Evaluation model of LID facilities based on the influence of water resource value

Low-impact development (LID) facilities can not only effectively control rainwater runoff and its pollution, but also enhance the value of urban water resources in water systems. Current studies usually pay more attention to the effect of pollution control indicators, and there are few reports on the evaluation of LID facilities from the perspective of enhancing the value of water resources. Taking the Maluan Bay area of Haicang, Xiamen as an example, an evaluation model of water resource value was established based on the SWMM software and the pollution loss model. From the perspective of economic quantification, the value of water resources brought by three types of LID facilities, such as green roofs, permeable pavement and infiltration gallery, under rainfall conditions in different recurrence intervals was simulated and calculated. In the single rainfall event of 1-10a recurrence interval, the water resource value brought by the green roofs is 679.14-787.49 RMB/hm(2), the permeable pavement is 79.07-383.37 RMB/hm(2) and the infiltration gallery is 825.45-1,021.79 RMB/hm(2). The results show that the value of water resources brought by the three types of LID facilities decreases with the increase of rainfall recurrence interval.