What Is a Flood Wall?

A concrete or masonry water-retaining structure, also known as a flood control wall, is used to ensure the flood prevention safety of towns and important industrial and mining enterprises, along rivers, coastal areas (partial sea ponds) or other special requirements. The flood wall serves the same purpose as the dike. Due to the city's major traffic routes along the river and densely-built buildings, sometimes due to the limitations of existing projects, or the needs of urban planning and development, or due to the limitation of land resources, flood walls have to be adopted to reduce land occupation and demolition.

Chinese name: Flood wall
Unit length: 2 meters

Cell board width: 0.2 m
Water blocking height: 1 meter

Classification of flood walls

There are two types of flood control walls: reinforced concrete walls and masonry walls.

Reinforced concrete flood wall

In areas where the foundation is weak, the bearing capacity is small or the ground conditions are limited, steel should be used.

Flood wall (2 photos)

Reinforced concrete wall (Figure 1). Underground burial depth is generally tens of centimeters to more than 1 meter according to experience. When the wall is high, design it to determine the burial depth to prevent deformation of the foundation and affect safety. The width and thickness of the foundation are determined by the calculation of the bearing capacity and stable strength of the foundation. Do anti-filtration or other forms of anti-filtration on the back toe to reduce osmotic pressure. Sometimes the back rafter is built with soil on the backwater surface (Figure 2), which increases the stability to a certain extent and is beneficial to temporary elevation and wave protection. In some cities, without affecting the safety of flood control, the greening and landscaping of flood control walls are used to add new scenery to the city. In order to improve the foundation, piles can be piled under the flood control wall to increase the stability of the foundation; for anti-seepage, the trench is often filled with clay or other anti-seepage bodies. Some are based on river conditions in front of the impervious body, and are used as barges or rock revetments to stabilize the embankment. Shanghai, China has a lot of experience in this area. In the flood prevention wall and sea pond project, there is a reinforced concrete curved anti-wave wall at the top of the wall, and some have a curved protective wall to prevent wind and waves. Since the 1990s, some cities have adopted empty box-type flood control walls, which not only have a solid structure but can further utilize the space inside the empty boxes. For example, Wuhu City, Anhui, Liuzhou City, Guangxi and other cities have built empty box-type multi-function flood walls.

Flood wall masonry wall

The use of masonry's own weight to achieve stability is generally divided into two types: one is made of concrete cuboid prefabricated parts (Figure 3); the other is made of block stone (Figure 4). Generally, the water front is vertical, and some designs have steep slopes, and the backwater slope is 1: 1. ^[1]

Flood Wall Features

The advantages of the flood control wall are mainly to save the land occupied by the building, which is conducive to the overall planning of the city. It forms a brand-new landscape with modern roads, overpasses, different floors and other buildings: it is also conducive to modern management. According to the needs of urban and transportation development, there will be more development of urban flood control walls.

Retaining wall is a new type of flood prevention product specially used for urban flood prevention. This product is especially suitable for urban streets, doorways, underground passageways, buildings and other places. It can also be used to raise hard dams to prevent flooding.

The product adopts a unit module design with good airtightness, which can form a variety of partition areas and quickly drain water. And the operation is simple, the installation is fast, the disassembly and assembly is convenient, and it can be reused, which is convenient for transportation and storage. Due to the large span of the unit's retaining wall, removing the retaining plate can be used as a vehicle passageway in an emergency. The flood control wall uses a special aluminum profile structure to replace the traditional method of using sandbags to stack water to reduce labor intensity. The water barrier is equipped with a special sealing device to ensure the reliability of the product's water resistance.

Structure: It is mainly composed of a base, a column, a baffle and a sealing device.

Flood wall (water retaining wall)

Technical parameters of general retaining wall:

Applicable base surface: concrete layer 80mm; asphalt pavement hard base layer 80mm

Design wind speed: 6.0m / s ^[2]