Why are the walls of a dam thicker at the base?
The pressure applied to walls of the dam will be a function of the amount of water that is over that particular point on the wall. So water pressure is very large at the bottom due to its large depth. That’s why dams are constructed thicker at their bottoms than at their tops.
Why the wall of Dam is broader from base and thin from upper part?
The reason is that the pressure exerted by a liquid increases with its depth. Thus, as the depth increases, more and more pressure is exerted by water on the wall of the dam. A thicker wall is required to withstand greater pressure, therefore, the thickness of the dam increases towards the bottom.
Why the base of dam is broader than the top explain?
A dam has broader walls at the bottom than at the top because the pressure exerted by liquid increases with its depth, and at any point at a particular depth liquid pressure is the same in all directions. Hence a thick wall is constructed at the bottom of the dam to withstand greater pressure.
Why the base of house is made wider?
Explanation: The foundation of the building is generally built wider and broader as compared to its walls so that the building does not sink into the ground and is also capable to handle the pressure of the entire building. With the wide base as the foundation, large buildings can prevent high pressure.
Why are dams provided with broad base?
Dams have broad walls at the base to withstand the high pressure exerted by the water. The pressure in liquids increases with the increase in the depth of water.
Why is it better to use a school bag that has broad straps?
Broad shoulder straps provide larger surface area. So, the pressure exerted by the bag on the shoulder is less and carrying the bad is easier.
Why is the bottom part of the foundation of a building made wider class 8?
Since buildings are massive structures which exert high pressure on the ground and likely to sink so to avoid sinking their foundations are made wide so that pressure on the ground will be decreased.
Why are the footings wider than the foundation wall of a basement?
The hole must be bigger than the area of the foundation in order to accommodate the workers who will be pouring your foundation. The footings are created using forms, place on undisturbed ground. The footing is always wider than the concrete walls.
Why do the building foundations have a large horizontal area of contact with the ground?
Building foundations have a large horizontal area of contact with the ground . This would reduce the pressure being exerted to be smaller and thus make the building more stable (prevent the entire structure from sinking).
Why the base of multistorey buildings kept wide?
The foundations of high rise building are kept wide so that they exert less pressure on the ground and prevent the building from sinking into the ground.
Why buildings and dams have wide foundations?
The foundations of buildings and dams are laid on a large area of ground so that the weight of the building or dam produces less pressure on the ground and they may not sink into the ground.
What would you prefer a multi story building to have a wide foundation or a narrow one Why?
Multi storey building must prefer a wide foundation as it lowers the pressure hence it would be safe. as shown in the expression that pressure and area are in inverse relation to each other hence smaller is the area more pressure will be exerted or vice- versa.
How do I know my footing size?
How to Calculate Footing Size
- Determine the width and length of the cement slab in inches.
- Divide the width by 12 to convert it to feet.
- Divide the length by 12 to convert it to feet.
- Determine the depth or thickness that is required for the footing in inches.
- Multiply the width by the length and then by the depth.
How deep should footings be for a 6 foot wall?
All footings should be a minimum of 150mm (6″) in depth, with the bottom 350 – 400mm (14-16″) below ground level on most soils. For clay soil however, thicker and deeper footings should be used.
What happens after footings are poured?
If you’re building a house with a slab foundation, holes are dug for the footings that provide support, then forms are added and the concrete for the footings is poured. After the foundation cures, a waterproof coating is applied to the outside, drains are installed, and sewer and plumbing lines are added.