Changes

* Brikke, François, and Bredero, Maarten. [http://www.washdoc.info/docsearch/title/117705 Linking technology choice with operation and maintenance in the context of community water supply and sanitation: A reference document for planners and project staff] or 或([http://www.who.int/water_sanitation_health/hygiene/om/wsh9241562153/en/ alternative link其它链接]). World Health Organization and IRC Organization和IRC Water and Sanitation Centre. Geneva, Switzerland 2003.瑞士日内瓦 2003。* Maddrell S and Neal I, [http://www.samsamwater.com/library/Maddrell_and_Neal_2012_Sand_Dams_a_Practical_Guide_LR.pdf Sand dams: a Practical Guide沙坝：实用指南], Excellent Development, London伦敦. 2012.* Jacob H. Stern, Ph.D and Alvera Stern, Ed.D, et al. [http://c.ymcdn.com/sites/www.echocommunity.org/resource/collection/E66CDFDB-0A0D-4DDE-8AB1-74D9D8C3EDD4/Sand_Dams.pdf Water Harvesting Through Sand Dams通过沙坝收集水资源]. ECHO Technical Note. 2011