News and Articles

The report presents regional flood frequency curves developed by fitting L-moment based GEV distribution to annual maximum peak flood data of small to medium sized catchments of the seven hydrometeorological sub-zones of zone 3 and combined zone 3 of India. The effect of regional heterogeneity is studied by comparing the growth factors of various sub-zones and combined zone 3. The flood frequency curves based on probability weighted moment (PWM) approach have been compared with the flood frequency curves based on L moment approach.

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 study, which is a part of the representative basin studies, attempts to do a morphometric analysis of the Suddagedda basin of Andhra Pradesh. The linear, areal and relief aspects pertaining to morphology are studied. In ungauged basins and basins with very little hydrological data, the study of geomorphologic characteristics is important as these can be related with the hydrological characteristics of the basin and thus provide a simple way to understand the hydrologic behavior of various basins.

The study uses Water Erosion Prediction Project (WEPP) model of the United States Department of Agriculture (USDA) to simulate the flow and erosion processes in Sallopat watershed of Mahi river basin in Banswara, Rajasthan. The WEPP model is a distributed, continuous, small agricultural watershed erosion model. It can simulate the effects of management practices and land use changes on the spatial and temporal variability of the erosion processes within a watershed system. The major features of this model are the ability to –

• Delineate areas of detachment and deposition on a hill slope or along a channel reach
• Account for the effects of management and land use changes on the erosion process
• Account for the effects of backwater on detachment, transport and deposition processes within channels

The study develops a regional hydrological model for estimating flow characteristics at ungauged sites of Narmada basin using climatological, hydrological and morphological variables. The term low flow is broadly used to describe stream flows that are significantly below average or below normal flow levels.

The study attempts water quality monitoring of Mansar lake to detect the various water quality parameters. The lake water conditions were monitored by collecting water samples from different depths to determine the spatial and temporal variations.

The study attempts to understand the status of groundwater quality in Belgaum city. In groundwater assessment studies, evaluation of the quality of groundwater is as important as the quantity because the usability of groundwater available is determined by its chemical, physical and bacteriological properties.

The study attempts to develop an in-depth understanding of the behavior of open wells in the region through sensitivity analysis of the aquifer parameters and its method of pumping test design. The estimation of groundwater balance and flow paths requires appropriate aquifer parameters, representing the study domain.

The report deals with the results of a study on seasonal changes in groundwater hydrochemistry of Kakinada town of Andhra Pradesh. A total of 29 dug wells and 16 filter points were selected for assessing the hydrochemistry. The monthly groundwater levels measured form the wells indicated that they are different for wells located above and below the Mean Sea Level (MSL).

The study deals with the detection of trace elements – Cu, Co, Cd, Zn, Fe, Mn, Ni and Pb along with pH and ORP in the groundwater of Guwahati and its adjacent areas. Toxicity of a metal depends on its concentration, which adversely affects any biological activity. Almost all the metals are toxic at higher concentrations, few in low concentrations and few others even in trace like As, Pb, Hg, Cd etc. The presence of such metals in groundwater is a subject of concern. Groundwater that contains higher amount of metals affects public health to a great extent when it is used for drinking and domestic purposes.