Groundwater recharge

Estimation the current rate of groundwater recharge [1] is essential for efficient groundwater resource management in arid and semi-arid zones, and is often the key to economic development. Moreover, it represents an essential component in the understanding of hydrogeologic settings for the aquifers. Many studies have been proposed to assess recharge with physical and chemical techniques, as well as with modeling [2-5]. These methods, however, are difficult to apply to regional scale studies, and

Terraced fields have existed in many ancient human civilizations for thousands of years. They are ubiquitous; from the Incas to the Chinese, even in Europe, we see terraced fields developed and used for many purposes. Most terraced fields were constructed for agriculture, but some are developed to control floods and other purposes. To this day, we still see some terraced fields around the world, which allows us to admire their natural beauty. However, while we are admiring the beauty of terraced

High Resolution Groundwater Prospect Mapping of Raichur, Karnataka Using Remote Sensing & GIS Joseph T. Koottiyaniyil1, Pankaj Dhote2 & Dr. S. K. Srivastav3 1P. G. Diploma, Water Resource Department, Indian Institute of Remote Sensing 2Scientist’SC’, Indian Institute of Remote Sensing,3Scientist’G’, Indian Institute of remote sensing, Dehradun. Abstract: Occurrence of groundwater in the basement complex of Raichur, Karnataka is controlled by secondary porosity developed through weathering and

south to north groundwater flow and replenishment from the recharge areas in the south. The NE-SW trending Pelusium mega shear cuts the Precambrian rocks and continues upward in the sedimentary cover; it formed deep structural controlled basins along its zone, which were filled by high thick sediments of relatively high hydraulic conductivities extending from the Kufra Basin in Libya and Chad to the northern part of Dakhla Basin in Egypt. This zone could provide a preferred groundwater flow pathway

ARTIFICIAL RECHARGE IN GUJARAT” ABSTRACT Though groundwater is an important source of irrigation in India, its availability is non-uniform in space and time. In Saurashtra region of Gujarat state, problem of groundwater depletion has arisen due to high withdrawal than rate of replenishment of groundwater. This also resulted in seawater intrusion in coastal areas at very high rate. The water harvesting and groundwater recharge activities played an important role in increasing the groundwater resource

water will be exhausted in the Kansas High Plains aquifer in 50 years” (Kansas Water Resources Board). Groundwater is available to help support agricultural production and is a reliable guarantee, but with continual depletion of the aquifers there would be a threat to the future of sustainable water resources. The High Plains aquifer provides the United States with 30 percent of irrigated groundwater, where the high plains of Kansas’s aquifers occupy an important share. Kansas State University, Department

user of groundwater for irrigation in the world. India has around 432 cubic kilometres of annual replenishable groundwater re-sources. With a net annual groundwater availability of 399 cubic kilometres, the net withdrawals in 2004 amounted to 58% of the net annually available resource .The drawn amount of groundwater is estimated to be 210 billion cubic meters per year compared to 105 billion cubic meters in China and 100 billion cubic meters in US. Indian agriculture is sustained by groundwater. According

strain on the fresh groundwater supplies has triggered more saltwater intrusion to the Biscayne aquifer. Saltwater intrusion has been one the main contaminant that continues to endanger the Biscayne aquifer. It has occurred as a result of the followings: the over-pumping by wells, the construction of drainage canals, and the lowering of the water table by drought. Ongoing efforts by South Florida water agencies to protect the aquifer from saltwater intrusion include groundwater monitoring, water management

the southern highlands of the Uweinat area. Late Quaternary recharge appears to affect the shallow aquifer horizons only (Paterson et al., 2005). Krepton-81 ages (Sturchio et al., 2004) show also a progressive increase with distance to the east and north from the Dakhla Oasis, their spatial distribution indicates relatively high flow velocities (~1 m/yr–3.17×10-8 m/s) from Dakhla (210 kyr) toward Farafra (330 kyr) along the groundwater flow, and low velocities (~0.2 m/yr–6.34× 10-9 m/s) from Dakhla

103 km2) in Sudan and Chad to estimate the natural recharge rate. The Nubian Sandstone Aquifer System (NSAS) is shared by Egypt, Libya, Chad, and Sudan, and is one of the largest (area: ~ 2 × 106 km2) groundwater systems in the world. Findings from the study include: (1) average annual precipitation was estimated at 77.5 mm (65 km3); (2) recharge rate was estimated at 2.79±0.99 km3/yr; given the annual extraction rate (~0.407±0.10 km3), recharge rate amounted to 3.2±1.00 km3/yr; and (3) the east-west