The electric gate valve is in a normally closed state, and the rain is discharged from the overflow pipe first; when the overflow flow meter monitors the flow rate to 69.09 L/s (a 24-hour peak flow rate once a year), the electric gate opens, and the rainwater enters the regulation at the same time. Reservoir
Two rainfalls exceeding 20mm in August and September are selected as typical events. The basic characteristics of monitored rainfall events are as follows
The first rain: on August 12, the rainfall was 31.6mm. Except for the short 5-minute rainfall intensity of 4.2mm at 13:48, the rainfall in the rest of the time period was relatively average, and the 5-minute rainfall intensity did not exceed 1.0mm. The maximum flow rate of actual monitoring data is 32.5 L/s. During actual operation, the opening conditions set by the electric gate are not reached, and the regulating reservoir fails to enter water at the peak flow rate. Detailed comparison is shown in Figure 3-9
| Rain Date | Accumulated rainfall | Maximum rain intensity per minute |
| August 12, 2020 | 31.6 | 4.2 |
| September 29, 2020 | 21.6 | 1.6 |
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