All about civil construction knowledge- PARAM VISIONS

How to calculate slope(gradient ) in construction work? / How to calculate gradient, run & rise in civil construction?

 Let us now calculate the slope, run & rise in the 3 different drawings as shown below.

1. Slope calculation :


Given data :

Run = 15m.

Rise = 0.5m.


  Slope = [run ÷ rise]

           = [15m. ÷ 0.5m].

          = 30

So, we should provide a gradient or slope of 1: 30 


2. Run calculation:



Given data :

Slope = 1: 100

Rise = 0.5m


  Run 

      = [slope x rise]

      = [100 x 0.5]

      = 50 m.

So, we have to provide a 50m run for every 0.5m rise.


3. Rise calculation:

Given data :

Slope or gradient = 1:30

 Run = 12m.


 Rise 

       = [run ÷ slope]

       = [12m. ÷ 30]

       = 0.4m. or 400mm.

So, for a 12m run, you have to provide a 0.4m. or 400mm. rise.


4. Rise per meter calculation:


When we make roads, we cannot provide a rise for the total length as the work should be done in different phases. In such cases, we have to calculate the rise per meter run. 

Rise 

       = [ run ÷ slope]

       = [200m. ÷ 100] 

       = 2m. 

Here, 

       For 200m run,  rise = 2m

        For  1m. run,    rise =?

By cross multiplication,

[1m. × 2m.] = [rise/m. × 200]

 Rise/m. = [(1m. × 2m. ) ÷200]

             = 0.01m. or 10mm.

If you want to provide a gradient for the 20m. run of the above-given road, 

The formula

     = [rise/m. × run length]

    =  [0.01m per m. × 20m.]

    = 0.2m. or 200mm.


To go through the articles on Estimation & calculation in civil engineering, click here.




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