Evaluation of groundwater potential and mapping using geospatial platform is crucial especially for semi-arid hard rock and coastal adjoining terrain to identify the zones of very good, good, moderate and poor groundwater potential. The Mambakkam mini watershed, Tamil Nadu (India) is situated towards the southern part of Chennai city. It is experiencing commercial development of groundwater in addition with escalating domestic and industrial demands. The present study is aimed to develop the mapping of groundwater potential zones for the selected urbanized watershed by using the remote sensing and geospatial techniques. Data like water level, water quality, rainfall, climatology and geophysical resistivity from various sources and satellite imageries have been used for this study to observe the changes on the sources of water resource system. The Inverse Distance Weighted (IDW) method was used for generating the thematic layers of rainfall, depth to bed rock, weathered rock, jointed rock and water levels. The generated village wise groundwater potential map has shown a vast spatial variability of ground water potential and the area that belongs to the “very good” potential category is quite less in the entire study area (12 %) which alarms the development of existing groundwater resource. The study concluded that considerable falling trend of groundwater level during pre-monsoon showing the alarming threat for further development. Thus the presented study identified the risk of groundwater development and provides guidelines to water resource mangers and village officials to recommend conservation and protection strategies against the uncontrolled commercial development especially on the identified poor groundwater potential zones.

中文翻译：

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使用地理空间技术对印度Kancheepuram区城市化的Mambakkam小型流域进行地下水潜力评估

评估地下水潜力并使用地理空间平台进行制图至关重要，特别是对于半干旱硬岩和沿海毗邻地形，以识别出地下水潜力非常好，良好，中等和较差的区域。Mambakkam迷你流域，泰米尔纳德邦（印度）位于金奈市南部。除家庭和工业需求不断增加外，它还在经历地下水的商业开发。本研究旨在通过遥感和地理空间技术为选定的城市化流域开发地下水潜在区的制图。来自各种来源和卫星图像的水位，水质，降雨，气候和地球物理电阻率等数据已用于本研究，以观察水资源系统来源的变化。反向距离加权（IDW）方法用于生成降雨，深度的岩层，风化的岩石，节理的岩石和水位的主题层。生成的村级明智的地下水潜力图显示了很大的地下水潜力，而在整个研究区域中，属于“非常好”潜力类别的区域却很少（12％），这警告了现有地下水资源的开发。 。研究得出结论，季风前地下水位有相当大的下降趋势，显示出进一步发展的惊人威胁。