81
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Changes
→Costs
简化修建方法，得到更优质成品的同时达到更安全的效果。使用衬砌或伸缩衬砌更加安全，并无需再使用重型起重设备吊起预制混凝土。衬砌使用一体式模具制成，模具中装满混凝土并靠在井身，而伸缩井身可以由弯道砖砌成地基环刀，必要时可加长。
===Costs费用===Hand-dug wells can provide a viable alternative to unhygienic, unprotected sources while avoiding the capital and maintenance costs associated with sophisticated drilling programmes or reticulated pumped systems. A range of lining types and water lifting technologies can be chosen to match the financial and management capacity of the participants in the water supply process.人工井可替代不卫生并且不受保护的水源，同时也不用花费与钻井或建设和维护网状泵系统相关的费用。在水供应过程中，可选择适合参与者财务和管理能力的衬砌类型和提水技术。
===Field experiences===