The modular rainwater collection system mainly consists of the following parts:

1. Rainwater filtering device: used for preliminary filtration and purification of rainwater to remove large particle impurities and suspended solids .

2. Rainwater storage device: used to store filtered rainwater, usually in the form of underground storage tanks or water towers.

3. Rainwater conveying pipe: used to convey filtered rainwater from the filtering device to the storage device, and at the same time convey the water in the storage device to the water-using area.

4. Overflow device: When the water level in the rainwater storage device reaches a certain height, the overflow device will automatically open and discharge excess rainwater into the municipal pipe network or natural water bodies.

5. Control system: used to control the operation of the rainwater collection system, including the switching of water pumps and motor units, the switching and switching of pipelines, and the monitoring and control of water levels.

6. Other auxiliary facilities: such as electrical facilities, intelligent control equipment, etc.