Deep Aquifers

The IEEE Spectrum magazine, the flagship publication of the IEEE, the world's largest professional technology association, recently brought out a special report on Water vs Energy. The report contains three main sections - Thirsty Machines (Water, Energy and Industry), Uneasy Harvest (Water, Energy and Agriculture) and Tiny Test Beds (potential solutions).

The Uneasy Harvest section contains a special report - "Pumping Punjab Dry", on the depleting groundwater situation in Punjab, and how cheap energy is endangering India's food security.

"Where Water meets Watts", is a map of Water and Energy hot spots and bright spots.

The methods of pump test analysis reviewed in this report has been classified as traditional, computer based and new graphical. Quantitative data on hydraulic characteristics of aquifers including transmissivity and storativity are essential to the understanding and solution of aquifer problems and the proper evaluation and utilization of groundwater resources.

In this study, unsteady flow towards a fully penetrating well screened in both the aquifers of a two-aquifer system separated by an aquitard has been analyzed using numerical approach. Existence of multi-aquifer systems is common in a sedimentary basin.

In the study saltwater intrusion processes in a hypothetical homogenous and multi-layered coastal aquifer system are simulated using the United States Geological Survey (USGS) finite element model for saturated-unsaturated fluid density-dependent groundwater flow with energy transport of chemically reactive single species solute transport (SUTRA) for different boundary conditions and aquifer parameters.

The saltwater intrusion profiles for steady-state or transient conditions are obtained and analyzed. The effects of changes in the permeabilities of aquifers and aquitards, changes in the influx at the boundary, and changes in dispersivities in medium on the saltwater intrusion process are investigated.

The report summarizes aspects of the theory of anisotropic flow in porous media and reviews the methodology for computing hydraulic potentials in an unconfined aquifer system. An algorithm has been devised by applying appropriate transformation techniques for anisotropic domain.

Numerical experiments have been performed using the algorithm to compute hydraulic potentials in certain hypothetical anisotropic aquifer systems. A number of cases have been studied with different coefficients of anisotropy for the aquifer as well as the angle inclination of the bedding planes of the soil strata. The simulated hydraulic potentials in the anisotropic domain are established as equipotential lines in vertical sections.

The study presents a status report on hydrological problems of hard rock areas related to hydrological network design, groundwater quality, failure of open and borewells, regional flood formulae, groundwater balance studies, reservoir sedimentation, hydrological aspects of droughts, forest hydrology and drainage problems of black soil of the hard rock terrain.

Author: Hartman de Souza Art: Jessica Schnabel Content Courtesy: Himal Southasian

Where there is water, there is probably ore beneath.

Having trekked several times to Paikdev’s spring to gulp water pouring out of the moss-covered iron mouth, one would think the mysteries of the journey would fade. But, if anything, they have become more poignant – sitting here at this shrine to the snake deity of the Velip community in the village of Maina, in Goa’s Quepem District. It is here, amidst thousands of hectares of rolling forests, in the foothills of the Western Ghats, home to countless perennial springs and streams, wildlife and more, that a strange conglomeration of mining companies, politicians and real-estate developers are sharpening their collective sword. These activities were already afoot a year ago, with mining operations systematically destroying forests, because, as the government in Panjim stated at the time, the iron ore was needed by New Delhi to keep its nine-percent growth rate on track. This year, the message is no different.

This presentation deals with the problem of arsenic contaminated aquifers in the Gangetic belt of Bihar and the failure of the state government in tackling the crisis and calls for the establishment of a centralized knowledge & research hub with an understanding of the regional peculiarities to mitigate the crisis.

It traces the origin of arsenic crisis to the switch from use of surface water to groundwater. The health impacts of arsenic poisoning and the factors that aggravate arsenicosis are explained. A total of sixteen districts (fifty-seven blocks) in Bihar are affected by high levels of arsenic in groundwater, in trivalent form, which is a more toxic form of arsenic.

Use of rain water to recharge quickly the deep under ground water pockets

Present problem:

1. Due to urbanization, many a under ground water recharge/enrichment points have be closed/covered/blocked. So, % of water reaching the underground water pockets is reduced to a very great extent.
2. Bore wells are dug at a very large number to satisfy the increasing demand for water. Therefore, level of underground water table is going down alarmingly.
3. As  many the opportunities for the rain water to reach the underground level is blocked almost at all places, even with a little bit of rain, the water will run on the roads & cause artificial flood or water blocking at different points on roads or low laying areas of the Cities. Such floods are causing a lot of traffic jams/road mishaps.Rain water on the road is also damaging the durability of the TAR roads.

By using dried open wells, we can enrich the Underground water quickly.

In the good old days, open wells used to help the common man in fetching water for all purposes and specially the drinking water. Invasion of pump-sets and specially the deep bore wells have pulled the underground water indiscriminately. Therefore, the water table level of the underground water is continuously going down at a very alarming rate. This fall in the underground water table level has made many a very big and useful water wells dry up. Now they are not in use as people do depend on alternative source of water like bore well water or the tap water drawn from far off river water.