(16)
where L MGAM is the infiltration depth calculated based on the MGAM model.
The hydraulic model parameters and infiltration depth values are listed in Table 3.
[Insert Table 3]
The average relative error was 10.41%, which indicates that the modified MGAM model effectively reflects the water infiltration depth of the loess area at different times within the bioretention facilities. The water infiltration depth of the facility increased as the initial water content at the site increased. The infiltration depth of water in the facility decreased as the saturated water content of the site increased. To prevent any adverse impact caused by the bioretention facilities to the loess foundation, compaction and other foundation treatment methods can be used to adjust the saturated water content at the site so as to control the influence range of rainwater infiltration.