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Questions and Answers
What is the primary purpose of a spillway in a hydraulic design?
What is the primary consideration for designing the terminal structure of a spillway?
Why should the designer maintain close liaison with other disciplines during the design process?
What is the minimum value used for terminal structure design discharge?
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Why should a powerhouse not be considered as a reliable discharge facility?
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What is the primary consideration for accepting other damages during flood discharges?
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What is the primary factor that influences the hydraulic design of the spillway?
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What is the primary purpose of the spillway design flood?
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Study Notes
Spillway Functions and Design Considerations
- The hydraulic design of the spillway is influenced by project functions and their social, environmental, and economic effects.
- Optimization of the hydraulic design and operation requires awareness of data reliability, accuracy, sensitivity, and possible variances.
Spillway Function
- The basic purpose of the spillway is to control flow and provide conveyance from reservoir to tailwater for all flood discharges up to the spillway design flood (SDF).
- The spillway can be used for flood-control regulation, either alone or in combination with flood-control sluices or outlet works.
Terminal Structure and Energy Dissipation
- A terminal structure is usually provided at the downstream end of the spillway for energy dissipation.
- The degree of energy dissipation depends on the anticipated use of the spillway and the extent of damage that will occur if the terminal structure capacity is exceeded.
- The standard project flood is a minimum value used for terminal structure design discharge.
Damage Acceptance and Economic Evaluation
- Damage to the dam structure that compromises its structural integrity is not acceptable.
- Acceptance of other damages should be based on an economic evaluation of the extent of damage considering the extremely infrequent flood causing the damage.
Spillway Classification
- Spillways are classified into four separate categories, each serving satisfactorily for specific site conditions when designed for the anticipated function and discharge.
Overflow Spillway
- This type of spillway is normally used in conjunction with a concrete gravity dam.
- The overflow spillway is either gated or ungated and is an integral part of the concrete dam structure.
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Description
This quiz covers the factors influencing the hydraulic design of spillways, including project functions, environmental considerations, and data reliability. It also touches on the importance of interdisciplinary collaboration.
