2.2.3 Test Conditions
The test process is shown in Fig. 5. The allowable ponding height of the bioretention facility is 20 cm; rainwater with ponding height greater than 20 cm is discharged through the overflow facility. The designed ponding time in this case is 24 h. The worst-case rainfall conditions were simulated with a constant water head of 20 cm for 24 h to observe the changes in water content at the site. An impervious membrane was placed at the bottom of each facility according to Liang et al.’s method (2020). The specific parameters of the test are listed in Table 2.
[Insert Figure 5]
[Insert Table 2]