Can the three-dimensional composite drainage network solve the problem of urban drainage?

With the continuous development of cities, urban drainage has become an increasingly serious problem. One of the main reasons for urban drainage problems is the large-scale land surface covering and underground pipe network construction in the process of urbanization, resulting in the inability of ground rainwater to infiltrate quickly, but to be discharged through the drainage system. In addition, climate change also has some impact on urban drainage, such as extreme rainfall and rising sea water. In order to solve the urban drainage problem, building a three-dimensional composite drainage network is a feasible option.

The three-dimensional composite drainage network is based on the underground drainage system and combines surface and underground rivers to form a three-dimensional composite drainage system. Compared with the traditional underground drainage system, the three-dimensional composite drainage network has the following advantages:

First, the three-dimensional composite drainage network can improve drainage efficiency. The traditional underground drainage system only drains water through underground pipes, and its drainage capacity is limited. The three-dimensional composite drainage network not only includes underground pipes, but also uses surface water systems and underground rivers for drainage. In this way, not only can the rainwater be effectively drained to the external waters, but also the flooding caused by the accumulation of rainwater can be reduced.

Secondly, the three-dimensional composite drainage network can improve the environmental quality of the city. The traditional underground drainage system only plays the role of drainage, but cannot purify the water body. The three-dimensional composite drainage network can purify rainwater by building facilities such as ecological wetlands and sedimentation tanks. This can not only reduce the extent of sewage entering the external waters, but also improve the water quality environment of the city.

Thirdly, the three-dimensional composite drainage network can improve the utilization rate of urban water resources. After traditional underground drainage systems discharge rainwater to outside waters, it cannot be reused. The three-dimensional composite drainage network can centrally treat the discharged rainwater and then reuse it. For example, treated rainwater can be used to irrigate green belts and urban farmland to improve water use efficiency.

In addition, the three-dimensional composite drainage network can also improve the city's ability to resist floods. With the effects of climate change, cities face increasingly frequent and extreme rainfall. Traditional underground drainage systems are difficult to cope with this situation. The three-dimensional composite drainage network can enhance the drainage capacity of the city through reasonable planning and design, and reduce the flood disaster caused by extreme rainfall in the city.

However, it is not easy to realize the construction of three-dimensional composite drainage network. First of all, it needs to invest a lot of money and human resources. The construction of three-dimensional composite drainage network requires large-scale civil engineering and construction of water conservancy facilities, which will require huge funds and technical support from engineers. Second, reasonable planning and design are required. Different cities have different drainage conditions and topography, so it is necessary to formulate corresponding planning and design schemes according to the actual situation. Finally, advocacy and education need to be strengthened. The three-dimensional composite drainage network is a relatively new technology, and it is necessary to strengthen publicity and education to all walks of life in order to improve the public's awareness and understanding of it.

In summary, the three-dimensional composite drainage network has the potential to solve urban drainage problems. It can improve drainage efficiency, improve environmental quality, improve water resource utilization and flood resistance. However, there are still some difficulties and challenges to realize the construction of three-dimensional composite drainage network. However, as long as there is sufficient financial and technical support, and with the joint efforts of all sectors of society, it is believed that the three-dimensional composite drainage network can make an important contribution to solving urban drainage problems.