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Which type of hall can be generally used for moderate discharge of 40-60 cumes and low fall heights of 1m to 1.5 m?
- a)Vertical drop fall
- b)Ogee fall
- c)Glacis fall
- d)Baffle fall
Correct answer is option 'C'. Can you explain this answer?
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Which type of hall can be generally used for moderate discharge of 40...
Option (c) is the correct Ogee fall that has convex and concave curves. Due to smooth transition, the kinetic energy of the flow is not at all dissipated. This causes erosion of downstream beds and banks. It is not used these days. Well (Cylindrical or siphon well) fall is necessary in the case of falls greater than 1.8m and for discharges greater than 0.29m3/s. Thus it is used for larger drop and smaller discharges. Simple vertical drop type and Sarda type falls are used for small discharges which vary over a wide range. They are suitable for discharges upto 15 cumecs and drops upto 1.5m Straight Glacis falls are designed such that hydraulic jump occurs on the glacis, causing sufficient energy dissipation. They can be adopted suitably for discharges upto 60 comecs and drop upto 1.5m and can be even flamed. Baffle fall (English fall) may be used for all discharges when the drop is more than 1.5m.
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Which type of hall can be generally used for moderate discharge of 40...
Glacis Fall
A glacis fall is the type of fall that can be generally used for a moderate discharge of 40-60 cumes and low fall heights of 1m to 1.5m. Let's discuss why this is the correct option:
What is a Glacis Fall?
A glacis fall is a type of hydraulic structure used in water conveyance systems. It consists of a sloping surface that allows water to flow smoothly from a higher level to a lower level. The sloping surface is designed to minimize energy losses and maintain a stable flow.
Characteristics of a Glacis Fall
Glacis falls are suitable for moderate discharges and low fall heights due to their specific characteristics:
- Smooth Flow: The sloping surface of the glacis fall ensures a smooth flow of water, minimizing energy losses.
- Low Impact: The low fall height of 1m to 1.5m reduces the impact of the falling water, preventing erosion and other potential damages.
- Controlled Discharge: Glacis falls are designed to handle moderate discharges of 40-60 cumes, providing efficient water conveyance.
- Stable Flow: The design of a glacis fall helps maintain a stable flow, preventing turbulence and ensuring a controlled water movement.
Advantages of Glacis Falls
Glacis falls offer several advantages in water conveyance systems:
- Energy Efficiency: The smooth flow and controlled discharge of a glacis fall minimize energy losses, making it an energy-efficient solution.
- Reduced Maintenance: Due to the low impact and stable flow, glacis falls require less maintenance compared to other types of falls.
- Cost-effective: Glacis falls are relatively easy to construct and cost-effective, making them a preferred choice for moderate discharge and low fall height scenarios.
- Environmental Benefits: The stable flow and reduced erosion potential of a glacis fall have positive environmental impacts, minimizing disturbances to the surrounding ecosystem.
Overall, a glacis fall is the appropriate option for handling a moderate discharge of 40-60 cumes and low fall heights of 1m to 1.5m due to its smooth flow, low impact, and controlled discharge characteristics.
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Which type of hall can be generally used for moderate discharge of 40-60 cumes and low fall heights of 1m to 1.5 m?a)Vertical drop fallb)Ogee fallc)Glacis falld)Baffle fallCorrect answer is option 'C'. Can you explain this answer?
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