设计和工程概念必须与一个国家的建造、运营、维修和融资能力相匹配。孟加拉国吉大港设计了一座低技术、劳动密集型水处理厂。它结合使用当地材料和劳动力，限制能源使用，减少进口技术，同时通常符合世界卫生组织允许的最高准则。文中介绍了哈尔达河莫哈拉工厂的设计细节，包括水质和工艺装置。其中包括原水泵站、沉沙池、快速混合器、澄清器、过滤器、化学品和污泥处理。包括表格、数字。

Design and engineering concepts must match a nation's ability to build, operate, repair, and finance. A low-technology, labor-intensive water treatment plant was designed for Chittagong, Bangladesh. It incorporates the use of local materials and labor, limits energy use, and reduces imported technology while generally meeting World Health Organization maximum permissible guidelines. The specifics of designing the Mohara plant on the Halda River are covered, including water quality and process units. These include the raw water pump station, desilting basins, rapid mixer, clarifiers, filters, chemicals, and sludge handling. Includes tables, figures.