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 [...]
Flow of ground water through porous medium is governed by well-known Darcy's law which states that the rate of flow, Q through a saturated porous medium is: (i) Proportional to the difference in hydraulic head Ah between the two flow sections, (ii) Proportional to the area of flow cross-section A, and (iii) Inversely proportional to the length, L between the [...]
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 [...]