Low Gravity Dam and High Gravity Dam - Gravity Dams - Water Resource Engineering 2

TL;DR

This video discusses how to define and differentiate between low gravity dams and high gravity dams based on their height and the maximum compressive stresses they can withstand.

Transcript

hello students in this video we are study we are going to study how we will define or how we will distinguish the low gravity dam and high gravity dam on which basis we say that this dam is the low or the higher one in previous uh slide or in previous recording we had studied the elementary profile and practical profile so uh in the elementary prof... Read More

Key Insights

• 😲 The height of a dam is the primary factor in distinguishing between low gravity and high gravity dams.
• 😘 Low gravity dams have a height lower than the specific equation, while high gravity dams exceed that height.
• 😲 Maximum compressive stresses in a dam should not exceed the allowable stress limits of the material.
• 🚄 High gravity dams require extra slopes on both the upstream and downstream sides to prevent failure.

Questions & Answers

Q: What is the main factor used to differentiate between low gravity dams and high gravity dams?

The main factor used is the height of the dam. If the height is less than a specific equation, it is classified as a low gravity dam. If it exceeds that height, it is considered a high gravity dam.

Q: What is the equation used to calculate the height of a low gravity dam?

The equation is H = F/(γ*(G - C)+1). Here, H represents the height of the dam, F is the allowable stress, γ is the unit weight of the material, G is the specific gravity, and C is the coefficient of uplift.

Q: Why do high gravity dams require extra slopes on both the upstream and downstream sides?

High gravity dams need extra slopes to ensure that the compressive stresses remain within the allowable limits. The extra slopes help distribute the stress and prevent the dam from exceeding its maximum capacity.

Q: What are the allowable stress limits for concrete in low and high gravity dams?

The allowable stress for the compressive zone of concrete is typically around 3000 kilonewton per meter square. For tension, it is around 500 kilonewton per meter square.

Summary & Key Takeaways

• The video introduces the concept of low gravity and high gravity dams and explains the importance of distinguishing between them.

• It provides the equations and factors used to determine whether a dam is low gravity or high gravity, including the specific gravity, unit weight, and allowable stress of the dam material.

• The video discusses the implications of the height of the dam and the compressive stresses it can sustain, and how these factors affect the design and construction of the dam.