TOPIC
SPILLWAY
CONTENTS
 What is spillway
 Types of Spillway
 Purpose/function of spillway
What is Spillway?
 Spillway is masonry overflow portion provided every dam . The top of spillway known as crest .
 It is very important component of a dam .
Types of spillway
1.Main or services spillway
 drop spillway
 Ogee spillway
 Chute or trough spillway
 Shaft spillway
 Siphon spillway
 Side channel spillway
2. Emergency spillway
Drop spillway
 This is simple type of spillway
 It may be constructed on small bunds on thin arch dams
 It is low weir and simple vertical fall type of structure
Ogee spillway
 It is most common type of spillway provided on gravity dam
 It is widely used in concrete masonry, arch and buttress dam
Chute or trough spillway
 A chute spillway is one which passes the surplus discharge through a steep
sloped of a channel is called as chute or trough spillway
 It is provided on earth and rockfill dams
Shaft spillway
 It is kind of funnel type of structure
 Water drops through a vertical shaft to a horizontal conduit that conveys the
water past the dam
 Also called as glory hole spillway
Siphon spillway
 It is based on principle of siphon
 When water rises over FRL then water start spilling
 There is an air vent for removing the entrapped pressure from the water
Side channel spillway
 It is used when dam is not rigid and it is undesirable to pass flood water over
the dam
 After passing crossing over the spillway rest, water flows parallel to crest
Function of spillway
 The quantity of water from upstream to downstream side of the reservoir
 To control the discharge from reservoir
 To avoid overtopping of surplus water
 To protect downstream slope from scouring erosion
THANK YOU HAVE A NICE DAYS

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what is spilways and their types with function

  • 2. CONTENTS  What is spillway  Types of Spillway  Purpose/function of spillway
  • 3. What is Spillway?  Spillway is masonry overflow portion provided every dam . The top of spillway known as crest .  It is very important component of a dam .
  • 4. Types of spillway 1.Main or services spillway  drop spillway  Ogee spillway  Chute or trough spillway  Shaft spillway  Siphon spillway  Side channel spillway 2. Emergency spillway
  • 5. Drop spillway  This is simple type of spillway  It may be constructed on small bunds on thin arch dams  It is low weir and simple vertical fall type of structure
  • 6. Ogee spillway  It is most common type of spillway provided on gravity dam  It is widely used in concrete masonry, arch and buttress dam
  • 7. Chute or trough spillway  A chute spillway is one which passes the surplus discharge through a steep sloped of a channel is called as chute or trough spillway  It is provided on earth and rockfill dams
  • 8. Shaft spillway  It is kind of funnel type of structure  Water drops through a vertical shaft to a horizontal conduit that conveys the water past the dam  Also called as glory hole spillway
  • 9. Siphon spillway  It is based on principle of siphon  When water rises over FRL then water start spilling  There is an air vent for removing the entrapped pressure from the water
  • 10. Side channel spillway  It is used when dam is not rigid and it is undesirable to pass flood water over the dam  After passing crossing over the spillway rest, water flows parallel to crest
  • 11. Function of spillway  The quantity of water from upstream to downstream side of the reservoir  To control the discharge from reservoir  To avoid overtopping of surplus water  To protect downstream slope from scouring erosion
  • 12. THANK YOU HAVE A NICE DAYS