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Water shortages and pollution in China are severe situations caused by rapid economic development and urbanization. The current water-conservation policies focus on implementing new technologies and management strategies at important spatial nodes while neglecting the significance of the response from the community and the public. In this paper, the elements that influence the public participation of water conservation within the community are analyzed and divided into three levels: the internal world elements of the residents, the different individual characters of the residents, and external world elements. Among these three levels, the internal world element level, including the desire to realize oneself, is crucial, as it will significantly strengthen an individual's participation activity once motivated. Based on Maslow's five-level theory of human needs, to establish a model of public participation in water-conservation communities, economic benefits, environmental improvement benefits, and the self-fulfilling satisfaction of participation will become the motivation for the model to function. In a new project, reclaimed water landscapes are established in the community, and eco-recreational activities with water-conservation themes are organized to guide and encourage public participation to foster water-conservation consciousness and to establish aging water-conservation guiding policies and implementation methods in the community.

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Winter cities have severe shortages of water resources. The effective classification and recycling of urban water resources that are available here are therefore significant for the sustainable utilization of water in winter cities, and snow is a potential water resource. In this research, the water quality of the snow and the pollutant composition in the vehicle roads of a typical residential community of Harbin are analyzed. It is concluded that there is a large amount of suspended substances, including chemical oxygen demand (COD), salt, ammonia, and oil in this snow. There are 27 main pollutants. The oily substances are dominated by hexadecane and are accompanied by toxic substances, including benzene, toluene, ethylbenzene, xylene (BTEX), and naphthalene. As snow is a carrier of pollutants, the underground space of the urban shallow green belt is proposed to be used to establish a snow-melting system that would integrate biological treatment devices. This method allows the year-round collection, storage, and utilization of rainwater for use in city planning and municipal technology, realizing multiple objectives and having a significant influence on further urban development.

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