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II. Dams

C. Spillways

1. Purpose

2. Types

3. Discharge

Characteristics

D. Energy

Dissipation

II.C.1: Purposes of Spillways

Used to pass excess

flow in a controlled

fashion

Two main types: Unregulated

Regulated

Control Section

Discharge ChannelTerminal Structure

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II.C.2: Types of Spillways

Free Overflow

Ogee

Side Channel

Labyrinth

Chute

Baffled Chute

Stepped

Drop Inlet Controlled Crest Ogee Crest Spillways

Folsom Dam, California

Wadsworth Dam, Mantua Creek

Free Overfall

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Lake Centerton Dam, Muddy Run

Free Overfall

Chief Joseph Dam, Columbia River, WA

Ogee Crest Concrete

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Chief Joseph Dam

Columbia River, WA

Regulated Crest Tainter Gate

Boonton Dam, Parsippany

Troy Hills, NJ

120 feet high

Ogee Crest

Masonry

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Lake Kandle Dam, Sewell, NJ

Drop Inlet Spillway

Union City Dam, PA

Side Channel Spillway

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Side Channel Spillway

Oak Ridge Reservoir Dam, WA Twp, Mercer County, NJ

Side Channel Spillway (?)

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Labyrinth

Spillways

Labyrinth

Spillways

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Chute

Spillway

Baffled Chute Spillway

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Good energy dissipation

Good aeration

Stepped

Spillway

Concrete Ogee Crest Spillways& Tainter (Radial) Gates

Spillways -

Regulated

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Vertical Lift Gates

Eildon Dam,

AustraliaThomas, Henry H.

The Engineering of Large Dams

Spillways - Regulated

General Discharge Relationship (US Bureau of Reclamation)

Ogee Spillway

Spillways - Unregulated

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General Discharge Relationship

Gated Spillway

(US Bureau of Reclamation)

Spillways - Regulated

Assunpink Site No. 6 Dam, Washington Township, NJ

12,653 acre-feet of storage

Energy Dissipaters

Baffle Blocks