The major types of variable displacement pumps are as follows: 1. Centrifugal Pumps 2. Jet Pumps 3. Air-Lift Pumps. Type # 1. Centrifugal Pumps: Centrifugal pumps are the most popular types of variable displacement pumps. They are capable of delivering large volumes of water against high as well as low heads with good efficiency. Besides, these pumps are relatively simple [...]
Any given volume, V of soil (Fig. 3.1) consists of: (i) Volume of solids Vs (ii) Volume of liquid (water) Vw, and (iii) Volume of gas (air) Va The porosity n, the volumetric moisture content w and the saturation s are defined as N = Vv/V Obviously, w = s.n. Further, if the weight of water in a wet soil [...]
After reading this article you will learn about the delivery of water to farms through rotation delivery or warabandi system. In the rotation delivery system, water is delivered from a watercourse to various farms situated along the watercourse according to a pre-decided time roster. Accordingly, this delivery system is also known as warabandi system, which can be defined as an [...]