Urban drainage system -linear drainage channel

With the acceleration of urbanization in our country, serious waterlogging disasters have occurred in some areas. In July 2021, Henan Province encountered extremely heavy rains, causing severe waterlogging in the city and subway flooding, resulting in huge economic losses and casualties.In August 2020, Sichuan Province suffered continuous heavy rainfall, which damaged river bank protections, flooded urban roads, and paralyzed traffic, which greatly affected the lives of local residents. These waterlogging problems are the result of the continuous expansion of urban construction, the continuous increase of building area, and the reduction of green area. They are also a reflection of the insufficient drainage capacity of the urban drainage system.

In recent years, sponge city construction has become one of the important tasks of urban construction and transformation.

In the construction requirements of sponge cities, it is mentioned that gray and green should be combined, low-impact development facilities should be combined with municipal drainage systems, and low-impact development facilities should be used to reuse rainwater when rainfall is small,rainwater on the road surface is collected and drained in time through the municipal drainage system when rainfall is heavy. The problem of urban waterlogging is not only reflected in the limited green area of the city, but also in the insufficient drainage capacity of the city’s own municipal drainage system.

As an important part of the urban drainage system, drainage channels play the role of collecting rainwater. The slope and materials adopted in the design of drainage channels can play a diversion role, speed up the drainage of rainwater, and effectively reduce the occurrence of urban waterlogging.Drainage channels can be divided into point trench drains and linear trench drains according to their layout. Point drains are rainwater inlets set at regular intervals on roads and sidewalks to collect and discharge rainwater. Linear drains are continuous rainwater outlets arranged along roads and sidewalks, connecting all rainwater outlets into a line. They have the function of quickly collecting water from the ground, allowing ground rainwater to be reasonably distributed to the urban drainage pipe network and flow out.

In the past urban planning and design, due to cost considerations, most urban areas used point trench drains.This kind of trench drain can meet small-scale drainage needs, and the design and construction are relatively simple.However, point trench drain s are prone to the problem of a certain drainage outlet being blocked, resulting in large-scale water accumulation in that drainage area. In addition, during continuous heavy rainfall, it is easy to cause water accumulation on the road due to insufficient drainage capacity, affecting people’s daily travel.

Therefore, with the development of cities, the original drainage system of the city needs to be transformed, and the point trench drains with limited drainage capacity are replaced by linear trench drains with higher drainage load.In addition to better drainage capacity, linear trench drains are designed to continuously arrange the drainage outlets into a line.The drainage stability of the linear trench drain is greatly improved, so that there will be no large area of water accumulation in the drainage area due to the blockage of a certain drainage outlet.At the same time, linear trench drains can be applied to more places. In addition to being suitable for municipal roads and sidewalks, they can also be used in airports, industrial parks and other places. Linear trench drains are modular systems composed of a variety of components. Module combinations of various specifications can meet various customer needs. Its unique design concept also creates more room for imagination for designers. It is a reliable and trustworthy product in the field of modern architecture and one of the important components of the modern urban drainage system.

Post time: Sep-26-2023