The important methods that are available for drilling tubewells are as follows: 1. Percussion Drilling (Also Known as Cable Tool Method), further classified as: (i) Hand boring by rope or rod, and (ii) Mechanical boring with power rigs. 2. Rotary Drilling, further classified as: (i) Direct circulation hydraulic rotary, (ii) Reverse circulation hydraulic rotary, and (iii) Rotary-air percussion drilling. 3. [...]
In this article we will discuss about the formation of cavity in wells with the help of a suitable diagram. When the water is not withdrawn from the well, the water level inside the well is equal to the static water table outside the well. But when the water is being drawn from the well at some constant rate, the [...]
The measurement of an open well yield can be determined by the following method: 1. Actual Pumping Method 2. By Theoretical Calculations. 1. Actual Pumping Method: The yield of well is determined by pumping out water from it. In this method first the water is withdrawn from the well at very high rate, then the rate of pumping is reduced [...]
In this article we will discuss about the design of open wells with the help of suitable diagrams. 'Draw Wells' or Open Wells are shallow wells which are usually confined to soft ground, sand and gravel. The diameter of these wells may be between 1 m to 4 m and depth may be up to 20 metres depending on the [...]