After reading this article you will learn about the open wells and tube wells with the help of a diagram. Water wells can be classified either open wells or tube wells. Open wells have relatively large diameter (generally 1 to 5 m) and low yields (generally less than 30 m3/hr), and are not very deep (generally 3 to 15 m). [...]
The procedures usually adopted for well development are as follows: 1. Over-pumping 2. Backwashing 3. Mechanical surging 4. Air surging and pumping 5. High-velocity jetting 6. High-velocity water jetting combined with simultaneous pumping. Procedure # 1. Over-Pumping: In the over pumping method, the well is pumped at a discharge rate higher than the discharge rate of the well during its [...]
Following four types are the most widely used recording rain gauges: Type # 1. Symon’s Rain Gauge: The Indian Meteorological Department has adopted Symon's rain gauge (Fig. 2.3). A glass bottle and funnel with brass rim are put in a metallic cylinder such that the top of the cylinder is 30.5 cm above the ground level. Rain water falls into [...]