Rooftop Rainwater Harvesting for Recharging Shallow Groundwater

R. Rao, Giridhar Mvss
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引用次数: 8

Abstract

Water management is very critical for the growth and development of any economy, more so in a developing countries like India. However, resource is now under stress, because of excessive groundwater abstraction in the course of socioeconomic development and meeting increasing needs of growing population. Therefore, we need to conserve this precious resource while benefiting from it. The prime objective of the study is to identify the potentiality of rainwater for recharging shallow Groundwater in the Jawaharlal Nehru Technological University Hyderabad, Kukatpally campus. Normal annual rainfall in the study area is 821mm with unutilized non-committed surplus monsoon runoff. Artificial recharge of ground water through rooftop rainwater harvesting was done by constructing three recharge structures each with a capacity of 1,00,000 litres at different places in the study area with two recharge shafts for injecting rainwater into unconfined and confined aquifer system. Three measuring bore wells (piezometers) with a diameter of 6” were dug upto a depth of 30 m near the recharge structures for impact assessment studies. Water levels measured in the three bore wells on daily basis during the monsoon period were found to be 86.3, 90.2, 38.3 ft on 15th June 2012 before rainwater recharge and the corresponding water levels have been improved to 50.7, 56.5, 10.3 ft respectively on 1st October 2012 due to recharge of rainwater. A corresponding rise of 35.6, 33.7, 28.0 ft in groundwater levels has been registered indicating significant improvement of groundwater levels. Rainfall received during the years 2012 and 2013 is 774 and 1104 mm respectively. Total amount of surplus rainwater received during 2012 is 7,11,174, 8,93,849 and 4,74,814 liters recharged near Near Library, Near Girls Hostel and Near New IST respectively. Total amount of surplus rainwater received during 2013 is 10,13,563, 12,73,911 and 6,76,703 liters recharged near Near Library, Near Girls Hostel and Near New IST respectively. A total rainfall of 774 and 1104 mm has been found to be recorded and a total quantity of 50,44,013 liters of groundwater has been found to be recharged during the years 2012 and 2013 years respectively
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屋顶雨水收集补给浅层地下水
水资源管理对任何经济体的增长和发展都至关重要,对印度这样的发展中国家更是如此。然而,由于社会经济发展和人口增长对地下水的过度开采,水资源正处于紧张状态。因此,我们需要在受益的同时保护这一宝贵资源。该研究的主要目标是确定雨水补给海得拉巴贾瓦哈拉尔尼赫鲁理工大学库卡帕利校区浅层地下水的潜力。研究区年正常降雨量为821mm,剩余季风径流未被利用。通过屋顶雨水收集对地下水进行人工补给,在研究区域的不同地方建造了三个补给结构,每个补给结构的容量为10万升,并有两个补给井,将雨水注入无承压和承压含水层系统。在补给结构附近挖了3口直径为6英寸的测量井(压力计),深度为30米,用于影响评估研究。雨季期间,三口井每天测量的水位在2012年6月15日雨水补给前分别为86.3、90.2和38.3英尺,由于雨水补给,相应的水位在2012年10月1日分别提高到50.7、56.5和10.3英尺。地下水水位相应上升35.6英尺、33.7英尺和28.0英尺,表明地下水水位显著改善。2012年和2013年的降雨量分别为774毫米和1104毫米。2012年收集的剩余雨水总量分别为7,11,174,8,93,849和4,74,814升,分别在附近图书馆,附近女生宿舍和附近新科技学院附近进行补给。2013年接收的剩余雨水总量分别为10,13,563,12,73,911和6,76,703升,分别在附近图书馆,附近女生宿舍和附近新IST附近补给。2012年和2013年的总降雨量分别为774毫米和1104毫米,地下水补给总量分别为50,44,013升
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