homogeneous Earthfill Dam 1,2,3 4, 5 : Construction layers La Parade Homogeneous Earthfill Dam Codole Rockfill Dam : France Valcros Earth Dam : France Placing the Geotextile Filter in the Upstream Facing of Valcros Dam Hans Strijdom Zoned Rockfill Dam Maraval Dam – France (1976) Maraval Dam Davis Creek Dam : USA Surface Erosion Control Moochalabra Dam : Australia 1.Steel Mesh 2.Rockfill 3/


Geology of Plutonic Rocks

residual soil disposal of water in weathered terrain, erosion susceptible dams earth fill dams can be placed on soil profiles of I-IV possible V concrete dams can be placed on sound rock and possible zones I and II Permeability a problem in weathered zones Permeability between sheets common Serpentine is not suitable for any dam construction underground works weathering down to 60 m (500 m/


Hydroelectric power & its impacts

in: concrete technology. earth-moving machinery. Purpose of dams Initially, big dams were solely for generating electricity but subsequent (and current) uses include: Dams on a global scale Global stats*: most active phase of dam construction was 1950-1980’s; an average of 885 dams completed per year. 1961: 7408 large dams registered worldwide. by 1986: _____ large dams. * Source: International Commission on Large Dams Construction of dams by decade (1900-2000/


EMgt 9407 Topic-03 Construction Technology Foundation Systems Dr. Attaullah Shah.

earth) reinforcement. One form of this process is known under the trademark name Reinforced Earth. STABILITY OF EXCAVATIONS FIGURE 10-17. Soil reinforcement. PROTECTING EXCAVATIONS AND WORKERS Excavation cave-ins are responsible for the greatest number of U.S. construction/its strength or stability, protect foundations, or reduce groundwater flow. Grouting of rock is widely employed in dam construction and tunneling. –The need for such grouting is determined by exploratory methods such as core drilling and /


Groundwater Dams  In most lowlands of Ethiopia where the annual rainfall is below 600 mm, the rains in the highlands drains towards the low elevation.

 Groundwater dams can be constructed from locally available materials such as clay, brick, stone, concrete etc.  In Brazil, to store rainwater runoff entrenchments are dug below the ground surface in a shallow soil toward the impervious crystalline sub soil. Then, inside the entrenchment, earth or rock fill dams are built with a PVC sheet on the upstream face and around seeping zones avoiding seepage/


A. Hydrologic cycle A. Hydrologic cycle o The hydrologic cycle is a summary of the circulation of Earth’s water supply o Processes involved in the hydrologic.

o Runoff o Transpiration The hydrologic cycle The hydrologic cycle Sources of Earth’s water Sources of Earth’s water Where does rain go? o Evaporation or Transpiration 66/Less infiltration o More runoff o More flooding o Specific causes: o Deforestation o Construction and paving o Channelization Vicente A. Rivers do not rise with first rainfall;/flow– no flood plain water storage o Failure often results in disaster Malibu Canyon Dam was built in 1925 in the Santa Monica Mountains Within 13 years the reservoir/


Chapter: Freshwater at Earth’s Surface Table of Contents Section 3: WetlandsWetlands Section 1: Streams Section 2: Lakes and ReservoirsLakes and Reservoirs.

from melting ice. Natural Lakes Lakes also formed when sediment that was deposited by glaciers dammed the flow of streams. Lakes and Reservoirs 2 2 Crustal Movements Movement of Earth’s crust can create depressions that fill with water. These lakes often form along / waste. Section Check 4 4 Question 1 List some sources of nonpoint pollution. Nonpoint source pollutants can come from lawns, construction sites, roads, and farms. Answer NC: 3.07 Section Check 4 4 Question 2 Which of the following provides funds/


1 Environmental Management Module V. Environmental Issues related to Mega Hydroelectric Projects- Dams, Resettlement & Rehabilitation of people- Problems.

V Environmental Issues related to Mega Hydroelectric Projects- Dams, Resettlement & Rehabilitation of people- Problems Concerned DAMS Technically the term “dam” relates to the barrier constructed across a stream, valley or similar natural depression /Earths Rotation NASA geophysicist Dr. Benjamin Fong Chao have found evidence that large dams cause changes to the earths rotation, because of the shift of water weight from oceans to reservoirs. Because of the number of dams which have been built, the Earths/


a many-sided element The first living organisms appeared on the Earth about four billion years ago. They lived in water which protected them from the.

for life. Without it, life couldn‘t exist. It couldn’t exist on the Earth and anywhere in the space. Therefore water is considered an essential requirement of life. Water/electric ray give electric shock? Some Water Animals Turbine is an equipment, which is constructed for effective transposition of the kinetic energy, which is supplied either by steam or /well as sport centres. The lake is suitable for yachting and windsurfing. The dam is an important recreation centre of Brno city. That is why there are /


Composed by Dr. M A Islam EEE, IIUC. In the last 100 years, the Earth warmed up by ~1° C 100 years is nothing by geological time scales! M A Islam, EEE,

, etc. Japan, Iceland,New Zealand big users of geothermal. M A Islam, EEE, IIUC Although hot areas near surface are limited, the earth is hot everywhere if you go down far enough. M A Islam, EEE, IIUC Bright idea!? – drill deep enough to find heat. /is utilizing never runs dry. o The power plants, once in place, do not create any waste byproducts in their conversion. o Dams constructed can also shut their gates and conserve the water for use when power is in higher demand. o Location = unused rivers are /


4 Chapter 4 Earth ’ s Resources. Renewable and Nonrenewable Resources 4.1 Energy and Mineral Resources  Renewable resources can be replenished over fairly.

the World’s Largest Electrical Geothermal Facility Tidal Power 4.2 Alternate Energy Sources  Tidal power is harnessed by constructing a dam across the mouth of a bay or an estuary in coastal areas.  The strong in-and-out flow of tidal water/  Water pollution can lead to birth defects, cancer, diseases, kill aquatic organisms and disrupt ecosystems Major Types of Water Pollution Earth’s Blanket of Air 4.3 Water, Air, and Land Resources The increase of carbon dioxide in the atmosphere has altered the /


Dams in Developing Nations. Introduction Definition: structure built across a stream, river, or estuary to retain water (or debris)

dissolved oxygen levels downstream Reduced flooding downstream = fertilization processes Increase in mosquitoes = increase in malaria Brazil - Tucuruí Dam Effects on Ecosystems –Fisheries Initially anticipated a high mortality rate during & after dam construction Actual rates much higher due to low D.O. & nutrient levels Brazil - Tucuruí Dam Effects on Ecosystems –Terrestrial Impacts Submersion of 2,850 km 2 of land including large areas of rainforest/


The Watershed Concept. Water reaches the earth’s surface as rain and snow. A portion of the water falling on land seeps into the soil or flows over the.

The spillway allows high flows to be released without damaging the dam. A properly designed dam system ‘smoothes out’ the hydrograph and keeps river flow at a constant and safe level. Dams can be constructed with ‘ladders’ to help migrating fish pass the barrier. /the use of docks and can make navigation hazardous. Emerging Issue: Water Availability Water is not distributed evenly on the earth. This NASA image of plant growth in North America highlights water-rich regions in dark green and water poor areas /


Past Dam Failures with Modes of Failure

2006 Kauai, Hawaii Lessons Learned Comprehending geology - conditions Design - state of the practice? Construction practices Non-engineered alterations Operations, monitoring and Inspections Two Historical Failures Johnstown (South Fork) 1889 Saint Francis 1928 South Fork Dam Lives Lost: 2,209 Type: Embankment (earth and puddle) 10 miles SE Johnstown, PA Constructed: 1840 - 1853 Height 72 feet Storage 15,000 acre-ft Date of Failure: May/


  Natural Resources - resources that Earth provides. Ex. Air, water and land, all living things, rocks and minerals. Natural resources are changed through.

sand, silt, clay and gravel.  Slabs of Bedrock are cut from quarries and used in construction. Bed Rock   Aggregates - mixture of gravel, sand and crushed stone. Used for / and nausea. Largest air Pollution Source –U.S.   Human activities are disrupting Earth’s delicate balance.  Human burn fossil fuels to produce electricity and burn forests to /com%2Fwatch%3Fv%3Dn4o8NISa4Hs&tit=The+sto ry+of+Hoover+Dam&c=0&sigr=11ajnr9vj&fr=yfp-t- 701&tt=b Hover Dam StoryStory    Romans built the first to transport/


Should the Belo Monte Dam be built in Para, Brazil?

this will affect people and animals? Dam builders to tribes: why should we stop the construction if it creates and build the economy? Dam builders to AW: how would you like to get energy without building the dam? Dam builders to celeb: how do want to make movies without energy Tribes to miners: dont you want to sustain the earth so the next generation can see/


THEMATIC SLIDES. WATER AND LAKES Lake Chad, Nigeria, Niger, Chad, Cameroon Challawa Gorge Dam, Nigeria Lake Nakuru, Kenya Lake Victoria, Uganda Lesotho.

of some of the Marshlands in recent years Changes due to Three Gorges Dam construction, China Changes due to the construction of the dam 1987: Nature of the river and surrounding landscape before the dam 2004: The enormous dam is clearly visible Changes due to Atatürk Dam, Turkey Transformation of the region around the dam is strikingly apparent in these images The right-hand corner of the/


Introduction About Dams Why Were Dams Built? Conclusion Jesse Hagen  Environmental Studies  University of Wisconsin-Eau Claire  Roughly 75,000 large.

centralized, large-scale infrastructure and centralized water management systems, which was focused on constructing dams and drilling deeper wells during the 20 th century. The soft path is a demand-side management which/ of Dam Removal.” The Encyclopedia of Earth. Boston University, 22 Feb. 2012. Web. 7 Apr. 2014. Dam Removal Success Stories: Restoring Rivers Through Selective Removal of Dams That Don’t Make Sense. Friends of the Earth, American Rivers, and Trout Unlimited, 1999. Print. “Dams and/


Political Ecology of Large Dams Class #3 December 12, 2012 Bill Derman.

Europe) river discharge is regulated or controlled by dams. The very nature of the circulation of water on earth, in other words, has to be described in social as well as hydrological terms. It is a hydrosocial cycle. Importance of control the basis of much development. Issues in Large Dams Rationale for the construction of large dams: narratives, sciences, power. Hard to break the narrative/


Controlling Constructive and Destructive Forces c. Relate the role of technology and human intervention in the control of constructive and destructive.

used tools to monitor movement in the Earths crust. A seismograph records movements in Earths crust. The data helps them identify places that are most likely to be affected by earthquakes. It also helps engineers determine which materials and construction designs are best able to resist /levee is a structure designed to prevent or control flooding. They are designed to control the flow of water. Unlike dams, they do not block a river. Instead they make the sides of the river taller to prevent flood damage to/


1 Dams in Saudi Arabia: Types and Functions Faisal Fahad Al Harbi Majid Mufleh Al Motairi Hamad Al Mzroui Mulfi Mshej Al Otaibi Civil and Environmental.

(storage, diversion, detention), design (gravity, arch, embankment, earth, rockfill), or construction materials (rigid, buttress, steel, non-rigid). 5 Description (Cont.) Dams Concrete Dams GravityArchButtressFill DamsRock F DEarth F D 6 7 Observations There are more than 230 dams in Kingdom. The following are examples of some dams in Saudi Arabia. 8 Earth dam during the construction 9 Arch Dam Gravity Dam 10 Ghat dam during rehabilitation Majmaah Dam 11 Thanks for your attentions


Sculpting the Earth’s Surface Surface Water &Groundwater.

Sculpting the Earth’s Surface Surface Water &Groundwater Floods  The Worst Geological Hazard –They are the most costly in terms of life, property, / their responsibility –The LA County Flood Control District first formed in 1915 Flood Control Problems In Southern California  Uncontrolled Mountain Runoff –Construction of flood control dams within the mountain ranges  Dams are designed to take instant peak water flow  They conserve storm water for public use Flood Control Problems In Southern California  /


Three Gorges Project, China Three Gorges Project, China This hydroelectric dam is the world’s biggest dam, producing 22,500MWh of earth-friendly electricity.

dam is the world’s biggest dam, producing 22,500MWh of earth-friendly electricity. However the 39.3km 3 dam has also been mired in controversy from the outset, causing the displacement of over 1.2 million people and untold environmental damage. Experts have also warned that the Three Gorges dam/capacity of 2.8 million kilowatts... Located near Las Vegas, Nevada, spans the Colorado River Hoover Dam Constructed in the 1930s, the concrete arch- gravity structure was intended to prevent flooding as well as /


CE 4745: Landslides, Slope Stability and Earth Retaining Structures

the stiffness of the wall: rigid or flexible. Sheet pile Drainage pipe (Cheifetz 2002) Flooding Protection Dams and reservoirs (US Society on Dams 2002) A dam is built to control water. Dams are made from earth, rocks or concrete. Dams are usually constructed on rivers to store water in a reservoir. Dams help people have water to drink and provide water for industry, irrigation, fishing and recreation, hydroelectric/


ESS 202. This lecture Dams Buildings Proper response to a quake Real odds in a quake.

to 1963 Baldwin Hills Dam failure Breach in dam Keller, 3-11 View of dam after failure Keller, 3-11 Downstream Yanev 75 Map of flood Keller, 3-11 Near collapse of dam Lower Van Norman Dam in San Fernando earthquake of 1971 –Constructed in 1915, reinforced several/ dampers installed in the tower 30,000 cubic yards of concrete 16 million pounds of reinforcing steel 35,000 cubic yards of earth excavated $300 million City Hall 1853 - 1883 Base isolators In action - 21” of motion Viscous dampers The “moat” /


General Geology Acknowledging Dr.V.Nagarajan. UNIT I General Geology CONTENTS Geology in Civil Engineering Branches of geology, Earth Structures and composition,

of continental lithosphere meet (intervening ocean becomes completely closed) -continental lithosphere can’t be subducted, so basically shortens -Earth’s highest mountain belts produced in this way (e.g. Himalayas) UNIT I General Geology 32 Model for / tunnelling and dam projects, construction of roads and in determining the stability of cuts and slopes. 4.Foundation problems of dams bridges and buildings are directly related with geology. The location of bridge, tunnel and dam construction site are decided/


Constructive & Destructive Forces. EQ: What is the difference between a Constructive Force and a Destructive Force?

Landslides –Volcanoes- Tsunami Earthquakes: Shaking that results from the movement of rock (tectonic plates) beneath Earth’s surface Destructive force or Constructive force Most occur because of moving crust Earthquakes causes vibration across the ground, sending shock waves that /earthquake and a large one means a large earthquake. Flood Control The U.S. Army Corps of Engineers began constructing dams in Georgia for navigation and flood control in the 1940s and 1950s under the Flood Control Act of 1944 and/


Water §Importance and unique properties. Features §covers 71% of the Earth’s surface §regulates Earth’s climate §dilutes wastes §sculpts earth’s surface,

reservoirs of groundwater §consolidated forms §solid rock with groundwater in cracks §unconsolidated forms §sand,gravel,loose earth §amount of water depends on packing Cone of depression §withdrawal rate of aquifer exceed natural recharge rate,/in water from another watershed §Developing - must settle where water is available, borrow money to build dams and reservoirs Constructing dams/reservoirs §water stored in large reservoirs §used for hydroelectric power, irrigate land downstream, control flooding, /


School of Earth and Environment FACULTY OF ENVIRONMENT Contemporary Chinese Environmental Debates and Policy: Water Resource Management Issues Environment.

,000 people forced to relocate Three Routes under construction Eastern – due for completion in 2007 Central – due for completion in 2030 Western – due for completion in 2050 School of Earth and Environment FACULTY OF ENVIRONMENT School of Earth and Environment FACULTY OF ENVIRONMENT School of Earth and Environment FACULTY OF ENVIRONMENT The Three Gorges Dam Specifications of the dam 400 miles / 640km long Capacity - 39.3bn/


GSC 1620 Chapter 6 Streams and Flooding. Running Water Running water performs much of the erosional activity of the Earth’s surface and therefore significantly.

Be able to tell me why Flood Prevention/Control Measures Water retention/diversion basins Levees Stream channelization Dams Restrictive zoning (see slides) Least damaging to stream ecosystem Effect of subsurface drainage increases flood potential Flood Prevention/Control Measures Levees – raised, artificial embankments; often constructed of compacted earth, rock, poured concrete or sandbags Problems arise (see slides) if the levees become breached (e.g/


A. Hydrologic cycle o The hydrologic cycle is a summary of the circulation of Earth’s water supply o Processes involved in the hydrologic cycle o Precipitation.

Evaporation o Infiltration o Runoff o Transpiration The hydrologic cycle Sources of Earth’s water The Three Fates of Precipitation— Where does rain go?/Less infiltration o More runoff o More flooding o Specific causes: o Deforestation o Construction and paving o Channelization Rivers do not rise with first rainfall; the thirsty ground/ by eliminating flood plain water storage o Failure often results in disaster Malibu Canyon Dam was built in 1925 in the Santa Monica Mountains Within 13 years the reservoir was/


Chapter 15- Running Water RUNNING WATER Earth is the water planet, unique in our Solar System: -97% of water on Earth is in the oceans -2% is frozen in.

Rain, washed to ocean thru rivers…process repeats… Chp15: Running Water Relative amounts of water on Earth Running Water is the most important geologic agent modifying the Earth’s surface. Exception- glaciers and deserts. 1. sheet flow vs channelized flow: -sheet flow: not/and yield a concave profile approximating a graded profile. c. Actual measured profiles of 3 rivers. VE=275x a. Constructing a dam and reservoir create a local base level. b. Stream will adjust to new base level if lake is drained. /


Dam Safety Program March 2011 Dam Safety Program March 2011.

 Phase II – Final Design in progress  Buckeye FRS No. 1 Rehab– Final Design in progress  Powerline FRS, Vineyard Road FRS and Rittenhouse FRS – Planning in Progress – FUTURE DESIGN CONTRACT  McMicken Dam – District planning complete, seeking Corps funding – FUTURE DESIGN CONTRACT Dam Modifications Projects Status  Powerline FRS Earth Fissure Mitigation – Construction March 2011 Construction March 2011  Saddleback FRS Filter Repair – Final Design in Progress  Cave Buttes/


Kelly Barnes Dam Failure

1937 Toccoa Falls Bible Institute built an earth dam over the crib dam for a more reliable power source After WWII, earth dam was again raised Over time additional pipes/penstocks were installed in the dam and down the valley to the /second floor Likely Cross Section Dam contained remnants of old construction – crib dam Pipes for penstocks embedded in dam – some dating to early 1900’s Dam section was homogeneous – no filter zones Slopes were irregular Tree roots penetrated dam Breach looking Upstream Photos /


The Failure of Teton Dam

the failure Engineering factors behind the failure The future of the Teton Dam site Conclusion Introduction Earth dam located between Fremont and Madison Counties on the Teton River, Idaho, USA Dam dimensions – 940m long 93m high and 540m wide at the base Construction began in June 1972 and was completed in November 1975 Construction cost $49,000,000 Intended to create the Teton reservoir with a/


Ads by Google