THREE DIMENSIONAL STUDY OF POLLUTION IN GROUND WATER

Abstract

The borehole latrims, trenches, cesspools are a constant source of ground water pollution in rural areas in the country The soil. although, works as a good filter to remove bacteria to a certain exte rt., but the travel of bacteria beccmes alarmirg with high ground water velocities, when the pollution travels under gravity from these sources of pollution and joins tha ground vratar. This study incorporates the affects of the ground water velocity and sewage dispersion on the travel of bacterial pollution; on the forma-tion of the defensive organic mat averting pollution; and on the trends of the movement of chemical pollutantsi both in saturated and unsaturated Roorkee soils It is shown that the organic mat farmed move s in the direction of the ground water travel, Also it is found that in dry unsaturated soil,not only vertical movement of bacteria takes place but they also travel by radial dispersion, although to a lesser extent. With varying velocity and head of the ground water table below the pollution source (bore hole latrine ) the number of bacteria at a distarre 0,29(012) from the source have teen found to follow the trend N = A e when A = Constant, takirg into cons id erat ion the distance of the sampling point, Q = Discharge ,of ground water in cc/hour (under the source of pollution). h = height of ground water table above a datum line (under the source of pollution), Also the reduction in bacterial cumber with distarte have been found in Roorkee soil to be quite large in the first few feet of the soil which bc-,,corms gradual on further travel.