module-i elements of dam engineering hoover dam, usa colorado river three gorges dam china, yangtze...
TRANSCRIPT
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Module-IElements of Dam Engineering
Hoover Dam, USAColorado river
Three Gorges DamChina, Yangtze river
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Elements of Dam Engineering
Classification of Dam -Earth Dam -Concrete or Gravity Dam - Gravity - Arch dam - Buttress dam - Factors for site sel. Dam - Factor for sel. Type of dam
Spillway -Types - Spillway gates
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Dam:A dam is an impervious structure constructed across river and which store the water at U/S. OrA structure built across a River, Stream, and Tributaries for storing water at its upstream side and create a reservoir by help of major axis is called hydraulic structure for Storage such as Dam.
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Classification of Dam
1)Based on their use i) Storage Dam ii) Diversion Dam iii) Detention Dam
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2) Based on Hydraulic Design i) Over Flow Dam ii) Non-Over Flow Dam
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3) Based on Structural Design1)Gravity Dam2) Arch Dam3)Buttress Dam4)Embankment Dam
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4) Based on the material used i) Rigid Dam ii) Non- Rigid DAM
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Concrete Dam or Gravity DamIt is categorized as rigid dam because it made by the rigid material
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Embankment DamIt is most ancient type of dams that can be built by naturally available materials.
1) Earth Dam
i) Homogeneous type
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ii) Zoned type
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ii) Diaphragm type
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2) Rock fill Dam
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3) Combined Earth & Rock fill Dam
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Concrete Dam or Gravity DamIt is categorized as rigid dam because it made by the rigid material
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Advantages of Gravity Dam:1) Strong & Stable2) Overflow spillway, Pass flood3) Any height4) Not sudden failure5) Suitable at heavy downpore6) Less maintenance cost
Disadvantages of Gravity Dam:1) Sound rock foundation2) Higher cost3) Skill labour & Mechanics4) Diff. to rise the height latter5) More time to construction
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Arch DamIt is curved concrete dam
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Advantages of Arc Dam:1) Suitable deep gorges & Length small2) Built on moderate/weak foundation3) Thickness less than height4) Less cost compare gravity dam
Disadvantages of Arc Dam:1) Skill labour & Mechanics cost2) Construction time large3) Strong abutment4) Not Suit if solid rock not available
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Buttress DamButtress dam consists of a continuous inclined U/S face supported by D/S buttress at regular interval
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Advantages of Buttress Dam:1) Less materials2) Week foundation3) Buttress support again overturning & sliding
Disadvantages of Buttress Dam:1) More form work2) Constant maintenance and supervision3) Life less
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Selection of site for a Dam1) Foundation2) Topography3) Reservoir4) Catchment Area5) Spillway6) Construction Material7) Communication8) Environmental Condition
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Factor governing the selection of type of dam1) Topography - V Shape - U Shape2) Geology and Foundation Condition -Solid Rock -Gravel - Silt & Fine Sand - Clay - Non-Uniform3) Availability of materials for Construction4) Spillway size and location5) Roadway6)Length and height of dam7) Life of the dam8) Earthquake
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SpillwaySpillways are important auxiliary works of dam, provided to dispose the surplus water from the dam which can not store in the dam otherwise it may overtroped
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Location of SpillwayA spillway is located either within the body or totally away from the main dam as independent structure
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Requirements of a Spillway1) Sufficient capacity2) Safe disposal of water3) Hydraulically and structure sufficient4) Hard bound surface5) Spillway should accompanied by energy dissipation work
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Component part of Spillway1) Control Structure2) Discharge Channel3) Energy Dissipaters4) Entrance and outlet channels
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Types of Spillway1) Free overflow and straight drop spillway
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2) Ogee or overflow spillway
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3) Chute or Open channel or through Spillway
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4) Side channel Spillway
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5) Siphon spillway
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Energy Dissipation Below Spillway
1) Hydraulic Jump
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2) Ski jump bucket
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Spillway Crest Gates
1) Dropping Shutters or Flash boards
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2) Radial gauge or Tainter gates
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3) Drum gate
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Prepared by, Dr. Dhruvesh
Patel
Prepared by, Dr. Dhruvesh
Patel
Source: www.google.comSincere thanks to Mahajan Publishing house for photographs and supplement materials.
www.drdhruveshpatel.com
www.drdhruveshpatel.com