Civil Engineering - Irrigation - Discussion

1. 

Borrow pits should preferably be located in

[A]. field on the left side of the canal
[B]. field on the right side of the canal
[C]. fields on both sides of the canal
[D]. central half width of the section of the canal.

Answer: Option D

Explanation:

No answer description available for this question.

Savitha said: (May 24, 2013)  
Fields on both sides of the canal what happens?

Aniket said: (Sep 6, 2013)  
If we provide borrow pit central half width of the section of the canal, then the water coming from the ground water table meets into the canal.

Anand said: (May 2, 2014)  
Borrow pits are taken for knowing the liquidity, Plasticity, Permeability, Swell Index and Swell Pressure of Soil.

These are the basic parameters for excavation of canals.

Center half of the canal section may be preferable for borrow pits.

Khalid Bashir said: (Oct 13, 2015)  
Need more discussion.

Muhammad Bilal said: (Mar 19, 2016)  
Please alert me in this question.

Sachin Kumar said: (Jul 4, 2016)  
In construction and civil engineering, a borrow pit, also known as a sand box, is an area where material (usually soil, gravel or sand) has been dug for use at another location.

Nikhil said: (Jul 21, 2016)  
If we provide borrow pits at the sides of the canal, then WE can't imagine how much water level is around borrowed pits. It means we determine max.

Omkar Bhojane said: (Jul 27, 2016)  
Borrow pits: When earthwork in filling exceeds the earthwork in excavation, the earth has to be brought from somewhere. The pits, which are dug for bringing earth, are known as borrow pits.

If such pits are excavated outside the channel, they are known as external borrow pits, and if they are excavated somewhere within the channel, they are known as internal borrow pits. It is a very costly affair to bring soil from distances. Even in the nearby areas, these pits may cause mosquito nuisance due to a collection of rain water in these pits, and hence, external borrow pits are not preferred.

Basic Concept Of Borrow Pits And It's Design Requirement.

Design Requirements:

The borrow pits should start from a point at a distance more than 5 m from the toe for small channels, and 10 m for large channels.

The width of these pits b should be less than half the width of the canal B, and should be dug in the entire.

The depth of these pits should be equal to or less than 1 m.

Longitudinally, these pits should not run continuous, but a minimum space of L/2 should be left between two consecutive pits, (where L is the length of one pits).

Lopamudra said: (Dec 13, 2016)  
Thanks @Omkar.

Ravishankar said: (Mar 13, 2017)  
Thanks @Omkar.

Bhawana Dubey said: (Sep 13, 2017)  
What is water table?

Ebadullah Mohammadi said: (Oct 24, 2017)  
@Bhawana Dubey.

What is water table?

The level below which the ground is saturated with water.

The Water table, also called Groundwater Table, upper level of an underground surface in which the soil or rocks are permanently saturated with water. The water table separates the groundwater zone that lies below it from the capillary fringe, or zone of aeration, that lies above it.

Agastya Pavan said: (Apr 2, 2018)  
Borrow Pits serves the purpose of depositing silt i.e. running with water. So it is one of the purposes of borrow pit.

Behara Srikanth said: (Aug 6, 2020)  
Good explanation. Thanks all.

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