A spillway is a crucial component of a dam that manages overflow water, with various types including drop, ogee, chute, shaft, siphon, and side channel spillways. Each type serves different functions like controlling discharge, preventing overtopping, and protecting against erosion. Overall, the spillway ensures safe water management from the reservoir to downstream.

1. TOPIC
SPILLWAY

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

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