scholarly journals Background hydrogeologic data, water quality, and aquifer characteristics, western Allen County, Ohio

1999 ◽  
Keyword(s):  
Water Quality ◽  
Aquifer Characteristics ◽  
Allen County

scholarly journals Modelling of base flows by analysing the streamflow hydrograph

2012 ◽  
pp. 71-86
Author(s):  
Vesna Djukic ◽  
Vladislava Mihailovic
Keyword(s):  
Water Quality ◽  
Water Use ◽  
Local Minimum ◽  
Base Flow ◽  
Water Quality Protection ◽  
Small Streams ◽  
Aquifer Characteristics ◽  
Retention Characteristics ◽  
Increasing Demand ◽  
Base Flows

During dry periods, the flow of medium and small streams is significantly reduced and equal to groundwater flow. Since the base flows provide information about aquifer characteristics and retention characteristics of a basin, the possibilities of analysis and simulation of base flows gain importance under the conditions of intensive water use and the increasing demand for adequate water quality protection. In this paper, a model was established and used for the description of the principles governing the changes of base runoff on the basis of a streamflow hydrograph registered at the outlet of the basin on the example of the Kolubara basin up to the ?Valjevo? profile. Since the amount of base runoff from a basin cannot be measured, the results of base flows obtained using the local minimum method were adopted as the criterion for the comparison of the modelled values of base runoffs. The created model was applied for making simulations of the base runoff hydrograph during three characteristic years (rainy 1970, average 1985, and dry 1990). Deviations between the base flow values obtained using the established model and by applying the local minimum method are acceptable from the standpoint of general hydrological accuracy.

Use of bank filtration systems in the sub-tropical region of the lower Brahmaputra valley

2018 ◽  
Vol 15 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Medalson Ronghang ◽  
Pranjal Barman ◽  
Hemantajeet Medhi ◽  
Kamal Kumar Brahma ◽  
Arup Kumar Misra
Keyword(s):  
Water Quality ◽  
Iron Concentration ◽  
Quality Parameters ◽  
Climatic Conditions ◽  
Tropical Region ◽  
Water Supply Systems ◽  
Bank Filtration ◽  
River Bank ◽  
Well Yield ◽  
Aquifer Characteristics

Abstract River bank filtration (RBF) is a natural method of obtaining surface water from a river or lake via the sub-surface for domestic use. It has been intensively used worldwide to augment water supply systems for sustainability and can be operated under various conditions. Its energy requirements are comparatively lower than those of conventional water treatment systems. Field investigations were carried out at various locations in Kokrajhar district of Assam, India to assess groundwater quality and aquifer characteristics. The results suggest that major water quality parameters were within the Indian drinking water standards. The iron concentration exceeded the permissible maximum in more than 50% of samples from hand pumps, its concentration ranging between 0.33 and 3.50 mg/L. The pH was mostly in the range 5.4 to 7.4, suggesting that the water is slightly acidic. Aquifer and riverbed material collected along the banks of the Gaurang River were sieved, and classified as coarse silt to fine gravel, with gravel and sand predominant. The hydraulic conductivity, determined from the grain size distributions, were between 5 × 10−3 and 1.4 × 10−2 m/s, suggesting good aquifer permeability. The maximum safe well yield was estimated at 2,000 to 7,500 L/min, and the mean travel time at less than a week during the monsoon and more than 3 years under non-monsoon conditions. The aim of this paper is to demonstrate the RBF method for treating river water naturally under wet climatic conditions. The lower Brahmaputra basin is a unique physiographic setting with a powerful monsoon regime and a fragile geological base. The approach was to prepare a comparative study of water quality and aquifer characteristics with the present site and few active RBF sites.

Water quality dependence on the depth of the vadose zone in SAT-simulated soil columns

2005 ◽  
Vol 5 (1) ◽  
pp. 17-24 ◽  
Author(s):  
W. Cha ◽  
H. Choi ◽  
J. Kim ◽  
J. Cho
Keyword(s):  
Water Quality ◽  
Vadose Zone ◽  
Unsaturated Zone ◽  
Phosphate Removal ◽  
Soil Aquifer Treatment ◽  
Soil Columns ◽  
Nitrogen And Phosphorus ◽  
Aquifer Characteristics ◽  
Zone Depth ◽  
Flooding Period

Three soil aquifer treatment (SAT) columns were operated for five months to investigate the dependence of the treated water quality upon the depth of unsaturated vadose zone in terms of its organics, nitrogen and phosphorus contents. It was found that DOC removal was independent of the unsaturated vadose zone depth except during the initial flooding period when the effluent was injected into each column. From tests to study the nitrate profile, it was found that the pattern of nitrification was dependent on the depth of the unsaturated zone during the initial periods of SAT flooding. However, no further nitrification occurred at the end of the flooding since the injection of the effluent continued to provide a high loading concentration to the SAT columns. The lack of phosphate removal in this study indicates that its removal is more dependent upon the soils and aquifer characteristics than on the depth of unsaturated zone.

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