In urban drainage systems, rainwater pipes discharging into rivers are an important component. In order to prevent river water from flowing back into rainwater pipes, the following measures should be implemented:

1. Rainwater pipe design: When designing rainwater pipes, factors such as drainage capacity, downstream water level, turning radius, and burial depth should be considered. It is generally required that the downstream water level be lower than the outlet of the rainwater pipe to prevent the river from flowing back. At the same time, based on the actual situation on site, the material, specifications, and layout form of rainwater pipes should be reasonably selected. Rainwater pipes should have a certain burial depth to ensure that they will not be submerged in strong rainwater.

2. Medium sized built-in anti backflow device: To prevent river water from flowing back, a medium sized built-in anti backflow device should be installed at the drainage outlet of the rainwater pipe. The anti backflow device can prevent external water level from flowing back into the drainage pipeline when the external water level rises; And it will not affect the normal discharge of rainwater from the drainage pipeline, and has the characteristics of unmanned, no power required, and long service life.

3. Rainwater pump station: A rainwater pump station is installed downstream of the rainwater pipe to discharge water from the river. When selecting a rainwater pump, it is necessary to consider parameters such as flow rate and head, and select appropriate equipment according to actual needs. The rainwater pump station should have good operational performance, be able to operate stably under different working conditions, and be easy to maintain and manage.

4. Emission standards: To ensure the quality and environmental benefits of rainwater pipes discharging into rivers, corresponding emission standards need to be formulated. The standard should include requirements for discharge water quality, flow rate, water temperature, and harmful substance content. At the same time, corresponding regulatory mechanisms should be established to regularly monitor and manage the discharge of rainwater pipes into rivers, ensuring compliance with discharge standards.

5. Daily maintenance: To ensure the normal operation of the rainwater pipe drainage system, daily maintenance work is essential. It is necessary to clarify the maintenance responsibility subject, develop a detailed maintenance work plan, and regularly inspect and clean rainwater pipes. At the same time, regular inspections and maintenance should be carried out on rainwater pump stations to ensure their good operating condition.

6. Emergency response: In case of sudden floods or other natural disasters, it is necessary to carry out emergency response for rainwater pipes discharging into the river. An emergency plan should be developed to clarify emergency response measures and personnel responsibilities. During the emergency response process, it is necessary to closely monitor weather changes and water developments in order to adjust emergency strategies in a timely manner. In addition, coordination and communication with relevant departments should be strengthened to ensure timely support and handling in emergency situations.

In order to effectively prevent river water from flowing back into rainwater pipes, we need to take measures from multiple aspects. This includes reasonable design of rainwater pipes, installation of built-in anti backflow facilities in pipes, construction of rainwater pump stations, formulation of discharge standards, strengthening of daily maintenance, and development of emergency plans. By fully implementing these measures, we can ensure the safe and stable operation of the rainwater pipe drainage system, thereby making positive contributions to urban drainage and environmental protection.