Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/11836
Authors: Suresh, S.
Issue Date: 1997
Abstract: The current irrigational practices in many areas of India are resulting in rise-of the water table and large areas are threatened by water logging and soil salinity. Water logging coupled with soil salinity contributes to progressive reduction in the agricultural production. In the canal irrigated areas, there is usually an excess of water availability in the head and middle reaches and shortage of water in the tailend areas which also affects agricultural production adversely. In order to sustain productivity and provide additional supply of water to the tailend areas, it becomes essential to develop groundwater resources of the command area and use the same in conjunction with surface water. In the Hirakud canal Command Area (HCA) of Orissa, the canal irrigation system since 1960 has resulted in the continuous rise of watertable and large areas have become water logged. In the present study, the shallow watertable areas have been identified for groundwater development in parts of Hirakud command for the mitigation of waterlogging condition by using an Aquifer response model. The major part-of the study area is underlain by hard crystalline rocks. The most common rock types are granite and granitic gneisses occupying more than 90 % of the area. The top soil is underlain by weathered residuum of average thickness of 15 m, forming top phreatic aquifer. The fractured rock extending to a depth of 70 m underlies the top phreatic aquifer. One metre thick intermediate zone between the overburden and the fractured zone has been treated as a second layer with high permeability and storage coefficient. Thus a three layer model has been considered for the study area. An initial exercise of water balance study has been carried out for the whole study area as a lumped model for ascertaining the different components. The results of the validated lumped model have been utilized to incorporate the variation in the parameters in the distributed model. A grid of 11 X 18 cells has been designed for the study and a three dimensional modular finite difference groundwater flow model (MODFLOW) has been used for the simulation studies. Subsequently the different scenarios of groundwater development plans to lower the water table in the areas, either prone to water logging or already waterlogged, have been studied in the calibrated and validated model. The area characterized by shallow water table (< 2.0 m) in the month of June for the present scenario is in the order of 200 The water balance study for the distributed model shows that the area is characterized by an annual recharge of 1537.97 mcm while the annual draft and net river leakage are 7.21 mcm and -640.26 mcm respectively. This results in the building up of storage in the order of 99.61 mcm. In the recommended scenario (No: III), the recharge at the end of first year of predictive simulation works out to be 1598.76 mcm, while the draft and net river leakage amount to 369.16 mcm and -499.92 mcm respectively, with a change in storage of 33.87 mcm. The area of shallow watertable is reduced to 170 at the end of third year. Keeping in view the reduction in the area characterized by shallow watertable, building up of storage and river leakage, the scenario III has been recommended for further detailed consideration for selection of conjunctive use plan.
Other Identifiers: M.Tech
Research Supervisor/ Guide: Seethapathi, P. V.
Singhal, D. C.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' THESES (Hydrology)

Files in This Item:
File Description SizeFormat 
HYD247903.pdf3.46 MBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.