Deep Aquifers

The report looks at groundwater quality and presents the results of the chemical analysis of groundwater samples from openwells & borewells of Belgaum district. The study broadly covers these aspects - (i) groundwater quality evaluation of the district (ii) identification of groundwater quality problems in various parts of district (iii) classification of groundwater, and (iv) application of DRASTIC model for assessing the vulnerability to groundwater pollution.

The subsurface aquifer systems in Mahanadi delta region in Orissa (India) is largely characterized by two groups of freshwater aquifer systems, both of which are prone to saline water mixing/migration with time and development:

• The south western Mahanadi delta region is represented by unconfined to semi-confined freshwater aquifers underlained by brackish/saline aquifer systems with a diffusion boundary.
• The north eastern parts of Mahanadi delta is represented by deep freshwater confined aquifers overlained by brackish/saline water aquifers with aquitard/ aquiclude boundary.

The study provides an analysis of groundwater quality to identify probable pollution or contamination in coastal aquifers of Kakinada in Andhra Pradesh. Sampling surveys have been conducted in the months of May 99, August 99 and November 99 and about 186 water samples were collected from shallow wells, filter points, canal water and rainwater. The spatial and temporal variations of water quality parameters are presented in the report. 

In the present report a mathematical model has been developed for the study of stream aquifer interaction in multilayered system viz. a three-aquifer system, in which aquifers are separated by aquitards, considering varying stream-stage and vertical flow through aquitards. The model enables the computation of rates of recharge to the upper aquifer and exchanges of flow among aquifers along with the spatial and temporal distributions of piezometric heads in the aquifers.

The present study is in continuance with the earlier investigations made regarding the seepage from a surface water body in a multilayered aquifer system, wherein the influence of varying dimensions of a fractured-zone in a aquitard on the seepage from a source had been investigated. The objective is to examine the influence of a fractured-zone in a confining aquitard on the seepage from a surface water body. The issues covered include the influence of –

• The location with respect to the source of a fracture in the aquitard
• The position of the fractured aquitard at various depths in the aquifer system on the seepage from the source

In this study, the influence of a discontinuous aquitard on the seepage from a recharge source in a multilayered aquifer system, with the prescribed hydrogeological set-up, has been subjected to investigation.

The study on aquifer response modeling was undertaken for the southern channel command area of the Pennar delta canal system in Andhra Pradesh to understand the potential and dependability of groundwater supplies in the study area so that limited surface waters could be allocated to other uses or areas.

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.