Evaluation of Site Suitability for Rain gardens in Sponge Cities Based on GIS

The Rain Garden is widely used in the construction of sponge cities due to its excellent rainwater management effects. A scientifically reasonable site selection is key to ensuring its effective benefits. In response to the current issues of relying on experience and low efficiency in the site selection of rain gardens in sponge cities, this paper constructs a suitability evaluation index system for the site selection of rain gardens based on the fuzzy analytic hierarchy process, considering the actual construction needs of rain gardens. By using ArcGIS for multi-criteria overlay analysis, a suitability evaluation model for rain garden site selection was established, and the suitability of rain garden site selection in the Fengdong New City area was evaluated. The evaluation results show that the total area available for construction in Fengdong New City is 52.25 km², accounting for 32.8% of the total study area, with suitable areas generally exhibiting characteristics of "more in the west and less in the east, distributed along rivers, and concentrated in the southwest."