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Halesh Koti ¹, G. Ranganath ¹, H. N. Rajakumara ²

Affiliations
1 Mechanical Engineering Department, Adhiyamaan College of Engineering, Hosur 635 109, IN
2 Civil Engineering Department, R.R. Institute of Technology, Chikkabanavara, Bengaluru 560 090, IN

Abstract

In urban street canyons, external noise environment is a critical restriction to the opening of building windows for natural ventilation. The high external noise intensities are often used to substantiate the utilization of air conditioning systems in residential and commercial buildings. Therefore, a systematic method of examining the noise levels in urban street canyons is essential if the potential for natural ventilation is to be estimated. The noise levels and natural ventilation in urban street canyons depend on many aspects such as existing street dimensions, height of buildings and traffic density. A study has been carried out in a street to examine the variation in noise levels vertically in order to provide technical inputs on natural ventilation potential in urban street canyons. In this study, a number of noise measurements were made in urban street canyons of Bengaluru City, in residential and commercial areas with respect to aspect ratio (height of building/street width) changing from 1.0 to 4.0. With the help of measured data, a statistical model was developed. A linear regression analysis has been used. The model can be used to predict variation of noise level in vertical direction in urban street canyons. The variation of noise level is found to be a function of street width and height of a building above the street level, but the highest level of reduction is almost entirely a function of the aspect ratio. The rate of attenuation of foreground noise (L₁₀) is greater than the background noise (L₉₀) with height.

Keywords

Aspect Ratio, Noise Attenuation, Traffic Noise, Urban Street Canyon.

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L. Yeshodha ¹, T. Meenambal ², H. N. Rajakumara ³

Affiliations
1 Department of Civil Engineering, Adhiyamaan College of Engineering, Hosur, IN
2 Department of Civil Engineering, Govt. College of Technology, Coimbatore, T. N., IN
3 Department of Civil Engineering, Adhiyamaan College of Engineering, Hosur, Tamil Nadu, IN

Abstract

Groundwater abstraction is increasing day by day due to its increasing demand for various uses. Hosur Union of Krishnagiri district completely depends on groundwater for drinking purpose, since the surface water from Penniyar river is very limited. In the present study the assessment of groundwater quantity of this region is taken up, to ascertain the safe yield. The study reveals that the magnitude of annual rainfall and groundwater potential has a decreasing trend. The discharge rate is more than the recharge rate, leading to depletion of the groundwater level. The critical drawdown and safe yield have also been determined.

Keywords

Groundwater, Safe Yield, Hosur Union, Water Level Fluctuation.

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L. Yeshodha ¹, T. Meenambal ², H. N. Rajakumara ¹, S. Arunachalam ¹

Affiliations
1 Department of Civil Engineering, Adhiyamaan College of Engineering, Hosur-635 109, T.N., IN
2 Department of Civil Engineering, Government College of Technology, Coimbatore, T.N., IN

Abstract

This paper describes the study of groundwater fluctuation in the study area using remote sensing and GIS technique. In this study, Hosur Union of Krishnagiri district, Tamil Nadu, was selected as the study area. The base map of the study area was prepared by using Survey of India Toposheet at a scale of 1:50000. The groundwater fluctuations were studied for varying rainfall intensity. The analysis was carried out using spatial interpolation technique and Thiessen polygon method. For the analysis by spatial interpolation technique, the water level fluctuations for every 4 years interval were considered. In this technique, spline method was used to create the continuous surface for groundwater data. This method considers the distance between both unknown points and known points and measures the spatial correlations between two points so that the weights can change according to the spatial arrangements of samples. In Thiessen polygon method, Voronoi polygons were created so that every location within a polygon is closer to the sample point in that polygon than any other sample point. The Voronoi mapping tool provides a number of methods for assigning or calculating values to polygons. The results by both the methods indicated that the overall groundwater potential is low in the study area.

Keywords

Groundwater, Geospatial Modelling, Vornonoi Maps, Remote Sensing, Geographical Information System (GIS).

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L. Yeshodha ¹, T. Meenambal ², H. N. Rajakumara ¹

Affiliations
1 Department of Civil Engineering, Adhiyamann College of Engineering, Hosur-635 109, T.N., IN
2 Department of Civil Engineering, Government College of Technology, Coimbatore-641 013, T.N., IN

Abstract

The aim of the present study is to analyze physico-chemical parameters of groundwater. In this study, the Hosur block of Krishnagiri district has been selected as study area. The study area has categorized into four zones namely, agricultural, residential, industrial and institutional and five water samples were collected from each zone. The results of analysis were compared with, ISI, ICMR and WHO drinking water standards. The results show that the pH value, turbidity, TDS, fluoride and magnesium were within permissible limits in most of the samples. Calcium was found to be exceeding the permissible limits in many samples. Chlorides and iron were less than the permissible limits. Therefore, it can be concluded that the groundwater was not much contaminated and can be used for domestic purpose.

Keywords

Groundwater Quality, Water Standards, Permissible Limits, Hosur Block.

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