# Height of Collimation and Rise and Fall Method | Methods of Levelling

#### Methods of Levelling | Guide to Surveying and Levelling

In this article, we will discuss two important methods of Levelling. We will also study these Methods with the help of Numerical Examples in our successive articles.

#### There are two Methods of Levelling:

1. Height of Collimation Method
2. Rise and Fall Method

#### Height of Collimation Method

This method is simple and easy.

Reduction of levels is easy.

Visualization is not necessary regarding the nature of the ground.

There is no check for intermediate sight readings;

This method is generally used where more number of readings can be taken with less number of change points for constructional work and profile levellings.

#### Rise and Fall Method

This method is complicated and is not easy to carry out.

Reduction of levels takes more time.

Visualization is necessary regarding the nature of the ground.

Complete check is there for all readings.

This method is preferable for check levelling where number of change points are more.

### 4 thoughts on “Height of Collimation and Rise and Fall Method | Methods of Levelling”

1. If collimation method can be used where more number of readings can be taken, then how possible will it be with less number of change points for construction work?

• A method that can give you more number of readings is a preferred one because the accuracy rate is higher.

2. When working out the collimation method in a level book, what is the formula used to get the answer

3. Your question is just to general.but if it’s the height of collimation you want to calculate then it’s
Bs+RL=HOC.
RL=HOC-Bs