Environmental impact analysis and evaluation of urban flood control projects?

What is the specific content of environmental impact analysis and evaluation of urban flood control projects? The following is the answer of Zhong Da Consulting Company.

1 Introduction

Urban flood control projects can improve the ability to resist natural disasters and reduce disaster losses by building dikes, strengthening and heightening urban flood control circles, and building and expanding drainage pumping stations, so as to promote the development of production, improve the ecological environment and improve the quality of life. Urban flood control projects have strong social public welfare, which can not only bring huge flood control, ecological and social benefits to the region, but also have a far-reaching impact on the natural ecological environment and social environment of the city and its surrounding areas, and its impact is often one of the main limiting factors for the feasibility of the project.

2 Environmental impact characteristics of urban flood control projects

2. 1 has remarkable social and environmental benefits and flood control economic benefits.

As a public welfare project, flood control project has no direct economic benefit. However, after the completion of the project, the flood control capacity of the city will be greatly improved, and the impact of urban waterlogging on industrial and agricultural production, residents' life, ecological environment and people's health will be reduced, which is conducive to the all-round development of social economy and has outstanding economic and social environmental benefits of flood control.

2.2 Urban flood control works are in harmony with the environment.

A city is the political, economic and cultural center of a region. In order to reflect the taste of an ecological city and a cultural city, it is required that the construction of flood control projects in waterfront cities should not only meet the requirements of flood control and drainage, but also meet the requirements of urban ecology and landscape as much as possible, so as to minimize the adverse impact on urban ecology and visual environment.

2.3 people-oriented, pay attention to the protection of ecological resources

Urban population is concentrated, and if the flood control project lacks respect for human ecology and research on urban personality, the landscape of the project area is monotonous and people cannot enjoy the natural interest. Sufficient buffer space should be reserved in the waterfront related to flood control project to avoid too dense buildings, and waterfront greening and leisure space should be set up in coordination with flood control project to reduce the adverse impact of the project on urban humanities and ecological environment.

2.4 Consider the particularity of urban flood control projects.

As a special geographical environment, urban dikes have their unique geological, hydrological and ecological conditions and special functional requirements. At the same time, in the process of urban development, infrastructure construction is complex, so it is necessary to solicit opinions from various departments, make unified coordination and comprehensive deployment, correctly handle the relationship between flood control projects and urban infrastructure, and ensure the correctness of flood control and urban construction.

Three engineering examples

Fengcheng city is located in the middle of Jiangxi Province, 60 kilometers away from Nanchang, the provincial capital. It is the main "gateway" from Nanchang to Gannan, and it is a closely linked industrial, mining and energy satellite city. Fengcheng city flood control comprehensive improvement project is located on the left bank of Fengcheng section of Ganjiang River, including flood dike project and regional waterlogging control project. Total length of newly-built dike 1 1.23km, flood control area 14.59km2, permanent project area of about 80.6hm2, total demolition area of about 16747 1.04 m2, and cultivated land protection1/kloc.

3. 1 environmental impact analysis

3. 1. 1 water environment

(1) Influence on Hydrological Situation of River Reach

The flood dike is arranged on the floodplain on the left bank of Ganjiang River. After the operation of the project, it will have a certain impact on the hydrological situation and flood discharge in Fengcheng section of Ganjiang River. However, the joint operation of upstream Wan 'an and Xiajiang reservoirs and the application of Quangang flood storage project will not affect the normal flow and flood discharge safety of Fengcheng section of Ganjiang River.

(2) Impact on water quality of river reach

The influencing factors of water quality during construction include suspended solids, sand and gravel washing wastewater, alkaline wastewater, oily wastewater and domestic sewage. Because the earthwork excavation and backfilling of this project are arranged in the dry season, the construction activities are carried out without water, and the amount of soil entering the Ganjiang River with surface runoff is not large, and the suspended solids have little impact on the water quality of the Ganjiang River. Production and domestic wastewater can basically be reused, and the existing sewage treatment facilities have little treatment capacity and basically no discharge, which has no impact on the water environment.

This project is a pollution-free ecological project, which will not cause pollution during the operation period and will not cause pollution to the river environment.

(3) Impact on coastal water intake and coastal drainage

Dike construction is mainly carried out on land, and construction wastewater is not discharged into Ganjiang River, so dike construction will not affect the water quality of water intake in Fengcheng section of Ganjiang River. The water level of Ganjiang River has no obvious change before and after the project. After the completion of the project, there will be no obvious adverse impact on the water intake of each water intake.

3. 1.2 Atmospheric and acoustic environmental impact

(1) Ambient air

Environmental air pollution sources mainly come from dust and floating dust (TSP) produced by construction activities; Followed by COnstruction machinery fuel and waste gas (co, NOX, etc. ) is emitted by fuel during vehicle transportation. The project is built by the open Ganjiang River, with good atmospheric diffusion conditions. In addition, the amount of dust, floating dust and waste gas generated in the construction is small, which only has a certain impact on the ambient air quality in the construction site and transportation road 100m. Environmental air pollution disappears with the end of the project, and the impact is temporary.

(2) Acoustic environment

Construction noise mainly comes from concrete mixers, excavators, bulldozers, vibrators and other fixed machinery and transport vehicles, which has a negative impact on residents and construction personnel within 200 meters around the machinery. The construction noise disappears with the end of the project, and the impact is temporary.

3. 1.3 Demolition and resettlement

The demolition of this project covers an area of 8 13 households with 3,463 people. According to the specific conditions of the project and the wishes of the immigrants, the resettlement adopts the method of "nearby resettlement", with a total of four centralized resettlement sites. Immigrants have complete infrastructure and good living conditions, and their living conditions have been improved through compensation for demolition. Regional urbanization will inevitably lead to population agglomeration and industrialization, and public facilities and infrastructure will be further improved. In the long run, the resettlement method will not affect the family income level of immigrants, and the living standards of immigrants will rise steadily after the resumption of production.

3. 1.4 soil erosion

During the construction period, the surface area will be disturbed by 227. 15hm2, and the area of soil and water conservation facilities will be destroyed by 33.92hm2 The total amount of soil and water loss that may be caused by the project is 19572t, increasing the amount of soil and water loss by 18667t. It will bring adverse effects on the regional ecological environment. After the project is implemented, the slope protection project can reduce the collapse of coastal bank slope and rainwater erosion on slope surface, and reduce soil erosion.

3. 1.5 Social economy

Through the construction of urban flood control projects, the flood control standard in this area will be raised to once every 20 years, meeting the requirements of national flood control standards and urban flood control planning in fengcheng city. After the implementation of the project, it will improve the regional flood control and disaster relief capacity, improve the normal production and living order and people's living environment, avoid or reduce the impact of flood control and disaster relief on the normal production and life of society, promote the coordinated and sustainable development of society, economy and environment in urban dike protection areas, and thus enrich the people and strengthen the city.

3. 1.6 urban landscape

After the completion of the new dike, the beautification of the dike top and the greening of the waste rock pile can form a new landscape. The adverse effects are mainly manifested in the construction period. Setting up temporary buildings, taking soil from the yard, and abandoning soil and slag may cause visual adverse effects on the natural landscape, but this adverse effect is temporary and can be eliminated by taking measures after the project is completed. Engineering construction will not have a significant impact on the integrity of the regional landscape system.

3.2 conclusion of environmental impact assessment

After the implementation of the comprehensive flood control project in fengcheng city, a safe flood control system will be formed in Fengcheng city, which will protect and improve the regional ecological environment, reduce soil erosion in the project area, avoid the spread of snails and the epidemic of diseases that may be caused by floods, and create good basic conditions for the stable economic and social development in the western part of the city.

The results of environmental impact analysis show that the advantages of the project outweigh the disadvantages, and the potential adverse impact on the environment can be reduced by taking environmental protection and soil and water conservation measures. The environmental and social benefits of this project are enormous. Therefore, from the perspective of environmental analysis, the project is reasonable and feasible, and there are no environmental factors that restrict the implementation of the project.

4 conclusion

Although flood control works play an important role in urban disaster prevention and reduction, this promotion should not be at the expense of the environment. In the process of project planning, construction and operation, we should fully consider the coordination between flood control project and regional environment, systematically and objectively analyze the possible ecological environment problems, put forward the prevention and mitigation measures of adverse environmental impact, minimize the adverse environmental impact of project construction, coordinate the relationship between urban flood control, economic growth, social progress and environmental protection, and realize the coordinated development of urban flood control and ecological environment protection.

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