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广西忻城县地处岩溶石山区,地表水源奇缺。工农业供水及城乡村人畜用水几乎全部靠提取地下水源解决。由于岩溶地下水出露的地形复杂,年内水量、水位变幅较大(雨季溢出地面,旱季一般埋深在20～50m左右),已开发利用的工程多采用拖车泵房、台阶人工移动、潜没泵房、浮船、升降等形式流动抽水,泵站运行管理复杂,工程造价高,供水耗能多,工程效益低,成本高、维修费用大,且很难选择到合适的设备型号,为了解决这些存在问题,在实践中忻城县根据当地地下水特点,选用深井潜水电泵直接固定在水下抽水,效果明显,配套动力减少30％,可节约土建投资及年运行管理费40％左右。从1988～1992年全县推广此经验,共建固定式地下抽水站11座161kW,灌溉面积823hm~2,山区人畜饮水工程8座66.5kW,解决饮水困难18600多人。1 工程投资与效益
Xincheng County, Guangxi is located in karst mountains, lack of surface water. Industrial and agricultural water supply and urban and rural areas, livestock and poultry water almost all by extracting groundwater sources to solve. Due to the complex terrain exposed by karst groundwater, the water volume and water level fluctuate greatly during the year (the rainy season overflows the ground and the dry season is generally buried at about 20-50m). In the projects that have been developed and utilized, trailers and pump houses are often used, and the steps are manually moved and submerged Pump house, floating boat, lifting and other forms of mobile pumping, pumping station operation and management complex, high project cost, water and energy consumption, low engineering efficiency, high cost, maintenance costs, and difficult to choose the right equipment model, in order to solve these There is a problem. In practice, Xincheng County selects deep submersible electric pumps to directly fix underwater pumping according to the characteristics of local groundwater. The effect is obvious. Supporting power is reduced by 30%, which can save about 40% of civil construction investment and annual operation and management fees. From 1988 to 1992, the county popularized this experience by jointly constructing 11 161kW underground fixed pumping stations, with an irrigation area of 823hm ~ 2 and 66.5kW of 8 drinking water projects in mountainous areas to solve the drinking water problem of over 18,600 people. 1 project investment and efficiency